115E0912.txt
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ADMINISTRATIEVE GEGEVENS & TECHNISCHE GEGEVENS
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Kaart nr.: 115E
PLAAT: ITTRE
Nr.: 0912 (VIII, c)
Type Boring: ontsluiting N.A.S. 2
Topografische kaart: 39/2
Uitgevoerd te: Ittre
Postnr.: 1460
Adres boorplaats: Along the Brussel-Charleroi canal, between
40590 m and 41110 m (distance along E-side
canal, from Charleroi to Brussels)
Opdrachtgever:
Boorfirma:
Boordatum/terreinopname:September 2001
Topografie: BGD, topo 1/10000
Stalen door:
Boormethode: ontsluiting
Lengte & doormeters:
Grondwaterstanden:
1ste maal:
Bij rust:
Tijdens pompen:
Debiet:
Waterzaaknr.:
Totale diepte:
Stalen bewaard: staalname en bewaring door auteur
Maaiveld / ref. peil: +- 80 m
X: 140750 (center)(min 140660 - max 140850)
Y: 148470 (center)(min 148240 - max 148660)
NIS code: 25044
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LITHOLOGISCHE BESCHRIJVING
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Short description of outcrop Northern Asquempont section 2 (BGD115E0912),
its immediate surroundings and its importance (fig. 1)
In the Lembeek area, in the southern part of the Cambrian core of the Brabant Massif, several
researchers observed steeply plunging folds (Vander Auwera, 1983; Verniers, unpub. data 1993,
André, pers. comm. 2000). Although their orientation markedly differs from the folds in the
Ordovican-Silurian formations in the southern part of the massif, Sintubin et al. (1998) demonstrated
that also these folds formed cogenetically with cleavage development. Largely based on aeromagnetic
data, Sintubin et al. (1998) attributed the apparent division in fold style between the Cambrian on the
one hand and the Ordovician-Silurian on the other hand, to dextral transpression along the Asquempont
lineament, wrongly attributed to the Asquempont fault. However, the observations of Debacker (2001)
and Debacker et al. (2003, 2004a) put strong doubt on the role of the Asquempont fault in dividing
both fold types. Firstly, the Asquempont fault (F8) does not coincide with the pronounced NW-SE-
trending aeromagnetic Asquempont lineament. Secondly, if the Asquempont fault (F8) pre-dates
cleavage development and folding, it would seem highly unlikely that F8 would be responsible for a
division between the two fold styles, both of which are considered cogenetic with cleavage
development. Thirdly, there is evidence for sub-horizontal to moderately plunging folds north of F8.
Small changes in bedding dip and the orientation of the cleavage/bedding intersection in the Cambrian
part of outcrops central Asquempont section 2 and Virginal railway section 1 suggest sub-horizontal to
moderately plunging folds. In addition, at the N-end of outcrop central Asquempont section 2, a
moderately NW-plunging antiformal step fold occurs (see above) and also Herbosch (pers. comm.
2000) observed a synformal step fold in the eastern part of the outcrops of "Rue de l'ancien canal"
(location: see 128E0753, fig. 2).
As such, it appears that, if outcropping, the transition between both fold types should be sought north
of the Asquempont fault, between the Asquempont area to the south and the Lembeek-Clabecq area to
the north. This area comprises two lithological units. The upper unit consists of greenish grey, soft,
porous mudstones of the Asquempont Member, Oisquercq Formation. The lower unit, also belonging
to the Oisquercq Formation, consists of dark purplish grey to blue claystones and mudstones of the
Ripain Member. Although also the Ripain Member contains zones of greenish grey mudstone, these
generally differ from the Asquempont Member by their hardness and low porosity (cf. Verniers et al.,
2001). Unfortunately, both members are characterised by an extreme homogeneity. To the author's
knowledge, prior to this study only a few bedding planes were ever observed in the Oisquercq
Formation in the Asquempont area (outcrop northern Asquempont section 3, Legros, 1991; cf. Lenoir,
1987).
Outcrop northern Asquempont section 2 (N.A.S. 2; BGD115E0912) contains the transition between the
Asquempont Member and the Ripain Member, as well as a transition zone between steeply plunging
(cf. Sintubin et al., 1998) and gently plunging folds, both being cogenetic to the same cleavage (fig. 2
& 3). The results of the data of northern Asquempont section 2, derived from Debacker (2001) and
presented herein, were published by Debacker et al. (2004b). In addition, because of the variable fold
orientations, and the extreme homogeneity of both members along outcrop northern Asquempont
section 2, this outcrop was used also for detailed magnetic fabric analyses, of which the results can be
found in Debacker et al. (2004c, 2005). Below, the observations of Debacker (2001) are given. In the
(rare) cases in which extra information is given resulting from observations from the period 2001-2005,
this is mentioned specifically.
1. Macroscopic observations
Cleavage/fold relationship
Cleavage, bedding and fracture data are shown in tables 1, 3 and 4. The transition between the
Asquempont Member and the Ripain Member, approximately 10 m wide, was found at the western end
of outcrop Ittre 1, the northern end of outcrop northern Asquempont section 2 (N.A.S. 2, ~41020 m, cf.
Legros, 1991; Hennebert & Eggermont, 2002) and its position could be deduced between 2 outcrops in
the abandoned railway at Virginal (between 7965 m and 7830 m). Within N.A.S. 2, the outcrop trace of
this transition suggests a relatively high strike and a steeply dipping to sub-vertical bedding. New
observations (period 2001-2005) indicate that, despite of the apparent width of the transition between
both members in terms of distance along the outcrop (seemingly ~10 m), the actual transition between
both members is only 1 to 2 metres wide. The apparently large width is entirely due to the relative
orientation of bedding, being subvertical, with a trend at very low angles to the trend of the outcrop. As
both members have different magnetic properties, magnetic fabric analyses allow pinpointing this
transition much better than standard lithological observations do (Debacker et al., 2004c, 2005). On the
basis of the magnetic properties, sample TD1010 is considered to be situated at or very close to the
transition between both members (see table 2 for location).
Along the Brussel-Charleroi canal, a gradual change in cleavage dip can be observed. Going from
south to north, cleavage dip changes from 50°NE in outcrop N.A.S. 1 and the southern parts of
outcrops N.A.S. 2 and 3, towards 80°NE in outcrop N.A.S. 4 and the northern parts of outcrop N.A.S.
2. Further north, in outcrops Oisquercq 1 to Oisquercq 4, cleavage remains steeply NE-dipping
(approximately 80°NE). Apart from outcrop Ittre 3, bedding is only observed in outcrops N.A.S. 2 and
3 and locally in outcrop Oisquercq 1.
Within outcrop N.A.S. 2 (table 3) bedding is frequently observed in outcrop and where field
observations do not allow determining bedding, cut oriented hand specimens often do. In outcrop,
bedding is locally revealed by sedimentary ripples and a thin volcanic intercalation, usually by less
obvious features such as cleavage refraction, vague changes in grain size and/or colour on fresh
fracture surfaces. Only occasionally do cut oriented hand specimens give away bedding directly by a
change in grain size. Usually, however, the darker colour of the grey clayey bands in the greenish grey
homogeneous mudstone is much easier to use. Often bedding can only be determined in outcrop after
linking planar surfaces with bedding determined on nearby situated cut hand specimens.
As appears from bedding measurements and the orientation of the cleavage/bedding intersection, sub-
horizontal to gently plunging fold hinges lines and associated intersection lineation take up a large part
of the section and dominate the southern part of the outcrop. The folds have gentle to open interlimb
angles, are asymmetric, with a SW-verging asymmetry and a step fold-like geometry. Because of their
analogy with the fold orientations in the Ordovician and Silurian, the gently plunging folds are labelled
type A folds (see Debacker, 2001). In between these zones of type A folds, zones with a moderately to
locally steeply NE-, E-, to SE-plunging cleavage/bedding intersection occur. Especially in the northern
part of the outcrop the intersection lineation is steeply plunging and clearly differs from the
cleavage/bedding intersection associated with the type A folds. Also the bedding measurements suggest
moderately to steeply SE-plunging folds. Unfortunately, however, individual fold hinges were not
observed. This is probably due to a combination of the relative orientation of the outcrop, the
homogeneity of the deposits, and the unfamiliarity with such bedding and fold orientations. Bedding in
the Ripain Member, in the northern part of the outcrop, where a steep intersection lineation
predominates, is even more difficult to observe than in the Asquempont Member. In these rocks,
bedding is often reflected by small chloritic bands. Although Legros (1991) argued that these have a
tectonic origin, parallelism between one of these bands and a nearby plane containing sedimentary
ripples suggests a parallelism to bedding of at least some of the chloritic bands. A further complication
is the apparent predominance of steeply NE-dipping bedding, resulting in a shortage of bedding
measurements at high angles to cleavage, necessary to constrain the fold hinge line attitude. If the
bedding poles indicative of a position in the fold hinge zones are not taken into account, the resulting
fold hinge line could have a moderate to gentle plunge, and one might tend to attribute the steep to
moderate intersection as a result of the low angle between bedding and cleavage (~ 20°). However,
stereographic manipulations, taking into account the measured angles between cleavage and bedding
and allowing for an angle of transection up to 020° show that the cleavage/bedding intersection indeed
reflects moderately to steeply plunging folds. For matters of convenience these folds will be termed
type B folds.
On the basis of the orientation of bedding, cleavage/bedding intersection and fold hinge lines outcrop
N.A.S. 2 can be divided into four large parts (> 50 m wide), two containing type A folds, and two of
which the data suggest type B folds. In between, smaller zones may be distinguished (e.g. between
40825 m and 40850 m). As becomes apparent from table 3, also the cleavage orientation seems to
change with fold type. The two large zones with moderately to steeply plunging fold hinge lines and
intersection lineation have slightly higher strike values than the two zones with type A folds. This
change in cleavage trend does not reflect the small intermediate zones. A pronounced anticlockwise
axial cleavage transection dominates this outcrop, apparently irrespective of fold type.
