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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A032 (1990)

First Page: 27

Last Page: 39

Book Title: SG 30: Deposition of Organic Facies

Article/Chapter: Dysoxic Sedimentation in the Cenomanian-Turonian Daliyya Formation, Israel: Chapter 3

Subject Group: Geochemistry, Generation, Migration

Spec. Pub. Type: Studies in Geology

Pub. Year: 1990

Author(s): S. Lipson-Benitah, A. Flexer, A. Rosenfeld, A. Honigstein, B. Conway, H. Eris

Abstract:

The Daliyya Formation accumulated in four basins near the Cenomanian-Turonian shelf edge of Israel. The formation includes bituminous marls, interbedded black laminated shales enriched in marine organic matter (up to 2.4% TOC), and pyrite, implying oxygen-poor paleoenvironments. The age of the formation, based on foraminifers and ostracodes, is late Early Cenomanian-Late Turonian. The maximum range is found in the southern Gaza basin. Palynological analysis reveals blooms of dinoflagellate cysts. The assemblages suggest subtropical-tropical marine waters. The overall period of dysoxic sedimentation may be divided into three phases (Cenomanian, Cenomanian/Turonian transition, and Turonian) which correspond to, but extend over a longer period than, the global middle Cretace us Oceanic Anoxic Event. The northward migration of the dysoxic facies with time is related to gradual advance of the transgression. Mechanisms involved in the formation and preservation of the organic-rich rocks are discussed for each phase. We suggest that, during the Cenomanian-Turonian transgression, a combination of global oceanic changes--increased upwelling, expansion and intensification of the oxygen-minimum layer, and local oceanographic, climatic, and tectonic conditions--was responsible for the occurrence and distribution of dysoxic sediments. Oxygen depletion affected the microfossil assemblages. The organic-rich facies might be a potential source rock for petroleum.

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