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Stratigraphy and Sedimentation of the Middle Jurassic, U.A.E.

By
Jose E. De Matos
Jose E. De Matos
Petroprimo, Av. da Republica, 50–4°, 1050 Lisbon, Portugal
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;
Gordon M. Walkden
Gordon M. Walkden
Department of Geology and Petroleum Geology, University of Aberdeen, Meston Bldg, King’s College, Old Aberdeen AB9 2UE, U.K.
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Published:
January 01, 2000

Abstract

Wadi Naqab, SE of Ras Al Khaimah in the U.A.E., exposes an 800 m thick, shallow-water, Middle Jurassic succession. The base of the Bajocian is placed at a sequence boundary a t ca. 460 m above the top Triassic and 45 m beneath the horizon that yielded the ammonite Poecilomorphus sp. The Bajocian/Bathonian contact is marked by the highest occurrence of Haurania deserta. The questionable Bathonian/Callovian boundary either coincides with the last occurrence of Alzonella cuvillieri or is near the base of the Trocholina palastiniensis zone. The last occurrence of Kilianina bianchiti indicates the top of the Callovian. A new Bajocian foraminifer, Pseudodictyopsella jurassica, has been identified.

In Wadi Naqab, the Middle Jurassic corresponds to a broadly shallowing succession comprising multiple, meter-scale, fifth-order cycles. The Bajocian is predominantly subtidal, and cycles are commonly terminated by thick, massive oncoidal/peloidal packstones or grainstones. Most of the Bathonian and Callovian cycles start with spicular wackestones and end with cross-bedded peloidal/oolithic grainstones and/or stromatoporoid/coral rudstones. A direct comparison is established between the Middle Jurassic of Wadi Naqab and the subsurface of the Emirates. In the subsurface of Abu Dhabi, the Bajocian Izhara and Bathonian–Callovian Araej formations are the rock units that make up the Middle Jurassic. As a result of regional comparisons performed in this study, the Izhara Formation is redefined and a new type section proposed.

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SEPM Special Publication

Middle East Models of Jurassic/Cretaceous Carbonate Systems

Abdulrahman S. Alsharhan
Abdulrahman S. Alsharhan
Faculty of Science United Arab Emirates University, P.O. Box 17551, Al Ain, U.A.E.
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;
Robert W. Scott
Robert W. Scott
Precision Stratigraphy Associates, RR3 Box 103-3, Cleveland, OK 74020, U.S.A.
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SEPM Society for Sedimentary Geology
Volume
69
ISBN electronic:
9781565761919
Publication date:
January 01, 2000

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