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Influence of Tectonics on Submarine Fan Deposition, Tanqua and Laingsburg Subbasins, South Africa

By
Erik D. Scott
Erik D. Scott
BHP Petroleum, Houston, Texas, U.S.A.
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Arnold H. Bouma
Arnold H. Bouma
Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana, U.S.A.
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H. DeVille Wickens
H. DeVille Wickens
Kuils River, South Africa
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Published:
January 01, 2000

Abstract

The Permian Tanqua and Laingsburg subbasins in the southwestern Karoo Basin, South Africa, had near-contemporaneous formation and filling. Five submarine fan systems are in the broad, shallow Tanqua subbasin and four in the more typical foredeep-style Laingsburg subbasin. Petrologic and micro-probe analysis of the sandstones indicates a distant source area. Tectonic events led to varying sea-floor topography that directed sediment transport to the subbasins. Tectonic activity was low to nonexistent during deposition of any one or more of the submarine fans and indicates that the depositional cycle is much shorter than a tectonic cycle. The tectonic style of a basin may not always define the sedimentary characteristics of turbidite systems deposited in that basin.

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Contents

AAPG Memoir

Fine-Grained Turbidite Systems

Arnold H. Bouma
Arnold H. Bouma
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Charles G. Stone
Charles G. Stone
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American Association of Petroleum Geologists
Volume
72
ISBN electronic:
9781629812625
Publication date:
January 01, 2000

GeoRef

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