Fractures
In outcrops N.A.S. 2 steep fractures oriented at high angles to the structural trend often contain a thin
quartz infill, with an alignment parallel to the cleavage/fracture intersection. Although, throughout the
outcrop, the trend of the fractures remains fairly constant, a change in dip occurs. In the zones with
type A folds, fractures are sub-vertical to steeply E-dipping, whereas, in the zones where a moderately
to steeply E-plunging cleavage/bedding intersection occurs, the fractures are steeply to moderately W-
dipping (tables 1 & 4).
Faults and slip planes
Outcrop N.A.S. 2 contains several relatively wide zones of fracturation, post-dating cleavage
development. Their outcrop trace usually suggests a steep NW- to NNW-trending orientation. The
central parts of these fracturation zones often contain fine crush breccias. Several of these zones occur
around the transition between the zones with different fold styles (e.g. around 40830 m and between
40860 and 40870 m). At 40903 m, a 1 m-wide steeply S-dipping contractional kink band occurs, with a
down-throw towards the south, and a small normal fault running along the kink band boundary.
Although no striations are observed, the geometry of the overall structure suggests a predominantly
dip-slip displacement.
Many planar surfaces contain lineations resembling striations. Often, however, these can be shown to
represent an intersection lineation (e.g. intersection with cleavage). Only those lineations/striations of
which the orientation clearly deviates from an intersection lineation are considered. In several places
steeply NW-plunging striations occur on sub-vertical to moderately dipping bedding planes, with an
apparent down-throw towards the SE. Locally, sub-horizontal to gently NW-plunging striations occur
on bedding planes, with an unknown sense of movement (e.g. at 40835 m), as well as moderately E-
plunging striations on sub-vertical E-W-trending fractures (e.g. at 40974 m). In the northern part of the
outcrop several gently SE-plunging striations occur, with an apparently dextral sense of movement, on
sub-vertical planes with an orientation parallel to bedding.
2. Microscopic observations
Thin sections
Bedding in the Oisquercq Formation is even more difficult to observe in thin section than on cut hand
specimens. Only in two samples bedding was recognised on a microscopic scale. In both samples
(TD181, Asquempont Member and TD256, Ripain Member) bedding becomes apparent by means of a
gradual change in colour, related to an increase in amount of opaque material. Although
macroscopically changes in grain size have been observed in the Oisquercq Formation (e.g. TD123 in
outcrop Virginal railway section 1) the faint change in colour in these two samples is not associated
with a recognisable change in grain size. On a microscopic scale, the only lithological difference
observed between the Asquempont Member and the Ripain Member is the slightly higher amount of
opaque material in the latter member.
Both lithologies are very fine-grained: detrital quartz grains are rarely observed. Only locally, quartz
grains up to 25 microns are visible. A large amount of white mica is present, oriented parallel to the
cleavage. The cleavage, however, is poorly pronounced. In contrast to the cleavage in the other studied
lithologies (e.g. Rigenée Formation, Ittre Formation), usually of a disjunctive nature, with clear
pressure solution seams, there is no clear observation of a spaced cleavage in the rocks of the
Oisquercq Formation. Well-developed cleavage domains, marked by a, probably pressure solution-
related, higher concentration of opaque material, appear to be absent and white mica seems to occur
throughout the rock mass. Only occasionally do extremely vague cleavage-parallel anastomosing
alignments of darker material, resembling cleavage domains, become apparent. Where observed, the
estimated spacing of these is highly variable. In general, these cleavage domains are better developed
in the Ripain Member than in the Asquempont Member. Also the alignment of white mica is more
pronounced in the Ripain Member. This is compatible with the macroscopic cleavage appearance,
being more widely spaced and much less pronounced in the Asquempont Member and having a better
developed, slaty appearance in the Ripain Member.
As such, it seems that the cleavage in the Oisquercq Formation is a continuous to poorly developed
anastomosing spaced cleavage, the continuous nature reflected by white mica, the spaced nature by
vague cleavage domains with a gradual transition towards the microlithons. A spaced cleavage
becomes apparent around the chlorite-mica stacks. As in the other investigated lithologies, also here
stacks oriented parallel to cleavage as well as stacks oriented parallel to bedding occur. The latter,
having lower aspect ratios than the former, are often flanked by pressure solution seams. Their
orientation with respect to cleavage suggests a disjunctive cleavage nature.
We suggest that, on the scale of observation, the continuous to poorly developed disjunctive nature of
the cleavage is mainly a result of the fine-grained extremely homogeneous nature of these deposits.
Probably a strain partitioning occurs on a scale too small to be recognised by means of an optical
microscope. To a large extent this is confirmed by the pole figure goniometry results.
Pole figure goniometry
X-ray pole figure goniometry was performed by M. Sintubin at Katholieke Universiteit Leuven. For
information regarding the acquisition and interpretation of X-ray pole figure goniometry data, the
reader is referred to Sintubin (1994).
Three types of pole figure patterns can be distinguished. The first type is observed around the transition
zone between the Asquempont Member and the Ripain Member and in the Ripain Member (samples
TD279 and TD256). This type is characterised by a moderate preferred orientation for both white mica
and chlorite. The maxima coincide with the centre of the pole figure, which represents the cleavage
pole. The pole figure pattern essentially reflects a flattening fabric. In the case of sample TD256 the
pole figure pattern has a slightly orthorhombic symmetry, with a steeply plunging short axis. This short
axis may correspond to an intersection lineation between cleavage and bedding, which is compatible
with the macroscopically observed steeply plunging cleavage/bedding intersection. The small
differences between the relative amount of preferred orientation of chlorite and white mica in the one
sample with respect to the other sample, and the small difference in pole figure pattern may be a result
of lithology.
The second type, obtained from two samples of the Asquempont Member (TD186 and TD197), has a
weak to moderate preferred orientation, with rather orthorhombic pole figure patterns. The pole figure
maxima of white mica and chlorite approximately coincide. In the case of sample TD186, the degree of
preferred orientation of white mica is similar to that of chlorite, whereas in sample TD197, chlorite
shows a stronger preferred orientation than white mica. In both cases, the short axis of the orientation
distribution is steeply plunging. However, whereas in sample TD186, this is reflected by mica and, to a
lesser extent, by chlorite, this pattern is only reflected by the chlorite orientation distribution in sample
TD197. As macroscopically observed, the former sample has a moderate to steep cleavage/bedding
intersection, whereas the latter has a gently plunging intersection lineation. As suggested by Sintubin
(pers. comm. 2001) this second type of pole figure pattern possibly results from a small angle between
bedding and cleavage. The macroscopic data point to an angle between cleavage and bedding of 40° in
sample TD197 and 23 to 33° in sample TD186.
The third type differs from the other two types by its clear girdle pole figure pattern, a relatively weak
degree of preferred orientation, which is always higher for chlorite than for white mica and different
pole figure maxima for chlorite and for mica. The girdle pattern is generally more pronounced for mica
than for chlorite. All samples (TD185, TD272, TD192, TD276, TD195, TD196 and TD248) are taken
from the Asquempont Member. The girdle pattern and the different pole figure maxima of chlorite and
mica point to an intersection pole figure (cf. Sintubin, pers. comm. 2001). Compatible with the optical
observations, the mica pole figure maxima coincide with the cleavage pole, generally occupying a
central position within the pole figures. Therefore, probably the chlorite pole figure maxima coincide
with the bedding poles. This is confirmed by a comparison with the macroscopically determined angles
between bedding and cleavage (table 3). Large differences between chlorite and mica pole figure
maxima are obtained from samples in which the angle between bedding and cleavage varies between
74 and 79° (TD192, TD195, TD196). Those with moderate angles between both pole figure maxima
are obtained from samples TD276 and TD248, having cleavage/bedding angles of respectively 39 and
61°. Small to moderate angles are suggested for sample TD185, having a cleavage/bedding angle of
50°. A small angle between the chlorite and mica pole figure maxima is obtained for sample TD272,
having an angle between cleavage and bedding of only 17°. As such, these pole figure patterns seem
strongly influenced by the angle between cleavage and bedding. The short axes of the girdle should
correspond to the cleavage/bedding intersection lineation. Also this corresponds to the macroscopic
observations. Although, mainly because of small irregularities during sample preparation (e.g. a
slightly oblique cutting), care should be taken in using the apparent plunge values of the orientation
distribution short axes, these plunges generally match the plunge of the macroscopically determined
cleavage/bedding intersection lineation. Pole figure patterns of samples from zones with sub-horizontal
to gently plunging fold hinge lines and associated cleavage/bedding intersection have sub-horizontal
orientation distribution short axes (samples TD185, TD195, TD196), whereas those from zones with
moderately to steeply plunging folds (TD272, TD192) have plunging orientation distribution short
axes. In two samples (TD276, TD248) a difference is observed, the short axis having a slightly higher
plunge than that of the cleavage/bedding intersection determined in outcrop. Possibly this is due to
irregularities during sample preparation.
As such, the pole figure data largely confirm the presence of zones with a moderately to steeply
plunging intersection lineation in between zones with a sub-horizontal to gently plunging intersection
lineation. The degree of alignment is compatible with a poorly to moderately developed cleavage, in
general governed by white mica, acting on a bedding-parallel fabric usually reflected by chlorite.
Although thin sections often suggest a poorly developed continuous cleavage, the pole figure
goniometry data confirm our suggestion of a bimodal cleavage nature, with a crenulation or disjunctive
fabric on a sub-microscopic scale. Depending on lithology and relative orientation of bedding and
cleavage, the pole figure patterns may vary significantly.
References
DEBACKER, T.N. 2001. Palaeozoic deformation of the Brabant Massif within eastern Avalonia: how,
when and why? Unpublished Ph.D. thesis, Laboratorium voor Paleontologie, Universiteit Gent.
