Article (Scientific journals)
Palaeoenvironmental reconstitutions at the Carboniferous–Permian transition south of the Paris Basin, France: implications on the stratigraphic evolution and basin geometry
Mercuzot, Mathilde; Bourquin, Sylvie; Beccaletto, Laurent et al.
2020In International Journal of Earth Sciences
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Keywords :
Carboniferous–Permian of Decize-la Machine Basin; Sedimentological analyses; Sequence stratigraphy
Abstract :
[en] The late Carboniferous-to-Permian coal-bearing Decize-La Machine Basin, and more specifically the Lucenay-lès-Aix area, located south of the Paris Basin, has been investigated to reassess the palaeoenvironmental evolution and the basin architecture. The detailed sedimentological study has been carried out based on core data and digitised old mining data, i.e., seismic profiles and well-logs. An interpretation of well-logs without core data is proposed, based on a palaeoenvironmental interpretation from cores and their respective well-log data, and three depositional environments have been defined: an alluvial plain, an alluvial-fan, and deltaic and lacustrine environments. Correlations between wells have been performed using markers identified in seismic profiles, paired with sequence stratigraphic interpretations from well-log and core data. An evolution in seven major progradational–retrogradational stratigraphic cycles is proposed based on the evolution of the depositional environment observed at the basin scale, leading to a reconstruction of palaeogeographic maps at the Carboniferous–Permian transition. This new viewpoint shows that through time, the deposits, proximal at the base of the succession with coal preservation, become more lacustrine with the delta prograding into the basin. In consequence, the basin evolution hows a general retrogradational trend with increasing lacustrine deposits at the top of the succession eroded by the Permian–Triassic unconformity. Therefore, the current borders of the basin in the Lucenay-lès-Aix area are not representative of those at the time of the sedimentary filling, and thus, this area could be part of a larger one, perhaps encompassing all north-eastern French Massif Central late Carboniferous-to-Permian basins.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Mercuzot, Mathilde;  Université de Rennes 1, CNRS > UMR 6118 > Géosciences Rennes
Bourquin, Sylvie;  Université de Rennes 1, CNRS > UMR 6118 > Géosciences Rennes
Beccaletto, Laurent;  BRGM
Ducassou, Céline;  Université de Rennes 1 > UMR 6118 > Géosciences Rennes
Rubi, Romain ;  Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire
Pellenard, Pierre;  Université Bourgogne > UMR uB/CNRS 6282 > Biogéosciences
Language :
English
Title :
Palaeoenvironmental reconstitutions at the Carboniferous–Permian transition south of the Paris Basin, France: implications on the stratigraphic evolution and basin geometry
Publication date :
13 October 2020
Journal title :
International Journal of Earth Sciences
ISSN :
1437-3254
eISSN :
1437-3262
Publisher :
Springer, Germany
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
TelluS Program of CNRS/INSU
Funders :
Bretagne region (France)
BRGM - Bureau de Recherches Géologiques et Minières [FR]
INSU - Institut National des Sciences de l'Univers [FR]
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since 28 October 2020

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