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Architecture of a Deep-water Channel-levee Complex: Channel 3, Castle Creek South, Isaac Formation, Windermere Supergroup, British Columbia, Canada

By
Lilian Navarro
Lilian Navarro
Department of Earth Sciences, University of Ottawa, Ottawa, Ontario, Canada
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Zishann A. Khan
Zishann A. Khan
Department of Earth Sciences, University of Ottawa, Ottawa, Ontario, Canada
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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

Isaac channel 3 in the Castle Creek South study area (Figure 1) exposes a leveed-channel system that is up to 90 m (300 ft) thick and extends at least 1.6 km (1 mi) laterally (Figure 2) (For an overview see Arnott and Ross, chapter 22, this volume). The channel-levee system overlies an areally extensive, up to 80-m (260-ft)-thick, carbonate-clast-rich debrite (D1). Locally, the debrite is overlain by an up to 3-m (10-ft)-thick, sheetlike, coarse-grained, sand-rich, heterolithic assemblage (L0 ) that is interpreted to have been deposited by relatively unconfined, high-density flows. These strata, in addition to topography along the top of the debrite, helped focus subsequent flows that ultimately formed Isaac channel 3.

Isaac channel 3 consists of four channel-fill units (C1 to C4) that stack in a lateral-offset pattern toward the northwest (Figure 2). These fills vary from 7 to 30 m (23–99 ft) thick, and have high net-to-gross (N:G) ratios (70–100%). In their axes, channel-fill strata typically consist of thick-bedded (up to 3 m [10 ft]), massive to graded, pebble conglomerate and very coarse- to medium- grained sandstone, and mudstone-clast breccia that were deposited by high-concentration, gravel- and sand-rich turbidity currents. In the upper part of Isaac channel 3 (C3 and C4), strata near the margin of the channel consist of thick-bedded (up to 1.5 m [up to 5 ft]) amalgamated sandstone that laterally becomes progressively more interbedded with siltstone and very fine- to fine-grained sandstone. These strata were deposited by low- to moderate-concentration flows.

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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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