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Origin and Correlation of Disconformity Surfaces and Marker Beds, Nahr Umr Formation, Northern Oman

By
Adrian Immenhauser
Adrian Immenhauser
Vrije Universiteit, Earth Sciences, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands.
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;
Wolfgang Schlager
Wolfgang Schlager
Vrije Universiteit, Earth Sciences, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands.
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;
Stephen J. Burns
Stephen J. Burns
Geologisches Institut, Universität Bern, Baltzerstrasse 1, 3012 Bern, Switzerland.
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Robert W. Scott
Robert W. Scott
Precision Stratigraphy Associates, RR 3 Box 103–3, Cleveland, OK 74020, U.S.A.
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;
Tini Geel
Tini Geel
Vrije Universiteit, Earth Sciences, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands.
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Jens Lehmann
Jens Lehmann
Institut für Geologie and Paläontologie, Sigwartstrasse 10, 72076 Tubingen, Germany.
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Sjerry Van Der Gaast
Sjerry Van Der Gaast
Nioz, P.O. Box 591790. AB Den Burg, Texel, The Netherlands.
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Liselotte J. A. Bolder-Schrijver
Liselotte J. A. Bolder-Schrijver
Vrije Universiteit, Earth Sciences, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands.
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Published:
January 01, 2000

Abstract

During Aptian to Albian times a major influx of terrigenous material from the emerged Arabian Shield led to the deposition of the Nahr Umr Formation within the intracratonic Bab Basin. This argillaceous facies interfingers in northern Oman with sediments shed from reefal complexes. We studied a 100 km transect across the zone of facies intercalation extending from the margin of the Neo-Tethys (northern Jabal Akhdar) into the fringes of the Bab Basin in northern Oman (Foothills). The age of formation boundaries and key beds and surfaces in a reference section (Wadi Bani Kharus; I) was dated by use of the graphic correlation method. Graphic correlation indicates that the Nahr Umr Formation is of uppermost Aptian to Upper Albian age. Two types of stratigraphic markers were recognized: limestone marker beds, successions, and disconformity surfaces. Calcareous marker beds are probably related to increased carbonate production during sea-level lowstands. Investigations of the geochemistry (stable isotopes, fluid inclusions) and sediment petrography of limestones beneath disconformities revealed that they are of combined submarine and subaerial origin. Evidence for a subaerial exposure stage is recognized along the basin margin (northern and southern Jabal Akhdar) but is found less frequently in the basinward settings of the Foothills. Marker-bed successions and disconformity surfaces are correlated throughout the sections and indicate coeval deposition of the Nahr Umr Formation in northern Oman.

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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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