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Tectonic Setting of the Magallanes Basin, Chile

By
A. Fildani
A. Fildani
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B.W. Romans
B.W. Romans
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S.M. Hubbard
S.M. Hubbard
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J.C. Fosdick
J.C. Fosdick
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Published:
January 01, 2009

Abstract

The Magallanes Basin is a retroarc foreland basin (Suarez and Pettigrew, 1976; Dalziel, 1981; Wilson, 1991: Fildani and Hessler, 2005) and the sedimentary sequence preserved in the Andean fold-thrust belt reflects the early extensional phase of basin evolution and the subsequent contractile phase with eventual uplift associated with Andean orogenesis (Figs. i.1 and i.2). In the latest Jurassic, extension associated with the initial breakup of southern Gondwana (Bruhn, et al., 1978; Gust, et al., 1985; Pankurst, et al., 2000; Calderón et al., 2007) culminated in the development of an oceanic backarc basin referred to as the Rocas Verdes Basin (Katz, 1963). Ophiolitic rocks exposed in the Cordillera Sarmiento, south and west of Parque Nacional Torres del Paine, represent the obducted remains of the floor of this backarc basin (Wilson, 1991; Fildani and Hessler, 2005; Calderón et al., 2007).

Compression associated with the onset of the Andean orogeny resulted in rapid uplift along the western basin margin and concurrent foreland subsidence. A deep-water depositional phase, caused by flexural loading of obducted ophiolitic blocks over the attenuated crust, is marked by the turbidites of the Punta Barrosa Formation (Fig. i.1). The overlying shale-rich Upper Cretaceous Cerro Toro Formation represents the climax of deep-water sedimentation. Conglomerate-filled channel systems (channel belt up to 8 km wide) within the Cerro Toro Formation developed along much

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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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