DEBACKER, T. N., HERBOSCH, A., SINTUBIN, M., VERNIERS, J. 2003. Palaeozoic deformation
history of the Asquempont-Virginal area (Brabant Massif, Belgium): large-scale slumping, low-angle
extentional detachment development (the Asquempont fault redefined) and normal faulting (the
Nieuwpoort-Asquempont fault zone). Memoirs of the Geological Survey of Belgium, 49, 1-30.
DEBACKER, T. N., HERBOSCH, A., VERNIERS, J., SINTUBIN, M. 2004a. Faults in the
Asquempont area, southern Brabant Massif, Belgium. Netherlands Journal of Geosciences/Geologie en
Mijnbouw, 83, 49-65.
DEBACKER, T. N., SINTUBIN, M., VERNIERS, J. 2004b. Transitional geometries between gently
plunging and steeply plunging folds: an example from the Lower Palaeozoic Brabant Massif, Anglo-
Brabant deformation belt, Belgium. Journal of the Geological Society, London, 161, 641-652.
DEBACKER, T. N., ROBION, P., SINTUBIN, M. 2004c. The anisotropy of magnetic susceptibility
(AMS) in low-grade, cleaved pelitic rocks: influence of cleavage/bedding angle and type and relative
orientation of magnetic carriers. In: Martin-Hernandez, F., Lüneburg, C.M., Aubourg, C. & Jackson,
M. (eds.) Magnetic Fabrics: Methods and Applications. Geological Society, London, Special
Publications, 238, 77-107.
DEBACKER, T. N., ROBION, P., SINTUBIN, M. 2005. Complexity of the anisotropy of magnetic
susceptibility in single-phase deformed, low-grade, cleaved Mudstone. Materials Science Forum.
HENNEBERT, M. & EGGERMONT, B. 2002. Carte Braine-le-Comte - Feluy n° 39/5-6, Carte
géologique de Wallonie, échelle 1/25000. Namur: Ministère de la Région Wallonne.
LEGROS, B. 1991. Etude structurale du Cambro-Ordovicien de la vallée de la Sennette (Massif du
Brabant) - Belgique. Unpublished M.Sc.-thesis, Université Catholique de Louvain.
LENOIR, J. L. 1987. Etude cartographique, pétrographique et palynologique de l'Ordovicien inférieur
du bassin de la Senne. Unpublished M.Sc. thesis Université Libre de Bruxelles.
SINTUBIN, M. 1994. Textures in shales and slates. In: Bunge, H. J., Siegensmund, S., Skrotski, W. &
Weber, K. (eds.) Textures of Geological Materials. DGM Informationsgesellschaft, Verlag, 221-229.
SINTUBIN, M., BRODKOM, F., LADURON, D. 1998. Cleavage-fold relationships in the Lower
Cambrian Tubize Group, southeast Anglo-Brabant Fold Belt (Lembeek, Belgium). Geological
Magazine, 135, 217-226.
VANDER AUWERA, J. 1983. Étude pétrographique, sédimentologique et géochimique de l'Assise de
Tubize (DV2) - Massif du Brabant - Belgique. Unpublished M.Sc. thesis, Université Libre de Bruxelles.
VERNIERS, J., HERBOSCH, A., VANGUESTAINE, M., GEUKENS, F., DELCAMBRE, B.
PINGOT, J.L., BELANGER, I., HENNEBERT, DEBACKER, T., SINTUBIN, M. & DE VOS, W.
2001. Cambrian-Ordovician-Silurian lithostratigraphical units (Belgium). Geologica Belgica, 4, 5-38
Timothy N. Debacker
September 2001
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STRATIGRAFISCHE INTERPRETATIE
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Oisquercq Formation, Asquempont Member to the south and Ripain Member to the north, based on
Hennebert & Eggermont (2002) and Verniers et al. (2001). The transition occurs around ~41020 m in a
seemingly ~10 m wide zone. However, the actual transition is only 1 to 2 m wide, the large apparent
width in outcrop (~10 m) being due to the steep bedding dip and the small difference in trend between
bedding and outcrop.
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AUTEUR Debacker T.N., September 2001, with some added observations from period 2001-2005
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Relevant documents for additional reading :
DEBACKER, T.N. 2001. Palaeozoic deformation of the Brabant Massif within eastern Avalonia: how,
when and why? Unpublished Ph.D. thesis, Laboratorium voor Paleontologie, Universiteit Gent.
DEBACKER, T. N., ROBION, P., SINTUBIN, M. 2004. The anisotropy of magnetic susceptibility
(AMS) in low-grade, cleaved pelitic rocks: influence of cleavage/bedding angle and type and relative
orientation of magnetic carriers. In: Martin-Hernandez, F., Lüneburg, C.M., Aubourg, C. & Jackson,
M. (eds.) Magnetic Fabrics: Methods and Applications. Geological Society, London, Special
Publications, 238, 77-107.
DEBACKER, T. N., SINTUBIN, M., VERNIERS, J. 2004. Transitional geometries between gently
plunging and steeply plunging folds: an example from the Lower Palaeozoic Brabant Massif, Anglo-
Brabant deformation belt, Belgium. Journal of the Geological Society, London, 161, 641-652.
VERNIERS, J., HERBOSCH, A., VANGUESTAINE, M., GEUKENS, F., DELCAMBRE, B.
PINGOT, J.L., BELANGER, I., HENNEBERT, DEBACKER, T., SINTUBIN, M. & DE VOS, W.
2001. Cambrian-Ordovician-Silurian lithostratigraphical units (Belgium). Geologica Belgica, 4, 5-38.
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BIJLAGEN
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Table 1: Orientation data of structural elements in outcrop northern
Asquempont section 2 (BGD115E0912).
Large 520 m-long outcrop situated along the E-side of the Brussel-Charleroi canal, just north of the
Asquempont bridge, between 40.590 and 41.110 km. The transition between the Asquempont Member
(SW) and the Ripain Member (NE) occurs in a seemingly ~10 m wide zone around 41.020 km (cf.
Hennebert & Eggermont, 2002). However, new observations (period 2001-2005) indicate that, despite
of the apparent width of the transition between both members in terms of distance along the outcrop,
the actual transition between both members is only 1 to 2 metres wide. The apparent 10 m-width is
entirely due to the relative orientation of bedding, being subvertical, with a trend at very low angles to
the trend of the outcrop. Sample TD1010 is considered situated at or very close to the transition (see
table 2). The importance of this outcrop is that it not only shows bedding in the Oisquercq Formation
(locally even with sedimentary ripples and a small volcanic intercalation), but also suggests the
presence of two different fold styles.
Orientations of planar elements (cleavage plane, bedding plane, fault plane,...) are given as strike/dip,
followed by the azimuth direction of the dip (e.g. 025/30 SE for a plane with strike 025°, dipping 30°
towards the SE) and orientations of linear elements (striation, intersection lineation,...) are given as
plunge/plunge direction (e.g. 30/025 for a line plunging 30° towards 025). In all cases, an azimuth
notation is used for strike and plunge direction going from 0° (N), over 180° (S) to 360° (N).
All outcrop measurements are taken from Debacker (2001). Samples (see also table 2) are from
Debacker (2001) and Debacker et al. (2004b, 2004c, cf. Debacker et al., 2005).
Bedding (S0; measured in outcrop)
40590-630 m:
1. 146/76SW
2. 141/90SW
3. 142/85SW
4. 141/86SW
5. 324/87NE
6. 144/82SW
7. 323/86NE
8. 144/89SW
9. 322/87NE
10. 140/86SW
11. 140/81SW
12. 138/84SW
13. 318/88NE
14. 135/88SW
15. 317/88NE
16. 314/89NE
17. 312/79NE
40630-673 m:
18. 132/74SW
19. 112/67S
20. 115/55SW
21. 116/57SW
22. 143/83SW
23. 310/88NE
24. 130/58SW
25. 126/53SW
26. 127/72SW
27. 133/75SW
28. 132/79SW
29. 133/62SW
30. 129/74SW
31. 130/71SW
32. 136/85SW
33. 303/81NE
34. 132/84SW
35. 138/54SW
36. 139/61SW
37. 134/69SW
38. 128/81SW
39. 135/83SW
40. 126/78SW
41. 126/74SW
42. 123/76SW
43. 123/67SW
44. 128/65SW
40673-685 m:
45. 123/66SW
46. 127/71SW
47. 119/62SW
48. 127/71SW
49. 124/73SW
50. 120/76SW
51. 126/54SW
52. 120/56SW
53. 120/50SW
54. 122/41SW
55. 126/38SW
56. 128/70SW
57. 123/67SW
58. 127/56SW
59. 128/50SW
60. 108/44S
40685-700 m:
61. 092/46S
62. 096/34S
63. 101/45S
64. 105/54S
65. 114/54SW
66. 131/35SW
67. 137/33SW
68. 130/36SW
69. 130/34SW
70. 114/48SW
71. 120/56SW
40700-725 m:
72. 119/32SW
73. 108/49S
74. 109/42S
75. 103/51S
76. 102/53S
77. 108/63S
78. 104/67S
79. 107/68S
80. 100/66S
81. 103/62S
82. 093/60S
83. 112/57S
84. 114/71SW
85. 114/72SW
86. 120/75SW
87. 120/76SW
88. 123/79SW
89. 121/63SW
90. 122/60SW
91. 121/61SW
92. 116/46SW
93. 116/49SW
94. 093/49S
95. 106/56S
96. 112/61S
97. 108/55S
40725-745 m:
98. 306/89NE
99. 125/88SW
100. 123/81SW
101. 130/88SW
102. 127/78SW
103. 126/81SW
104. 125/77SW
105. 130/82SW
106. 122/84SW
107. 123/76SW
108. 122/76SW
40825-840 m:
109. 046/26SE
110. 080/30S
111. 085/28S
112. 117/62SW
113. 098/54S
114. 106/62S
115. 103/65S
116. 106/53S
117. 105/73S
40890-910 m:
118. 131/63SW
119. 126/76SW
120. 128/70SW
121. 122/78SW
122. 119/76SW
123. 120/71SW
124. 154/28SW
125. 147/31SW
126. 142/34SW
127. 148/34SW
128. 150/31SW
129. 148/30SW
130. 160/36W
40910-935 m:
131. 126/22SW
132. 120/24SW
133. 124/36SW
134. 126/37SW
135. 126/35SW
136. 143/31SW
137. 138/36SW
138. 137/34SW
139. 146/28SW
140. 115/79SW
141. 115/78SW
142. 112/74S
143. 111/71S
144. 118/75SW
145. 123/72SW
146. 134/60SW
147. 132/64SW
148. 134/60SW
149. 132/56SW
150. 139/54SW
151. 115/62SW
152. 123/62SW
153. 122/60SW
154. 125/62SW
155. 118/60SW
156. 118/62SW
157. 124/60SW
158. 122/64SW
159. 125/54SW
160. 121/60SW
161. 123/50SW
162. 122/56SW
163. 133/47SW
164. 133/45SW
40935-960 m:
165. 120/66SW
166. 120/59SW
167. 122/59SW
168. 119/56SW
169. 116/57SW
170. 118/54SW
171. 125/70SW
172. 122/54SW
173. 118/69SW
174. 116/49SW
175. 116/49SW
40960-980 m:
176. 118/34SW
177. 102/49S
178. 104/47S
179. 113/53SW
180. 102/46S
181. 102/46S
182. 109/44S
183. 132/42SW
184. 123/48SW
185. 117/56SW
186. 119/49SW
187. 127/53SW
40980-41000 m:
188. 128/28SW
189. 148/50SW
190. 136/58SW
191. 133/66SW
192. 128/44SW
193. 131/42SW
194. 114/48SW
41040-050 m:
195. 324/76NE
196. 328/76NE
197. 319/82NE
198. 322/76NE
199. 310/88NE
Note : measurements 156, 157, 158, 169, 195 and 196 occurred on planes containing sedimentary ripples, measurement 181 on a
thin volcanic intercalation.
