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Facies and Internal Architecture of Deep-water Channel Fill in the Cerro Toro Formation, Sarmiento Vista, 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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Tzvetina Erohina
Tzvetina Erohina
Department of Geological and Environmental Sciences, Stanford University, Stanford, California, USA
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Donald R. Lowe
Donald R. Lowe
Department of Geological and Environmental Sciences, Stanford University, Stanford, California, USA
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Published:
January 01, 2008

Abstract

Outcropping strata of the Cerro Toro Formation at Sierra del Toro (Sarmiento Vista outcrop), southern chile, highlight the internal complexity associated with submarine channel deposits. The outcrop exposures consist of facies deposited in an elongate fan-channel complex, greater than 100 km (62 mi) long, that occupied the axis of the Magallanes foreland basin during the Late Cretaceous (Campanian). Paleocurrent data indicate that flow was dominated by southward-directed axial currents. Based on the distribution of multiple, large-scale, channelized depositional elements in the outcrop belt, the deposits at Sarmiento Vista are interpreted to represent one of numerous feeder channels that debouched into the channel complex (Figure 1). The entire channelform depositional element studied is <1 km (<0.6 mi) wide through the bottom part of the succession. However, a marked broadening of the channel is apparent at the top of the interval where the topmost beds extend over a lateral distance of at least 2.5 km (1.6 mi). The outcrop is oriented perpendicular to the paleochannel axis and exhibits 180 m (590 ft) of total relief over a lateral distance of approximately 250 m (820 ft). Fine-grained, out-of-channel deposits are mostly covered by vegetation and scree, limiting detailed interpretation of the channel margins.

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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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