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Deep-water Channel Margin Architecture, Cerro Toro Formation, Cerro Mocha, chile

By
Stephen M. Hubbard
Stephen M. Hubbard
Department of Geological and Environmental Sciences, Stanford University, Stanford, California, USA
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Brian W. Romans
Brian W. Romans
Department of Geological and Environmental Sciences, Stanford University, Stanford, California, USA
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Stephan A. Graham
Stephan A. Graham
Department of Geological and Environmental Sciences, Stanford University, Stanford, California, USA
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Published:
January 01, 2008

Abstract

Conglomeratic deep-water deposits of the Cerro Toro Formation are exposed for more than 100 km (62 mi) along a north–south trending outcrop belt in the Ultima Esperanza District of southern chile. The deposits accumulated within a broad channel belt (4–5 km [2.5–3.1 mi] wide) that occupied the axis of the Magallanes basin during the Late Cretaceous (Campanian). The elongate depocenter represented the foredeep to the fold-thrust belt presently exposed in the stucturally complex Patagonian Andes to the west of the study area. The Andes were actively uplifting during deposition of the Cerro Toro Formation, and have been interpreted to represent the source of the coarse-grained channel fill. Outcrops of the Cerro Toro Formation have long been studied as architectural analogs to hydrocarbon reservoirs, although the outcrop at Cerro Mocho that is the focus of this paper has not been documented before. The exceptional, seismic-scale exposure of the western channel margin at Cerro Mocho is an ideal place to document the relationship between conglomeratic channel fill and fine-grained, out-of-channel deposits. Structures associated with Andean tectonics are present in the study area but do not significantly hinder sedimentologic and stratigraphic interpretations.

The channel margin at Cerro Mocho is complex, shaped by both constructional and erosional processes. Total relief of the margin is almost 300 m (984 ft) over a lateral distance of 1 km (0.6 mi). Deposition of predominantly sand and gravel in the channel axis was influenced by erosive gravity flows and traction processes (driven by overlying turbidity currents). Beds near

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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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