Bedding measured on oriented samples
See sample list in table 2 for detailed location of samples and corresponding bedding measurement.
40590-630 m:
144/82SW
147/80SW
315/90NE
40630-673 m:
132/73SW
40725-745 m:
126/77SW
40745-750 m:
332/55NE
296/82NE
40750-825 m:
072/45S
332/67NE
000/77E
328/82NE
326/80NE
327/87NE
318/80NE
15. 323/81NE
337/62NE
024/82SE
336/76NE
334/70NE
40825-840 m:
104/60S
40840-850 m:
051/43SE
019/50E
070/57S
40850-890 m:
125/73SW
125/69SW
40890-910 m:
122/73SW
148/18SW
40910-935 m:
112/37S
112/75S
133/61SW
40935-960 m:
115/59SW
113/48SW
40960-980 m:
108/45S
103/44S
106/45S
106/42S
111/38S
113/40SW
40980-41000 m:
139/50SW
134/58SW
127/73SW
111/64S
41000-020 m:
326/74NE
322/75NE
328/70NE
322/71NE
310/58NE
41020-41040 m:
329/75NE
326/68NE
311/66NE
322/68NE
41040-41050 m:
322/73NE
Cleavage (S1)
40590-630 m:
A. 293/46NE
B. 288/49N
C. 310/41NE
D. 303/48NE
E. 304/65NE
F. 300/47NE
G. 288/59N
H. 300/60NE
I. 302/65NE
J. 284/48N
K. 300/59NE
L. 309/69NE
M. 280/60N
N. 294/58NE
O. 288/48N
P. 298/55NE
Q. 300/69NE
R. 302/60NE
40630-673 m:
S. 287/60N
T. 300/57NE
U. 298/46NE
V. 297/36NE
W. 299/50NE
X. 289/68N
Y. 302/60NE
Z. 297/56NE
A'. 289/57N
B'. 304/66NE
C'. 303/72NE
D'. 281/70N
E'. 308/80NE
F'. 307/66NE
G'. 286/60N
H'. 295/50NE
I'. 312/43NE
J'. 298/66NE
K'. 322/70NE
L.' 274/51N
40673-685 m:
M'. 268/53N
N'. 274/60N
O'. 298/68NE
P'. 301/70NE
Q'. 296/76NE
R'. 272/54N
S'. 287/60N
T'. 295/67NE
U'. 285/62N
V'. 307/66NE
W'. 278/60N
X'. 279/56N
40685-700 m:
Y'. 314/49NE
Z'. 277/37N
A². 308/64NE
B². 278/31N
C². 293/54NE
D². 286/75N
E². 282/50N
F². 295/53NE
G². 323/67NE
H². 299/59NE
40700-725 m:
I². 286/44N
J². 277/52N
K². 290/53N
L². 270/44N
M². 285/53N
N². 285/64N
O². 286/50N
P². 270/42N
Q². 276/40N
R². 285/47N
S². 268/59N
T². 282/51N
U². 294/76NE
V². 271/58N
W². 277/55N
X². 290/69N
Y². 279/47N
Z². 288/50N
A³. 308/40NE
B³. 269/64N
40725-745 m:
C³. 298/66NE
D³. 293/47NE
E³. 302/74NE
F³. 297/64NE
G³. 298/72NE
H³. 292/61N
I³. 283/70N
40750-825 m:
J³. 331/69NE
K³. 321/54NE
L³. 315/64NE
M³. 316/61NE
N³. 307/69NE
O³. 308/58NE
P³. 306/68NE
Q³. 309/68NE
R³. 317/59NE
S³. 316/66NE
T³. 309/71NE
U³. 304/72NE
V³. 314/74NE
W³. 307/66NE
X³. 306/68NE
Y³. 318/72NE
Z³. 312/72NE
A4. 310/81NE
B4. 321/78NE
C4. 307/77NE
D4. 310/80NE
E4. 308/76NE
F4. 322/72NE
G4. 313/62NE
H4. 300/66NE
I4. 301/75NE
J4. 318/71NE
K4. 315/87NE
L4. 313/76NE
M4. 310/70NE
N4. 285/54N
O4. 306/82NE
P4. 310/72NE
Q4. 305/60NE
R4. 328/61NE
S4. 305/73NE
40825-840 m:
T4. 310/82NE
U4. 304/68NE
V4. 313/80NE
W4. 306/58NE
X4. 320/72EE
Y4. 299/70NE
Z4. 300/63NE
A5. 302/80NE
B5. 300/84NE
C5. 300/85NE
D5. 300/56NE
E5. 310/80NE
F5. 307/70NE
G5. 320/73NE
H5. 320/70NE
I5. 292/52N
J5. 312/74NE
40840-850 m:
K5. 285/67N
L5. 283/50N
M5. 310/75NE
N5. 303/79NE
O5. 302/71NE
P5. 291/61N
Q5. 277/60N
R5. 303/59NE
S5. 300/66NE
T5. 290/55N
40850-865 m:
U5. 290/70N
V5. 308/67NE
W5. 329/66NE
X5. 298/66NE
Y5. 309/63NE
Z5. 299/71NE
A6. 290/60N
B6. 304/82NE
40865-890 m:
C6. 315/66NE
D6. 314/72NE
E6. 299/70NE
F6. 310/59NE
G6. 318/74NE
H6. 295/60NE
I6. 302/74NE
40890-910 m:
J6. 280/55N
K6. 294/50NE
L6. 302/71NE
M6. 300/64NE
N6. 292/58N
O6. 320/73NE
P6. 295/61NE
Q6. 281/56N
R6. 286/63N
S6. 316/77NE
T6. 310/74NE
U6. 293/61NE
V6. 300/60NE
W6. 290/62N
40910-935 m:
X6. 303/62NE
Y6. 290/60N
Z6. 298/63NE
A7. 278/61N
B7. 299/64NE
C7. 305/66NE
D7. 301/79NE
E7. 305/62NE
F7. 299/78NE
G7. 300/60NE
H7. 296/60NE
I7. 305/70NE
J7. 292/56N
K7. 296/72NE
L7. 288/61N
M7. 301/59NE
N7. 293/64NE
O7. 281/68N
P7. 303/77NE
Q7. 296/66NE
R7. 285/62N
40935-960 m:
S7. 298/70NE
T7. 304/70NE
U7. 298/73NE
V7. 308/66NE
W7. 298/82NE
X7. 296/69NE
Y7. 292/76N
Z7. 284/60N
40960-980 m:
A8. 279/61N
B8. 286/78N
C8. 300/66NE
D8. 296/65NE
E8. 296/69NE
F8. 301/58NE
G8. 288/68N
H8. 286/71N
I8. 272/55N
J8. 298/69NE
K8. 286/54N
L8. 294/66NE
M8. 283/71N
N8. 292/63N
O8. 294/73NE
P8. 280/73N
Q8. 282/73N
R8. 292/63N
40980-41000 m:
S8. 287/68N
T8. 292/73N
U8. 294/72NE
V8. 303/79NE
W8. 301/71NE
X8. 291/83N
Y8. 298/78NE
Z8. 294/70NE
A9. 298/76NE
B9. 287/79N
C9. 287/67N
D9. 296/72NE
E9. 296/73NE
F9. 295/74NE
G9. 286/69N
41000-020 m:
H9. 284/58N
I9. 300/61NE
J9. 306/65NE
K9. 299/77NE
L9. 306/67NE
M9. 301/78NE
N9. 304/77NE
O9. 296/72NE
P9. 282/64N
Q9. 302/66NE
R9. 308/71NE
S9. 301/61NE
T9. 313/75NE
U9. 304/58NE
V9. 312/74NE
41020-040 m:
W9. 312/75NE
X9. 291/87N
Y9. 303/78NE
Z9. 306/72NE
A10.298/78NE
B10.300/81NE
C10.311/72NE
D10.308/76NE
E10.306/79NE
F10.300/67NE
G10.296/74NE
H10.291/72N
I10.298/78NE
J10.304/81NE
K10.302/79NE
L10.310/77NE
M10.304/85NE
41040-060 m:
N10.311/78NE
O10.307/73NE
P10.310/76NE
Q10.303/74NE
R10.302/81NE
S10.315/76NE
T10.297/74NE
U10.299/78NE
V10.304/82NE
W10.299/79NE
X10.315/72NE
Y10.307/81NE
Z10.296/63NE
A11.315/76NE
B11.301/72NE
C11.300/81NE
40060-080 m:
D11.306/81NE
E11.295/71NE
F11.300/82NE
G11.303/69NE
H11.299/76NE
I11.300/76NE
J11.305/74NE
K11.306/79NE
L11.304/83NE
M11.295/75NE
N11.307/73NE
O11.292/61N
P11.309/76NE
Q11.313/88NE
R11.302/80NE
S11.293/81NE
T11.293/78NE
U11.302/86NE
V11.301/88NE
40080-110 m:
W11.304/87NE
X11.296/79NE
Y11.302/80NE
Z11.308/80NE
A12.305/90NE
B12.305/86NE
C12.303/72NE
D12.302/90NE
E12.303/80NE
F12.304/82NE
G12.302/78NE
H12.303/88NE
I12.306/85NE
J12.308/86NE
K12.300/86NE
L12.301/81NE
M12.292/81N
N12.306/90NE
O12.288/75N
P12.303/86NE
Cleavage/bedding intersection (measured in outcrop)
40590-630 m:
39/315
32/321
36/318
36/318
28/326
38/318
54/328
46/323
43/325
36/317
44/311
30/315
34/319
33/314
46/319
41/315
40/321
40630-673 m:
20/305
14/291
38/318
25/309
21/300
25/306
22/301
18/304
15/305
31/308
08/316
19/313
26/300
18/301
09/299
15/301
40673-685 m:
13/302
13/292
26/297
11/301
03/299
22/286
14/293
14/303
08/299
12/299
40685-40700 m:
09/102
08/107
07/106
02/107
09/289
12/292
14/302
10/298
14/289
05/293
04/300
40700-725 m:
07/292
04/289
01/289
06/106
01/104
01/104
05/109
02/101
06/280
05/289
21/294
14/297
09/296
03/118
06/294
02/101
01/104
10/122
40725-745 m:
19/304
16/300
23/302
17/303
11/302
13/301
17/299
11/299
40890-910 m:
20/287
18/294
18/293
40910-935 m:
04/301
09/306
14/305
04/116
04/294
03/113
05/301
16/304
21/297
13/294
07/301
40935-960 m:
05/298
15/292
15/287
14/300
09/294
13/285
40960-980 m:
04/106
