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Architecture of Lateral-accretion Deposits in Two Stacked, Deep-water, Sinuous Channel Fills: Relationship Between Coarse Channel-fill and Adjacent Inner-bend Levee Deposits, Isaac Channel 2, Castle Creek South, Windermere Supergroup, British Columbia, Canada

By
R. W. C. Arnott
R. W. C. Arnott
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Published:
January 01, 2008

Abstract

The outcrop consists of the inner-bend deposits of two sharp-based, laterally accreting sinuous channels (C1, C2) that are oriented perpendicular and moderately oblique to the outcrop, respectively. Many important channel attributes can be measured because of the perpendicular orientation of C1. Lateral-accretion deposits, although well developed in both channel fills, are inclined at 7–12° to the channel base in C1, and based on geometry, are of the order of 120–140 m (394–460 ft) long. Lateral-accretion deposits show negligible change in grain size along their length or stratigraphically upward (although beds generally thin upward. They consist of subparallel but inclined, decimeter (0.3 ft)-thick beds composed of very coarse-grained sandstone to granule conglomerate grading upward to medium-grained sandstone. Near the updip terminus of each lateral accretion layer, strata are ungraded and distinctively poorly sorted. In addition, traction sedimentary structures, mostly dune cross-stratification, occur in the upper half, or more commonly, upper third of the lateral accretion deposit.

Mudstone (silty slate) is generally absent in all channel fills. Where present, it occurs typically as isolated patches of intraclast breccia in the lower third of the channel fill. These clasts were probably derived from erosion of local mudstone layers, and, as a consequence, coarser grained beds amalgamate in the lower part of the channel fill. At the top of the channel fills, mudstone intertongues with typically very coarse-grained sandstone that thins and pinches out, commonly abruptly, into mudstone. The mudstone interval consists of thinly bedded, single-set-thick, fine-grained sandstone Tc turbidites interstratified with silty mudstone

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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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