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Overview of Mixed Braided- and Leveed-channel Turbidites, West Crocker Fan System, Northwest Borneo

By
Paul D. Crevello
Paul D. Crevello
1BPC Limited, Boulder, Colorado, USA
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Howard D. Johnson
Howard D. Johnson
2Department of Earth Science and Engineering, South Kensington Campus, Imperial College, London, United Kingdom
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Felix Tongkul
Felix Tongkul
3School of Science and Technology, University of Malaysia Sabah,Sepanggar Bay, Kota Kinabalu, Malaysia
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Martin R. Wells
Martin R. Wells
2Department of Earth Science and Engineering, South Kensington Campus, Imperial College, London, United Kingdom
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Published:
January 01, 2008

Abstract

The West Crocker Formation is a major, basin-floor, submarine-fan complex that was deposited in an accretionary foredeep basin during the Oligocene to early Miocene (20–37 Ma) in the South china Sea and adjacent onshore Borneo (Figure 1). This sandstone-dominated succession is several kilometers thick (2.0 m), but may be up to 10 km (6.2 mi). It is more than 25,000 km2 (9652 mi2) in extent, and is exposed across a large part of the coastal ranges of Sabah, east Malaysia (Figures 2, 3). In terms of its size and extent, the West Crocker deep-water turbidite system, which forms part of the Crocker-Rajang fold belt, is comparable to other world-class modern and ancient turbidite systems. However, it is relatively poorly known (Stauffer, 1976; Tongkul, 1987; Crevello, 2002). This study focuses on the nature of the sedimentary facies and high-frequency depositional sequences. It is based on inland outcrops (quarries and road sections) in the vicinity of Kota Kinabalu (Figure 3), where the West Crocker Formation occurs as a series of steeply dipping, north-northeast- to south-southwest-trending, thrust-bounded outcrops. Although thrust faults typically define the bases and tops of the individual outcrop segments, the vertical sections that have been logged for this study are extensive (-150–300 m [492–984 ft] long) and contain only minor internal faulting. Hence, the latter has negligible impact on the interpretation of the stratigraphic elements. The outcrops are aligned along regional strike for -100 km (-62 mi), from north to south,

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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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