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Stratigraphic Architecture and Depositional Evolution of a Levee te Proximal Crevasse-splay to Channel-fill Succession: Units 13 and 14, Castle Creek North, Isaac Formation, Windermere Supergroup, British Columbia, Canada

By
R. W. C. Arnott
R. W. C. Arnott
Department of Earth Sciences, University of Ottawa, Ottawa, Ontario, Canada
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Published:
January 01, 2008

Abstract

High-resolution seismic surveys of many modern deep-water channel systems suggest that channels commonly overlie a genetically related, sheetlike, sand-rich unit termed a high amplitude reflection package (HARP), which is interpreted to be the result of channel avulsion and flow diversion (Hiscott et al., 1997). Because of their sand-prone composition, and sometimes poor conventional core recovery, knowledge of their stratigraphic and lithological attributes is limited (Hiscott et al., 1997). However, at Castle Creek North, a deep-marine channel-fill complex and genetically related subjacent strata are well exposed in rocks of the Windermere Supergroup. At the base of Unit 13, thin-bedded, upper-division turbidites (Tc-e) are interstratified with thicker, coarser grained, more complete turbidites. Respectively, these strata are interpreted to be fine-grained levee and overbank-splay deposits related to an active but not exposed channel. These strata are then overlain abruptly by a 23-m (75-ft)-thick succession consisting of thin-bedded, fine- to medium-grained sandstone Ted turbidites intercalated with medium-bedded, graded (coarse-tailed), structureless, medium-grained sandstone.

This succession is interpreted to be a proximal crevasse splay or HARP deposit related to the avulsion of an adjacent, previously active channel. High-energy turbulent suspensions, now diverted through the levee breach and into the interchannel area, expanded rapidly, lost transport capacity, and incrementally constructed the crevasse splay. Depending on the rate of turbulent suspension collapse, one of two lithofacies were deposited: Ted turbidites were deposited from low-concentration dispersions, whereas structureless sandstone accumulated rapidly from high-concentration suspensions formed in submerged hydraulic jumps (turbidites were deposited from reconstituted dispersions

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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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