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Outcrop 8. Channel Margins in the Cerro Toro Formation, Cordillera Manuel Señoret

By
S.M. Hubbard
S.M. Hubbard
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B.W. Romans
B.W. Romans
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Published:
January 01, 2009

Abstract

Outcrop accessibility: variable Outcrop Coordinates: 51.4716°S, 72.6508°W Refer to outcrop 8 on location map

Conglomeratic deposits of the Cerro Toro Formation attributed to deposition in a large-scale basin axial channel belt are well exposed in the Cordillera Manuel Señoret, north of Puerto Natales between Cueva del Milodon and Lago Toro. The conglomeratic succession is informally called the “Lago Sofia Member” because of the presence of Laguna Sofia in this area (Scott, 1966). The large injectite complex that is the focus of Chapter 9 is present in the Cordillera Manuel Señoret on the south shore of Lago Sofia (Fig. 8.1A).

The channel belt is characterized by low sinuousity, demonstrated with outcrop mapping and the collection of extensive paleocurrent data (Fig. 8.1A). Outcrop exposures of the channel belt margin are present on the north faces of Cerro Benitez and Cerro Mocho (Fig. 8.1B, C). Because of poor accessibility, the margin at Cerro Mocho cannot be easily visited.

A levee interpretation for fine-grained material adjacent to the channel belt is based on a series of key observations: (i) paleocurrent measurements indicative of flow divergence (50° to 100°) measured from out-of-channel units as compared to those taken from inside the channel belt container; (ii) progressive thinning of sandstone beds away from the channel belt margin; (iii) evidence that the eroded channel margin was poorly indurated, including a stepped profile and injection of channel fill into out-of-channel strata; (iv) deposits that record slumping on the

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SEPM Field Trip Guidebook

Stratigraphic Evolution of Deep-Water Architecture: Examples of controls and depositional styles from the Magallanes Basin, southern Chile

Andrea Fildani
Andrea Fildani
Chevron Energy Technology Company, USA
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Stephen M. Hubbard
Stephen M. Hubbard
Department of Geoscience, University of Calgary, Canada
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Brian W. Romans
Brian W. Romans
Chevron Energy Technology Company, USA
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J.A. Covault
J.A. Covault
Chevron Energy Technology Company, USADepartment of Geological and Environmental Sciences, Stanford University, USA
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W.H. Crane
W.H. Crane
Chevron Energy Technology Company, USA
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A. Bernhardt
A. Bernhardt
Department of Geological and Environmental Sciences, Stanford University, USA
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Z.R. Jobe
Z.R. Jobe
Department of Geological and Environmental Sciences, Stanford University, USA
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D.A. Armitage
D.A. Armitage
Department of Geological and Environmental Sciences, Stanford University, USA
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J.C. Fosdick
J.C. Fosdick
Department of Geological and Environmental Sciences, Stanford University, USA
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M.R. Shultz
M.R. Shultz
Chevron Energy Technology Company, USA
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J. Clark
J. Clark
Chevron Energy Technology Company, USA
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D.R. Lowe
D.R. Lowe
Department of Geological and Environmental Sciences, Stanford University, USA
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S.A. Graham
S.A. Graham
Department of Geological and Environmental Sciences, Stanford University, USA
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SEPM Society for Sedimentary Geology
Volume
10
ISBN electronic:
9781565762923
Publication date:
January 01, 2009

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