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Outcrop 14. Tres Pasos Formation Slope Complex, Sierra Dorotea Outcrop Belt

By
S.M. Hubbard
S.M. Hubbard
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A. Fildani
A. Fildani
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Published:
January 01, 2009

Abstract

Outcrop accessibility: easy to moderate Outcrop Coordinates: 51.3696°S, 72.4210°W Refer to outcrop 14 on location map

A thick sandstone package (~350 m) characterizes the Tres Pasos Formation outcrop between Laguna Figueroa and Arroyo Picana along the Puerto Natales-Cerro Castillo highway (Fig. 14.1). Overlying this sandstone package is a succession of mudstone-dominated strata on the order of 1000 m thick. Sierra Dorotea is capped by deltaic deposits of the Dorotea Formation. In the satellite image presented in Figure 14.1, the northern part of Sierra Dorotea, Cerro Sol and Cerro Cazador are featured. The interpreted stratigraphic architecture consists of large-scale slope surfaces (Chingue, Figueroa, and Puma) building southward (the image is oriented along depositional dip). Sandstones of the Tres Pasos Formation at Laguna Figueroa are interpreted as base-of-slope deposits. Conversely, the corresponding topset units are attributed to the shallow-marine Dorotea Formation. Individual slope surfaces are locally identified as resistant ridges in the satellite image (surface length ~30–35 km; surface stratigraphic relief ~1600 m; slope angle ~2.5–3 degrees). A schematic diagram of the architecture in the region is presented inFigure 14.3, incorporating the location of the El Chingue Bluff slope minibasin fill within the regional context (Outcrop 13).

Architectural elements along the lower part of slope surfaces include mud clast-filled bypass channels, channelized sheets and sandstone-filled channels, featured on the following pages.

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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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