04/116
05/110
00/284
02/287
11/297
13/293
01/117
40980-41000 m:
11/288
25/301
11/295
04/288
Quartz-infilled fractures
40590-745 m:
055/52SE
048/60SE
188/79W
183/76W
40840-850 m:
204/70NW
200/77W
204/70NW
199/74W
210/68NW
209/81NW
200/74W
40890-41000 m:
045/55SE
032/45SE
023/55SE
019/59E
030/51SE
020/75E
021/70E
018/69E
020/68E
024/65SE
028/56SE
022/66E
025/64SE
187/73W
019/89E
018/90E
017/89E
018/90E
191/69W
193/68W
189/70W
193/85W
195/88W
190/70W
188/71W
190/73W
41000-110 m:
195/66W
188/58W
187/59W
194/60W
194/61W
183/57W
195/61W
194/62W
200/79W
204/54NW
183/62W
194/71W
192/64W
188/63W
Slip planes
Of the many linear elements encountered along the section, only those are given which are
geometrically proven not to be an intersection lineation with the cleavage. Where known, the sense of
movement is added (N: normal, R: reverse, D: dextral, S: sinistral, or combinations of these in the case
of oblique slip).
40619.5m,1.5m:
on S0 14:
67/315
72/315
40650 m:
on 300/69NE:
66/359 R
40656 m:
on S0 31:
64/265
40787 m, 5.5 m:
on 322/88NE:
72/328
on 138/86SW:
69/308
on 144/76SW:
67/278
40834.5 m, 4 m:
on 115:
07/280
40834.5m, 3 m:
on 116:
09/279
40974 m, 6 m:
on 272/87N:
39/090
on 278/88N:
50/096
on 273/88N:
43/091
40021.5, 1.5 m:
on 150/90SW:
30/150 D
on 148/88SW:
29/149 D
40026m, 1.5 m:
on 334/76NE:
27/147 D
on 334/83NE:
31/150 D
40025.5 m, 2 m:
on 325/68NE:
49/352
on 330/70NE:
48/354 N/S
40032 m, 2.5 m:
on 139/88SW:
81/307 N
40031.5, 2.5 m:
on 130/89SW:
59/308 N/D
on 134/90SW:
67/314 N/D
40619.5 m, 1.5 m: distance along the canal, followed by the height in outcrop.
on 115: measured on bedding plane 115
Kink band
A 0.5 to 1 m wide steeply S-dipping contractional kink band occurs at 40.9035 km, with a downthrow
towards the south. See also cleavage measurements in zone 40890 - 40910 m for the cleavage
orientations to the north (S1 N-side) and south (S1 S-side) of this structure. S1 inside means cleavage
measured inside the kink band. A small fault runs along the northern kink band boundary.
S1 N-side:
Ak. 298/69NE
Bk. 288/72N
Ck. 282/44N
S1 S-side:
Dk. 303/54NE
Ek. 299/67NE
S1 inside:
Fk. 039/48SE
Gk. 039/38SE
Hk. 072/46S
Ik. 053/55SE
Jk. 030/45SE
k.b.boundary*:
1k. 094/81S
2k. 090/84S
3k. 080/77S
4k. 064/69SE
5k. 065/72SE
6k. 066/72SE
bending S1*:
Kk. 295/67NE
Lk. 283/29N
Mk. 067/39SE
Nk. 058/45SE
*: measured on the northern, faulted, kink band boundary, where locally also a small bending of the cleavage can be observed,
related to the overall structure
Sedimentary ripples at 40.932 km, 4 m high
20/294
21/289
14/295
27/289
12/294
Samples
TD180
TD181
TD184
TD185
TD186
TD187
TD188
TD189
TD190*
TD191
TD192
TD193
TD194
TD195
TD196
TD197
TD198
TD199
TD240
TD241
TD242
TD243
TD244
TD245
TD246
TD247
TD248
TD249
TD250
TD251
TD252
TD253
TD254
TD255
TD256
TD257
TD258
TD259*
TD260
TD261
TD262
TD263
TD264
TD265
TD266
TD267*
TD268
TD269
TD270
TD271
TD272
TD273*
TD274
TD275*
TD276
TD277
TD278*
TD279
TD182
TD183
TD1001(c)
TD1002(c)
TD1003(c)
TD1004(c)
TD1005
TD1006
TD1006
TD1007
TD1008
TD1009
TD1010
TD1011
TD1012
TD1013
TD1014
TD1015
* : sample containing crush breccia/protocataclasite
(c): sample, drilled by means of hand drill (cylindrical)
Timothy N. Debacker
September 2001 - September 2004
-------------------------------------------------------
Table 2 - Samples taken at outcrop northern Asquempont section 2
(BGD115E0912)
Apart from sample number (column 1), position of sample (column 2) and sample orientation (column
3), also the date of sampling (column 4), the number of thin sections made, and the fabric analyses
performed (AMS: anisotropy of magnetic susceptibility performed at University of Leuven; ltAMS:
low-temperature AMS, performed at 77K at ETH, Zurich; AARM: anisotropy of anhysteretic remanent
magnetism, performed at University of Cergy-Pontoise, France; PFG: X-ray-pole figure goniometry,
performed by M. Sintubin at University of Leuven) (column 5) and some remarks are given (column
6). The remarks concern the formation name to which the sample belongs, particular structural,
lithological or sedimentological observations (e.g. bedding orientation (S0); cleavage orientation (S1)),
sometimes the purpose for sampling, or the orientation of the axes of thin sections (a, b, c).
Orientations of planar elements (cleavage plane, bedding plane, fault plane,...) are given as strike/dip,
followed by the azimuth direction of the dip (e.g. 025/30 SE for a plane with strike 025°, dipping 30°
towards the SE) and orientations of linear elements (striation, intersection lineation,...) are given as
plunge/plunge direction (e.g. 30/025 for a line plunging 30° towards 025). In all cases, an azimuth
notation is used for strike and plunge direction going from 0° (N), over 180° (S) to 360° (N). The *-
symbol after an orientation signifies that the measured plane is overturned. The majority of the samples
is taken from Debacker (2001), with additional samples of Debacker et al. (2004b, 2004c, 2005), taken
for magnetic fabric analyses between 2001 and 2005.
Sample
Position
Orientation
Date
Thin
sect.
Remarks/purpose
TD180
Northern Asquempont section 2; 3 m S of
post 2029; 40.607 km, 2 m high
252/68N
06/09/99
Oisquercq Fm., Asquempont Member;
bedding: 147/80SW
TD181
Northern Asquempont section 2; 6 m S of
post 2029; 40.604 km, 7 m high
144/82SW
06/09/99
2
Oisquercq Fm., Asquempont Member;
bedding: 144/82SW
TD182
Northern Asquempont section 2; 4 m N of
fourth post N of Asquempont bridge
292/46N
06/09/99
Oisquercq Fm., Asquempont Member;
bedding: /
TD183
Northern Asquempont section 2; 4 m N
fourth post N of Asquempont bridge
108/82S
06/09/99
Oisquercq Fm., Asquempont Member;
bedding: 108/82S
TD184
Northern Asquempont section 2; 41-380.5
m; 40.6195 km, 1.5 m high
315/90NE,
028/69SE*
15/05/00
Oisquercq Fm., Asquempont Member ;
striations ; bedding : 315/90NE
TD185
Northern Asquempont section 2; 41-342.7
m; 40.6573 km, 1 m high
139/69SW,
128/62SW,
155/28SW
15/05/00
PFG
Oisquercq Fm., Asquempont Member;
bedding: 132/73SW
TD186
Northern Asquempont section 2; 41-253 m;
40.747 km, 0.7 m high
301/48NE
24/05/00
PFG
Oisquercq Fm., Asquempont Member ;
bedding : 332/55NE ( ?)
