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Sedimentology and Architecture of Coarse-grained, Submarine Channel Fills, Lobitos Village, Peru

By
Erin T Duerichen
Erin T Duerichen
Present address: Devon Energy
,
Houston, Texas, USA
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Donald R. Lowe
Donald R. Lowe
Department of Geological and Environmental Sciences, Stanford University
,
California, USA
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Published:
January 01, 2008

Abstract

Seacliff outcrops in the Paleogene Talara forearc basin of northwestern Peru provide a nearly continuous exposure of a 290-m (951-ft)-thick succession of coarse-grained turbidites of upper Eocene age. Lithofacies include thick, amalgamated conglomerate layers, thick-bedded sandstone layers, and interbedded sandstone and mudstone layers. The basal 210 m (690 ft) is a coarse-grained succession composed of fining-upward packages, averaging 20 m (66 ft) thick, with each package including conglomerates at the base and sandstones at the top. The top 80 m (262 ft) is a finer grained succession of fining-upward packages, each composed of amalgamated sandstone layers at the base and interbedded thin-bedded sandstones and mudstones at the top. Coarse-grained units range from pebble conglomerate to coarse-grained sandstone, are up to 7 m (>3 ft) thick, and often pinch out laterally as a result of erosion by subsequent flows. Unlike most thick-bedded, coarse-grained turbidites, these units are dominated by current-structured, SI turbidite divisions that are often capped by intervals of large-scale cross-stratification (Tt turbidite divisions). The abundance of traction structures, coarse grain size, and abundant scoured contacts indicate that the depositing high-density flows were highly erosive and long-lived, and that large amounts of finer grained sediment probably bypassed to more basinward settings. Overall, the succession fines upward and is interpreted to represent multistory, aggradational, coarse-grained channel-fill deposits overlain by finer grained, smaller channel and associated out-of-channel deposits.

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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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