Recognition and implication of tectonic loading-induced reheating in the northern Variscan front (Belgium and northern France), based on an illite Kubler index and oxygen isotope study
Han, G.; Yans, J.; Goudalier, M.et al.
2003 • In International Journal of Earth Sciences, 92 (3), p. 348-363
[en] Illite Kubler index (KI) and oxygen isotope (brachiopods and micrites) investigations have been performed on more than 300 Frasnian limestones sampled in one borehole and numerous outcrops in the Dinant Synclinorium (Belgium, northern France) of the northern Variscan front. The illite Kubler index and delta(18)O data of a 3-km-thick, tectonically repeated Frasnian series from the Focant borehole are compared with their surrounding surface correspondents and document in-situ reheating induced by Variscan tectonic loading, which post-dated sedimentary burial alteration. The boundary between these two thermal processes (sedimentary burial and tectonic loading) on the Focant profile corresponds to an important location where the heat induced by the tectonic loading was equivalent to that Frasnian strata suffered during maximum sedimentary burial. Mainly based on this knowledge and on a former conodont colour alteration index study, the thickness of the eroded thrust sheet in the Focant area is estimated to be around 3,000 m. Oxygen isotopic exchange in these Frasnian closed carbonate systems, occurring under highest-grade diagenesis and anchimetamorphism, records two events. Brachiopods present a quite different and more homogeneous pattern, due to their higher resistance to heat alteration. These thermal events caused both delta(18)O records to become increasingly lighter than the presumed original seawater signature. The comparison between KI and delta(18)O profiles indicates that illite KI analysis is more appropriate than delta(18)O in highlighting the temperature variations in the burial metamorphism at the periphery of orogenic belts.
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Author, co-author :
Han, G.
Yans, J.
Goudalier, M.
Lacquement, F.
Corfield, R. M.
Mansy, J. L.
Boulvain, Frédéric ; Université de Liège - ULiège > Département de géologie > Pétrologie sédimentaire
Preat, A.
Language :
English
Title :
Recognition and implication of tectonic loading-induced reheating in the northern Variscan front (Belgium and northern France), based on an illite Kubler index and oxygen isotope study
Publication date :
July 2003
Journal title :
International Journal of Earth Sciences
ISSN :
1437-3254
eISSN :
1437-3262
Publisher :
Springer-Verlag, New York, United States - New York
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