TD187
Northern Asquempont section 2; 41-251 m;
40.749 km, 1 m high
296/82NE*
24/05/00
Oisquercq Fm., Asquempont Member ;
bedding : 296/82NE ( ?, vague)
TD188
Northern Asquempont section 2; 41-214 m;
40.786 km, 6.5 m high
312/77NE*
187/ 74W
25/05/00
Oisquercq Fm., Asq. Mem; bedding: ?,
vague alignment parallel to cleavage
(321/77NE)
TD189
Northern Asquempont section 2; 41-213.5
m; 40.7865 km, 4.2 m high
314/67NE*,
241/60NW
25/05/00
Oisquercq Fm., Asquempont Member ;
bedding : /
TD190
Northern Asquempont section 2; 41-213.5
m; 40.7865 km, 4.2 m high, adjacent to
TD189
316/76NE*
25/05/00
Oisquercq Fm., Asquempont Member;
bedding: /; deformed
TD191
Northern Asquempont section 2; 41-156 m;
40.844 km, 1.5 m high
308/76NE*
31/05/00
Oisquercq Fm., Asquempont Member;
bedding: 019/50E (?)
TD192
Northern Asquempont section 2; 41-151.2
m; 40.8488 km, 1.7 m high
195/90W
31/05/00
PFG
Oisquercq Fm., Asquempont Member;
bedding: 070/57S
TD193
Northern Asquempont section 2; 41-141 m;
40.859 km, 3 m high
326/80NE*,
100/24S
31/05/00
Oisquercq Fm., Asquempont Member;
bedding: /
TD194
Northern Asquempont section 2; 41-99 m;
40.901 km, 2.5 m high
122/73SW
06/06/00
Oisquercq Fm., Asquempont Member;
bedding: 122/73SW (?)
TD195
Northern Asquempont section 2; 41-91.5 m;
40.9085 km, 1.2 m high
271/76N,
306/62NE*
06/06/00
PFG
2
Oisquercq Fm., Asquempont Member;
bedding: 148/18SW
TD196
Northern Asquempont section 2; 41-87 m;
40.913 km, 1.5 m high
112/37S
13/06/00
PFG
Oisquercq Fm., Asquempont Member;
bedding: 112/37S
TD197
Northern Asquempont section 2; 41-84.5 m;
40.9155 km, 7m high
205/80W
13/06/00
PFG,
AMS
Oisquercq Fm., Asquempont Member;
bedding: 112/75S
TD198
Northern Asquempont section 2; 41-79.5 m;
40.9205 km, 5m high
133/61SW
13/06/00
Oisquercq Fm., Asquempont Member;
bedding: 133/61SW (?)
TD199
Northern Asquempont section 2; 41-52 m;
40.948 km, 2m high
115/59S,
295/78NE*
13/06/00
AMS
Oisquercq Fm., Asquempont Member;
bedding: 115/59SW
TD240
Northern Asquempont section 2; 41 km-44
m; 40.956 km, 5.5 m high
112/48S,
311/61NE*
14/06/00
Oisquercq Fm., Asquempont Member;
bedding: 113/48SW
TD241
Northern Asquempont section 2; 41 km-34
m; 40.966 km, 5 m high
128/48SW,
305/74NE*
14/06/00
Oisquercq Fm., Asquempont Member;
bedding: 108/45S
TD242
Northern Asquempont section 2; 41 km-30
m; 40.970 km, 1.5 m high
103/44S
14/06/00
Oisquercq Fm., Asquempont Member;
bedding: 103/44S
TD243
Northern Asquempont section 2; 41 km-30
m; 40.970 km, 1.5 m high
122/84SW,
212/89NW
14/06/00
Oisquercq Fm., Asquempont Member;
bedding: 106/45S
TD243'
Northern Asquempont section 2; 41 km-30
m; 40.970 km, 1.5 m high
/
14/06/00
1
Oisquercq Fm., Asquempont Member;
volcanic interstratified rock
TD244
Northern Asquempont section 2; 41 km-30
m; 40.970 km, 1.5 m high
121/42SW
14/06/00
Oisquercq Fm., Asq. Mem.; bedding:
106/42S (?); volcanic rock in lower part of
sample
TD245
Northern Asquempont section 2; 41 km-30
m; 40.970km, 1.5 m high
115/63SW,
328/82NE
14/06/00
Oisquercq Fm., Asq. Mem.; bedding:
111/38S; volcanic rock in upper part of
sample
TD246
Northern Asquempont section 2; 41 km-
24.5 m; 40.9755 km, 4.7 m high
109/59S,
110/76S
14/06/00
Oisquercq Fm., Asquempont Member;
bedding: 113/40S
TD247
Northern Asquempont section 2; 41 km-26
m; 40.974 km, 6 m high
144/47SW,
305/85NE*
14/06/00
Oisquercq Fm., Asquempont Member;
bedding: /
TD248
Northern Asquempont section 2; 41 km-19
m; 40.981 km, 4 m high
137/55SW,
125/44SW
14/06/00
2 (ac,bc)
PFG
AMS
Oisquercq Fm., Asquempont Member;
bedding: 139/50SW
a: 00/115; b: 85/215; c: 05/035
TD249
Northern Asquempont section 2; 41 km-19
m; 40.981 km, 6 m high
121/55SW,
307/81NE*
14/06/00
Oisquercq Fm., Asquempont Member;
bedding: 134/58SW
TD250
Northern Asquempont section 2; 41 km-14
m; 40.986 km, 5 m high
127/43SW
14/06/00
Oisquercq Fm., Asquempont Member;
bedding: 127/43SW
TD251
Northern Asquempont section 2; 41 km-1.5
m; 40.9985 km, 2 m high
111/64S,
291/81N*
14/06/00
Oisquercq Fm., Asquempont Member;
bedding: 111/64S
TD252
Northern Asquempont section 2; 41.055
km, 5 m high
302/81NE*
15/06/00
Oisquercq Fm., Ripain Member; bedding: /
TD253
Northern Asquempont section 2; 41.101
km, 3 m high
042/77SE,
294/82NE*
16/06/00
Oisquercq Fm., Ripain Member; bedding: /
TD254
Northern Asquempont section 2; 41.092
km, 2.5 m high
128/87SW
16/06/00
Oisquercq Fm., Ripain Member; bedding: /
TD255
Northern Asquempont section 2; 41.0405
km, 4 m high
303/81NE*,
312/75NE*
16/06/00
2
Oisquercq Fm., Ripain Member; bedding:
322/73NE(?)
TD256
Northern Asquempont section 2; 41.0395
km, 6 m high
308/74NE*
16/06/00
2 (ac,bc)
PFG
AMS
ltAMS
Oisquercq Fm., Ripain Member; bedding:
329/75NE(?)
a: 00/308; b: 74/038; c: 16/218
TD257
Northern Asquempont section 2; 41.0295
km, 1.5 m high
305/78NE*
16/06/00
Oisquercq Fm., Ripain Member; bedding: /
TD258
Northern Asquempont section 2; 41.0295
km, 1.5 m high, adjacent to TD257
294/68NE*
16/06/00
2
Oisquercq Fm., Ripain Member; bedding: /;
vein oriented 313/46NE
TD259
Northern Asquempont section 2; 41-275 m;
40.725 km, 1.8 m high
204/63NW,
307/74NE,
306/65NE*
21/06/00
2
Oisquercq Fm., Asquempont Member;
bedding: /; post or pre-cleavage breccia?
TD260
Northern Asquempont section 2; 41-258 m;
40.742 km, 1 m high
310/ 87NE,
040/72SE*
21/06/00
2 AMS
AARM
Oisquercq Fm., Asquempont Member ;
bedding : 126/77SW
TD261
Northern Asquempont section 2; 41-241 m;
40.759 km, 2.2 m high
106/67S,
116/70SW
21/06/00
Oisquercq Fm., Asquempont Member;
bedding: 072/45S
TD262
Northern Asquempont section 2; 41-220.5
m; 40.7795 km, 1.3 m high
128/35SW,
210/48NW,
326/80NE*
21/06/00
AMS
Oisquercq Fm., Asquempont Member;
bedding: 326/80NE
TD263
Northern Asquempont section 2; 41-213 m;
40.787 km, 0.7 m high
184/59W,
181/21W,
312/71NE*
21/06/00
Oisquercq Fm., Asquempont Member;
bedding: 327/87NE
TD264
Northern Asquempont section 2; 41-179 m;
40.821 km, 0.7 m high
229/85NW,
313/63NE*
21/06/00
Oisquercq Fm., Asquempont Member ;
bedding : 337/62NE
TD265
Northern Asquempont section 2; 41-169 m;
40.831 km, 3 m high
299/46NE,
107/57S
21/06/00
Oisquercq Fm., Asquempont Member;
bedding: 104/60S
TD266
Northern Asquempont section 2; 41-159 m;
40.841 km, 2 m high
299/72NE*
21/06/00
2 (ac,bc)
AMS
AARM
ltAMS
Oisquercq Fm., Asq. Mem.; bedding
orientation changes : 047/48SE to 055/38SE
a: 00/299 ; b: 72/ 029 ; c :18/209
TD267
Northern Asquempont section 2; 41-144 m;
40.856 km, 1.7 m high
307/48NE,
189/80W
21/06/00
Oisquercq Fm., Asq. Mem.; bedding: /;
deformed; ductile/brittle, post/pre-cleavage?
