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Kanaalkop channel Complex, Kleine Gemsbok Fontein Farm, Tanqua Karoo, South Africa

By
Arnold H Bouma
Arnold H Bouma
Texas A&M University
,
College Station, Texas, USA
Louisiana State University
,
Baton Rouge, Louisiana, USA
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Anne M Delery
Anne M Delery
Anteon Corporation
,
New Orleans, Louisiana, USA
Louisiana State University
,
Baton Rouge, Louisiana, USA
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Erik D Scott
Erik D Scott
Shell EP Europe
,
Aberdeen, United Kingdom
Louisiana State University
,
Baton Rouge, Louisiana, USA
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Published:
January 01, 2008

Abstract

Kanaalkop, located on the Klein Gemsbok Fontein Farm, contains parts of three of the five fans of the Tanqua Karoo. Fans 1 and 2 are thin and represent parts of distal fans. Fan 3, the subject of this paper, occurs in a middle fan location (Figure 1). The Fan 3 outcrop includes a complete channel cross section and levee-overbank deposits of three precursor channels. The most important part of the outcrop, the fill of the upper channel, is 508 m (1667 ft) wide and 19 m (62 ft) thick in the center. The sandstone layers in the axis of the channel are amalgamated. In the channel margins, the fill thins and the sandstone beds become interbedded by shales. The channel center also has two small erosional scours: a 0.75 m (2.5 ft) cut on the left and 0.50 m (1.6 ft) cut on the right. The center of the channel is mostly parallel to the underlying bedding. Thin beds underlie the entire channel complex (Figure 2). Work by Kirkova (1998) indicates that these thin beds represent overbank deposits from three other channels (not present in this outcrop). The three intervals are labeled a, b, and c in Figure 2. Note that there are more thin beds underlying the margins of the main channel where the channel thins laterally. Overall, there are general fining- and thinning-upward trends in these units and there is also an offset (possibly due to compensating bedding) in the thickening and thinning of the thin-bedded units.

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Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

Tor H. Nilsen
Tor H. Nilsen
Desceased
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Roger D. Shew
Roger D. Shew
University of North Carolina
Wilmington, North Carolina
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Gary S. Steffens
Gary S. Steffens
Shell International E&P
Houston, Texas
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Joseph R. J. Studlick
Joseph R. J. Studlick
Maersk Oil America Inc.
Houston, Texas
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810331
Publication date:
January 01, 2008

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