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ABSTRACT: Stratigraphic Signatures of the Tectonic and Eustatic Effects During the Post-Rift History of the Tethyan Margin in the Southern Vercors (France)

T. Jacquin, P. R. Vail, H. Arnaud, G. Dardeau, P. Graciansky, M. Lemoine, F. Magniez-Jannin, D. Marchand, C. Ravenne

The stratigraphic record of the southern European peri-tethyan platforms displays numerous major transgressive/regressive facies cycles with a duration of more than 10 m.y. during Mesozoic time. In the sub-Alpine basin, southeastern France, shaly sediments dominate during transgressive phases, and calcareous sediments dominate during regressive phases. These major facies cycles relate to major tectonic events associated with the tethyan passive margin history. It appears that these major facies cycles are formed in time intervals bracketed by periods of significant increases in the rate of tectonic subsidence. They are interpreted as second-order tectonic events (the evolution of the sedimentary basin being of first order).

At a smaller scale, depositional sequences with lowstand, transgressive and highstand Previous HitsystemsNext Hit Previous HittractsNext Hit are recognizable within the major transgressive/regressive facies cycles. They are interpreted to be

caused by third-order eustatic cycles. During periods of high rates of tectonic subsidence, the accommodation space increases on the shelf. Thick transgressive and highstand Previous HitsystemsNext Hit Previous HittractsNext Hit develop. These thick shelfal sequences are characteristic of the transgressive Previous HitphaseNext Hit of the major facies cycles. When the rate of tectonic subsidence decreases, the accommodation space on the shelf also decreases, which greatly enhances the effect of eustatic Previous HitseaNext Hit Previous HitlevelNext Hit falls. During the regressive Previous HitphaseNext Hit of the major facies cycles, depositional sequences develop thick lowstand Previous HitsystemsNext Hit Previous HittractsTop in the basin and major subaerial exposure surfaces on the shelf

AAPG Search and Discovery Article #91003©1990 AAPG Annual Convention, San Francisco, California, June 3-6, 1990