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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A032 (1990)

First Page: 107

Last Page: 118

Book Title: SG 30: Deposition of Organic Facies

Article/Chapter: Global and Regional Controls on Potential Source-Rock Deposition and Preservation: The Cenomanian-Turonian Oceanic Anoxic Event (CTOAE) on the European Tethyan Margin (Southeastern France): Chapter 8

Subject Group: Geochemistry, Generation, Migration

Spec. Pub. Type: Studies in Geology

Pub. Year: 1990

Author(s): Jean-Pierre Crumiere, Christine Crumiere-Airaud, Jean Espitalie, Pierre Cotillon

Abstract:

On the European margin of the Tethys Ocean, late Cenomanian to early Turonian sea-level rises resulted in a progressive drowning of the Provence rudist-bearing platform, successive breaks in marine sedimentation, and the initiation of deep-water disaerobic conditions in the whole pelagic domain of the Vocontian Basin. Paleogeographic and structural features may have controlled the regional extent of oxygen-minimum layers, the distribution of laminated and organic-rich sediments, and the regional duration of such a worldwide Oceanic Anoxic Event. Sporadic modifications in the water stratification, perhaps due to climatic changes, induced high-frequency changes of the deep-water redox conditions. These changes probably caused short-term fluctuations in the thickness of the xygen-minimum layers and the ecological perturbations recorded in the deep-water-dwelling planktonic and benthic biota. Periodic disaerobic conditions, which protected the sediments from oxidizing benthic activity, are thought to be the main cause of relative concentrations of hydrocarbon-rich amorphous organic matter found in these potential source rocks.

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