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Bulletin de la Societe Geologique de France; July 2007; v. 178; no. 4; p. 275-291; DOI: 10.2113/gssgfbull.178.4.275
© 2007 Societe Geologique de France
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Tectono-biosedimentary recordings at the Lias-Dogger transition: example of the Quercy carbonate platform (Aquitaine Basin, France)

Carine Lezin1, Jacques Rey1, Philippe Faure2, René Cubaynes3, Thierry Pelissie1, Christophe Durlet4 and Jean-François Deconinck4

1 Laboratoire des Mécanismes de Transfert en Géologie, Univ. Toulouse, CNRS, IRD, OMP, 14 avenue Edouard Belin, 31400 Toulouse, France. E.mail: lezin{at}lmtg.obs-mip.fr
2 3, rue Corne Basse, 81100 Castres, France
3 59, chemin Fourestole, 81990 Cambon, France
4 UMR CNRS 5561 "Biogéosciences", Université de Bourgogne, 6 Bd Gabriel, 21000 Dijon, France

On the eastern edge of the Aquitaine Basin, the Lias-Dogger transition and the events, which occurred during this time interval are studied in the Quercy sedimentary basin. Stratigraphic correlations are proposed using a biochronological calibration based on the determination of numerous ammonites and brachiopods. Facies analyses using statistical processing integrate the presence of faults and tectonic compartments and lead to reconstruction of palaeoenvironments in space and time. The paper includes the description of system tracts following Haq et al. [1987] and Vail et al. [1991], and twelve palaeogeographic maps of the area studied. The objectives are to distinguish the various allocyclic and autocyclic factors controlling sedimentation and to show the impact of the Mid-Cimmerian tectonic event on the evolution of the basin.

Key Words: Toarcian • Aalenian • Carbonate platform • Sedimentation • Tectonics • Quercy • France






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