Unit of Earth Sciences
Department of Geosciences | University of Fribourg
Geology of the Luxembourg Ardenne (Eisleck)
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Created December 12, 1996; Last updated: 2 April 2004
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SCHISTOSITE ET METAMORPHISME HERCYNIENS DANS LES ARDENNES LUXEMBOURGEOISES
Jon MOSAR Sci. Géol. Bull., 40, 3, p. 231 - 243, Strasbourg, 1987
RESUME - Les schistes du Dévonien inférieur des Ardennes luxembourgeoises sont affectés par une schistosité du plan axial. L'étude de la fabrique de la roche au microscope optique et au goniomètre de texture RX permet de montrer quela néoformation de la majorité des phyllosilicates est synschisteuse. Ceci permet de conclure que le métamorphisme d'anchi- et d'épizone - étudié sur des fractions argileuses < 2um - est contemporain de la schistogenèse hercynienne.
Hercynian cleavage and metamporphism in the Luxemburg Ardenne
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ABSTRACT - Lower Devonian rocks in the studied area show
a spaced slaty cleavage.The penetrativity of the rock clevage
depends on the relative percentage of quartz and phyllosicates
in the rock and its position with respect to the folds (limb or hinge).
The rock fabric, studied by means of optical microscopy and X-ray
texture goniometer, shows that the neoformation of white micas
and chlorites is mainly due to the development of the slaty cleavage.
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This leads us to the conclusion that the archi- and
epizonal metamorphism, studied by the method of
ilite crystalinity, is contemporary with the
development of hercynian rock cleavage in the lower
Devonian rocks. Boudins from the type locality near
Bastogne (Ardennes, Belgium; quarries E of Bastogne along Wiltz river)
Detailed investigation concerning these boudins, their orientation, structure etc. can be found in: 1) Lambert E. & Bellière J. (1976) Caractères structuraux de l'éodévonien aux environs de Bastogne. Ann. Soc. Géol. Belgique, T.99,pp.283-297. 2) Rondeel H.E. & Voermans F.M. (1975) Data pertinent to the phenomenon of boudinage at Bastogne in the Ardennes. Geologische Rundschau, 64,pp.807-818. 3) Jongmans D. & Cosgrove J.W. (1994) Observations structurales dans la région de Bastogne. Ann. Soc. Géol. Belgique,T.116/1,pp.129-136.
Pictures of rock cleavage, ripples, fractures and folds from the Luxembourg Ardennes (Eisleck)
