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Abstract
Chapter from: M
62: Petroleum Basins of South America
Edited by
A. J. Tankard, R. Suarez Soruco, and H. J. WelsinkAuthors:
M. A. Cooper, F. T. Addison, R. Alvarez, A. B. Hayward,
S. Howe, A. J. Pulham, and A. Taborda Basin and Aerial Analysis/Evaluation
Published 1995 as
part of Memoir 62
Copyright © 1995 The American Association of Petroleum
Geologists. All Rights Reserved. |
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Basin
Development and Tectonic History of theLlanos Basin, Colombia
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M. A. Cooper
F. T. Addison
R. Alvarez
A. B. Hayward
S. Howe
A. J. Pulham
A. Taborda
BP Exploration (Colombia)
Ltd.
Bogotá, Colombia
Abstract
The Llanos basin
lies east of the Eastern Cordillera in northeastern Colombia. Basin development
commenced with a Triassic-Jurassic synrift megasequence related to the
separation of North and South America in the Caribbean. Basin development
continued in the Cretaceous as a back-arc megasequence behind the Andean
subduction zone. Marine deposition was abruptly terminated during the early
Maastrichtian due to final accretion of the Western Cordillera.
The accretion of the Western
Cordillera created the pre-Andean foreland basin megasequence (Paleocene-early
Miocene), which covered the Magdalena Valley, Eastern Cordillera, and Llanos
basin. This megasequence is dominated by fluviodeltaic strata. The overlying
Andean foreland basin megasequence commenced with deformation in the Central
Cordillera and Magdalena Valley. The Andean foreland basin megasequence
also includes the Guayabo Formation, which is a classic molasse sequence
shed from the developing mountains of the Eastern Cordillera as deformation
moved eastward into the Llanos foothills. The deformation in the Llanos
foothills is a combination of inversion of preexisting extensional faults
and thin-skinned thrusting. |
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