TD268
Northern Asquempont section 2; 40.769
km, 1.3 m high
199/40W,
135/88SW
06/07/00
Oisquercq Fm., Asquempont Member;
bedding: 000/77E
TD269
Northern Asquempont section 2; 40.765
km, 1.6 m high
296/68NE*
06/07/00
1
Oisquercq Fm., Asquempont Member ;
bedding : 332/67NE
TD270
Northern Asquempont section 2; 40.7777
km, 0.9 m high
127/76SW,
294/66NE*
06/07/00
Oisquercq Fm., Asquempont Member ;
bedding : 328/82NE
TD271
Northern Asquempont section 2; 40.803
km, 1.8 m high
200/40W,
070/50S,
301/69NE*
06/07/00
AMS
Oisquercq Fm., Asquempont Member;
bedding: 318/80NE
TD272
Northern Asquempont section 2; 40.8135
km, 1.5 m high
190/76SW
149/31SW
06/07/00
PFG
Oisquercq Fm., Asquempont Member ;
bedding orientation changes : 325/79NE,
320/82NE
TD273
Northern Asquempont section 2; 40.824
km, 1.4 m high
136/38SW,
234/70NW,
325/72NE*
06/07/00
Oisquercq Fm., Asquempont Member;
bedding: /; deformed pre- and post-cleavage?
TD274
Northern Asquempont section 2; 40.822
km, 1.4 m high
125/50SW,
318/43NE*
06/07/00
AMS
AARM
ltAMS
Oisquercq Fm.; vague curved alignment
along 033/85SE to 014/79E; slightly
deformed
TD275
Northern Asquempont section 2; 40.861
km, 1.7 m high
302/79NE*
06/07/00
Oisquercq Fm., Asq. mem.; bedding: /;
breccia, pre- or post-cleavage? seems pre-
cleavage
TD276
Northern Asquempont section 2; 40.8725
km, 0.8 m high
125/73SW
06/07/00
PFG
Oisquercq Fm., Asquempont Member;
bedding: 125/73SW
TD277
Northern Asquempont section 2; 40.8857
km, 0.5 m high
125/69SW,
152/10SW
06/07/00
Oisquercq Fm., Asquempont Member;
bedding: 125/69SW
TD278
Northern Asquempont section 2; 41.005
km, 1.8 m high
177/59W,
301/66NE*
06/07/00
Oisquercq Fm., Asq. mem.; bedding: /;
deformed, pre- or post-cleavage?; large
pyrites occur
TD279
Northern Asquempont section 2; 41.0155
km, 0.4 m high
302/63NE*
06/07/00
PFG
AMS
AARM
Oisquercq Fm.; S0: 324/75NE; S1:
302/63NE
TD1001
(I)
Cylinder Northern Asquempont section 2; 9
m S of P2018: 41.0406 km, 3-3.5 m high
TD1001a-
TD1001d
AMS
Oisquercq Fm., Ripain Mem.
TD1002
(II)
Cylinder Northern Asquempont section 2;
21 m N of P2019: 41.03085 km, 1.5-2 m
high
TD1002a-
TD1002d
AMS
Oisquercq Fm., Ripain Mem.
TD1003
(III)
Cylinder Northern Asquempont section 2;
0.5 m S of P2021: 40.929 km, 1.5-2 m high
TD1003a-
TD1003e
AMS
Oisquercq Fm., Asquempont Mem.
TD1004
(IV)
Cylinder Northern Asquempont section 2;
13 m N of P2025: 40.7825 km, 0.5 m high
TD1004a-
TD1004f
AMS
Oisquercq Fm., Asquempont Mem.
TD1005
(TD001)
Northern Asquempont section 2; 9 m S of
P2018: 41.0406 km, 4-4.5 m high
322/75NE
AMS
AARM
ltAMS
Oisquercq Fm., Ripain Mem. S0: 322/75NE;
S1: 299/76NE
TD1006
(TD002)
Northern Asquempont section 2; 16 m S of
P2018: 41.0336 km, 2 m high
305/85NE*
AMS
AARM
Oisquercq Fm., Ripain Mem. S0: 326/68NE;
S1: 294/65NE; a: 00/305 ; b: 85/035 ; c:
15/215
TD1007
(TD003)
Northern Asquempont section 2; 11.5 m N
of P2025: 40.781 km, 0.5 m high
324/75NE*
2 (ac,bc)
AMS
Oisquercq Fm., Asquempont Mem. S0:
336/76NE; S1: 324/75NE(?), 313/65NE;
a: 00/324 ; b: 75/054 ; c: 15/234
TD1008
(TD004)
Northern Asquempont section 2; 11 m N of
P2025: 40.7805 km, 2 m high
209/57NW
317/69NE*
AMS
Oisquercq Fm., Asquempont Mem. S0:
334/70NE; S1: 317/69NE
TD1009
(I)
Northern Asquempont section 2;
41.018 km, 1.5 m high (bottom outcrop)
311/69NE*
(S1)
13/02/04
AMS
Oisquercq Fm., Asquempont Mem..
S0: 328/70NE; S1: 311/69NE. Dextral
striations : 37°S on 338/86E
TD1010
(II)
Northern Asquempont section 2;
41.0205 km, 1.5 m high (bottom outcrop)
311/66NE*
(S0?)
13/02/04
AMS
AARM
ltAMS
Oisquercq Fm., blue grey, Ripain Mem. (?).
S0: 311/66NE(?); S1: 291/63N
Dextral striations : 32°S on 152/89W
TD1011
(III)
Northern Asquempont section 2;
41.0238 km, 1.8 m high
308/74NE*
(S1?)
13/02/04
AMS
Oisquercq Fm., Ripain Mem. S0: ?; S1:
308/74NE
TD1012
(IV)
Northern Asquempont section 2;
41.0221 km, 1.8 m high
325/68NE*
(S0?)
13/02/04
AMS
Oisquercq Fm., Ripain Mem. striated
surface: 325/68NE (S0?); S0: 322/68NE; S1:
307/69NE
TD1013
(V)
Northern Asquempont section 2;
41.0198 km, 1.9 - 2 m high
302/66NE*
(S1)
13/02/04
AMS
Oisquercq Fm., Ripain Mem. S0: ?; S1:
302/66NE; note: strange ellipses present.
TD1014
(VI)
Northern Asquempont section 2;
41.0178 km, 3. 2 m high; 1.5 - 2 E of
TD1009
322/71NE*
(S0?)
13/02/04
AMS
Oisquercq Fm., Ripain Mem.
S0: 322/71NE; S1: 305/73NE
TD1015
(VII)
Northern Asquempont section 2;
41.0153 km, 1. 5 m high
118/82SW;
298/60NE*
(~S1)
13/02/04
AMS
Oisquercq Fm., Asquempont Mem.
S0: 310/58NE; S1: 291/65N
Timothy N. Debacker
September 2001 - September 2004
------------------------
Table 3 - Table showing interpreted bedding and cleavage data from outcrop
northern Asquempont section 2 (BGD115E0912), taken from Debacker et al.
(2004b).
Based on the orientation of bedding and cleavage/bedding intersection six zones can be distinguished,
three with a gently plunging cleavage/bedding intersection and fold hinge lines (white), and three with
a moderately to steeply plunging cleavage/bedding intersection and fold hinge lines (grey). The former
reflect zones of type A folds, the latter zones of type B folds. Based on observations throughout the
Sennette valley (e.g. Debacker, 2001 and references therein), the limit between both fold types is taken
to correspond with a 35° plunge of the cleavage/bedding intersection and fold hinge lines. Note that the
two relatively large zones with a moderate to steep intersection lineation have higher cleavage strike
values (>300° in this outcrop) than the two large zones with a gently plunging intersection lineation.
Orientations of planar elements (cleavage plane, bedding plane,...) are given as strike/dip, followed by
the azimuth direction of the dip (e.g. 025/30 SE for a plane with strike 025°, dipping 30° towards the
SE) and orientations of linear elements (intersection lineation,...) are given as plunge/plunge direction
(e.g. 30/025 for a line plunging 30° towards 025). In all cases, an azimuth notation is used for strike
and plunge direction going from 0° (N), over 180° (S) to 360° (N). B-axis: Beta-axis; cw: clockwise
cleavage transection; acw: anticlockwise cleavage transection. Except for the last column, numbers of
data are written between brackets.
Outcrop
interval
Bedding (S0)
measured in
outcrop
Sample position:
distance, height
Sample
number
Bedding
(S0*) in
sample
Mean
cleavage
(S1)
S0*/S1-
intersec-
tion
Angle
S0*^
S1
S1 tran-
section
(to S0)
Large zonation based
on orientation data
40590 -
40630 m
(17)
mean: 140/88SW
B-axis: 24/319
40604 m, 7 m
TD181
144/82SW
297/56NE
? 008 (18)
30/319
49°
003°acw
S0: n = 108
B-axis: 24/135
S0*: n = 5
S0 + S0*: n = 113
B-axis: 25/136
S1: n = 87
mean: 292/57N ?
012°
transection: 031°acw
(S0)
40607 m, 2 m
TD180
147/80SW
31/321
52°
40619.5 m, 1.5 m
TD184
315/90NE
25/315
38°
40630 -
40673 m
(27)
mean: 129/72SW
B-axis: 09/132
40657 m, 1 m
TD185
132/73SW
298/59NE
? 011 (20)
15/307
50°
016°acw
40673 -
40685 m
(16)
mean: 123/59SW
B-axis: 05/126
/
/
/
287/62N
? 012 (12)
/
/
020°acw
40685 -
40700 m
(11)
mean: 114/42SW
/
/
/
297/53NE
? 015 (10)
/
/
/
40700 -
40725 m
(26)
mean: 111/59S
B-axis: 15/120
/
/
/
282/52N
? 010 (20)
/
/
023°acw
40725 m, 1.8 m
TD259
Breccia
/
/
40725 -
40745 m
(11)
mean: 125/82SW
B-axis: 15/127
40742 m, 1 m
TD260
126/77SW
295/65NE
? 006 (7)
15/302
39°
017°acw
40745 -
40750 m
/
40747 m, 0.7 m
TD186
332/55NE
/
54/074
/
/
S0*: n = 1
40749 m, 1 m
TD187
296/82NE
/
03/296
/
/
S0*: n = 1
40750 -
40825 m
/
40759 m, 2.2 m
TD261
072/45S
311/69NE
? 008 (36)
35/116
85°
/
S0: /
S0*: n = 12
B-axis: 59/130
S1: n = 36
mean: 311/69NE
311 ? 008°
transection: 017°acw
(S0*)
40765 m, 1.6 m
TD269
332/67NE
67/074
20°
40769 m, 1.3 m
TD268
000/77E
70/039
47°
40777.5 m, 0.9 m
TD270
328/82NE
51/338
21°
40779.5 m, 1.3 m
TD262
326/80NE
52/339
18°
40780.5 m, 2 m
TD004
334/70NE
69/045
22°
40781 m, 0.5 m
TD003
336/76NE
66/010
25°
40786 m, 6.5 m
TD188
/
/
/
40786.5 m, 4.2 m
TD189
/
/
/
40786.5 m, 4.2 m
TD190
Breccia
/
/
40787 m, 0.7 m
TD263
327/87NE
41/330
24°
40803 m, 1.8 m
TD271
318/80NE
33/324
13°
40813.5 m, 1.5 m
TD272
323/81NE
44/333
17°
40821 m, 0.7 m
TD264
337/62NE
59/093
25°
40822 m, 1.4 m
TD274
024/82SE
70/047
71°
40824 m, 1.4 m
TD273
Breccia
/
/
40825 -
40840 m
(9)
(mean: 099/49S)
B-axis: 21/118
40831 m, 3 m
TD265
104/60S
307/71NE
? 008 (17)
18/115
55°
001°cw
S0: n = 9, B-axis:
21/118; S1: n = 17,
mean: 307/71NE ?
008°; transection:
001°cw (S0)
40840 -
40850 m
/
40841 m, 2 m
TD266
051/43SE
295/64NE
? 010 (10)
37/104
86°
/
S0: /; S0*: n = 3,
B-axis: 47/122
S1: n = 18, mean:
299/66NE ? 012°
transection: 019°acw
(S0*)
40844 m, 1.5 m
TD191
019/50E
49/094
66°
40849 m, 1.7 m
TD192
070/57S
40/102
74°
40850 -
40890 m
/
40856 m, 1.7 m
TD267
Breccia
303/68NE
? 012 (8)
/
/
/
40859 m, 3 m
TD193
/
/
/
40861 m, 1.7 m
TD275
Breccia
/
/
40872.5 m, 0.8 m
TD276
125/73SW
308/68NE
? 008 (7)
04/126
39°
/
S0: n = 77
B-axis: 12/294
S0*: n = 19
mean: 119/53SW
B-axis: 07/124
S0 + S0*: n = 96
B-axis: 10/298
S1: n = 83
mean: 295/67NE ?
009°
transection: 006°cw
(S0)
transection: 010°acw
(S0*)
transection: 003°cw
(S0 + S0*)
40885.5 m, 0.5 m
TD277
125/69SW
04/126
43°
40890 -
40910 m
(13)
(mean: 134/50S)
B-axis: 18/298
40901 m, 2.5 m
TD194
122/73SW
298/63NE
? 012 (14)
05/301
44°
008°cw
40908.5 m, 1.2 m
TD195
148/18SW
08/302
79°
40910 -
40935 m
(34)
mean: 125/54SW
B-axis: 12/296
40913 m, 1.5 m
TD196
112/37S
296/65NE
? 008 (21)
02/115
78°
006°cw
40915.5 m, 7 m
TD197
112/75S
05/113
40°
40920.5 m, 5 m
TD198
133/61SW
16/304
56°
40935 -
40960 m
(11)
mean: 119/58SW
B-axis: 10/126
40948 m, 2 m
TD199
115/59SW
297/71NE
? 007 (8)
02/116
50°
012°acw
40956 m, 5.5 m
TD240
113/48SW
03/116
61°
40960 -
40980 m
(12)
mean: 114/47SW
40966 m, 5 m
TD241
108/45S
289/66N ?
008 (18)
01/109
69°
/
40970 m, 1.5 m
TD242
103/44S
04/107
70°
40970 m, 1.5 m
TD243
106/45S
02/108
69°
40970 m, 1.5 m
TD244
106/42S
02/108
72°
40970 m, 1.5 m
TD245
111/38S
01/290
76°
40974 m, 6 m
TD247
/
/
/
40975.5 m, 4.7 m
TD246
113/40SW
02/290
74°
40980 -
41005 m
(7)
mean: 132/48SW
40981 m, 4 m
TD248
139/50SW
294/74NE
? 005 (15)
21/300
61°
/
40981 m, 6 m
TD249
134/58SW
21/300
52°
40986 m, 5 m
TD250
127/73SW
21/300
35°
40998.5 m, 2 m
TD251
111/64S
04/113
42°
41005 m, 1.8 m
TD278
Breccia
/
/
41005 -
41020 m
/
41015.5 m, 0.4 m
TD279
326/74NE
301/68NE
? 008 (15)
66/006
24°
/
S0: n = 9
mean: 323/77NE (5)
and: 271/82N (4)
B-axis: 78/029
S0*: n = 5
mean: 325/73NE
B-axis S0 + S0*:
76/046
S1: n = 87
mean: 302/77NE
302 ? 006°
transection: 000° (S0
+S0*), 002°cw (S0)
41020 -
41040 m
/
41029.5 m, 1.5 m
TD257
/
302/77NE
? 006 (17)
/
/
/
41029.5 m, 1.5 m
TD258
/
/
/
41033.6 m; 2 m
TD002
326/68NE
62/096
25°
41039.5 m, 6 m
TD256
329/75NE
75/063
26°
41040 -
41060 m
(9); mean: 323/
77NE (5) and
271/82N (4)
B-axis: 78/029
41040.5 m, 4 m
TD255
322/73NE
305/76NE
? 006 (16)
71/080
17°
002°cw
41040.6 m, 4.3 m
TD001
322/75NE
75/057
16°
41055 m, 5 m
TD252
/
/
/
41060 -
41080 m
/
/
/
/
301/78NE
? 006 (19)
/
/
/
41080 -
41110 m
/
41092 m, 2.5 m
TD254
/
302/83NE
? 005 (20)
/
/
/
41101 m, 3 m
TD253
/
/
/
Zones with moderately to steeply plunging intersections
Zones with gently plunging intersections
S0: n = 9, B-axis: 78/029
S0*: n = 21, B-axis: 51/130
S0* + S0: n = 30, B-axis: 63/110
S1: n = 141; mean: 304/73NE ? 009°
B-axis: 20/310
Transection: 005°cw (S0)
Transection: 017°acw (S0*)
Transection: 010°acw (S0 + S0*)
S0 + S0* + S1: n = 171, B-axis: 64/090
S0* + S1: n = 162, B-axis: 59/098
S0: n = 194, B-axis: 12/130
S0*: n = 26, B-axis: 15/131
S0* + S0: n = 220, B-axis: 12/130
S1: n = 187, mean: 295/63NE ? 012°
B-axis: 35/316
Transection: 019°acw (S0)
Transection: 021°acw (S0*)
Transection: 019°acw (S0 + S0*)
S0 + S0* + S1: n = 407, B-axis: 05/300
S0 + S1: n = 381, B-axis: 06/300
Timothy N. Debacker
September 2001 - September 2004
-------------------------------------
Table 4 - Table of mean bedding, cleavage and fracture data from outcrop
northern Asquempont section 2 (BGD115E0912), taken from Debacker et al.
(2004b).
Because of the lack of cleavage/bedding intersections measured in outcrop northern Asquempont
section 2 in zones of type B folds, only the lineations constructed as the intersection of bedding
determined on oriented samples (S0*) and cleavage measured in outcrop are given for both the type A
and type B folds. For more detail concerning this outcrop, the reader is referred to table 3. B-axis: Beta-
axis; ACW: anticlockwise cleavage transection. Orientations of planar elements (cleavage plane,
bedding plane, fracture plane,...) are given as strike/dip, followed by the azimuth direction of the dip
(e.g. 025/30 SE for a plane with strike 025°, dipping 30° towards the SE) and orientations of linear
elements (intersection lineation,...) are given as plunge/plunge direction (e.g. 30/025 for a line plunging
30° towards 025). In all cases, an azimuth notation is used for strike and plunge direction going from 0°
(N), over 180° (S) to 360° (N).
Outcrop and position
Bedding (S0)
Cleavage (S1)
S1/S0
intersection
S0 and S1
merged
S1-tran-
section
Fractures
N. A. S. 2, type A
folds (see table 3)
S0, S0*: n = 220
B-axis: 12/130
n = 187
mean: 295/63NE ± 012°
B-axis: 35/316
n = 26: mean:
06/299 ± 009°
n = 407
B-axis: 05/300
019°
ACW
n = 30 (infilled)
020/78SE ± 012°
B-axis: 22/195
N. A. S. 2, type B
folds (see table 3)
S0, S0*: n = 30
B-axis: 63/110
n = 141
mean: 304/73NE ± 009°
B-axis: 20/310
n = 17: mean:
68/046
n = 171
B-axis: 64/090
010°
ACW
n = 21 (infilled)
197/66W ± 008°
B-axis: 35/215
Timothy N. Debacker
September 2001 - September 2004
BELGISCHE GEOLOGISCHE DIENST
115E0912 (VIII,c)/ KAARTBLAD: ITTRE
p. 1/1416
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