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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:
R. Marocco, A. Lavenu, and R. Baudino 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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Intermontane
Late Paleogene-Neogene Basins of the Andes of Ecuador and Peru: Sedimentologic
and Tectonic Characteristics
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R. Marocco
ORSTOM
Paris, France
A. Lavenu
ORSTOM
Université de
Pau
Pau, France
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R. Baudino
Laboratoire de Modélisation
des Bassins Sédimentaires
Université de
Pau
Pau, France
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Abstract
An important
characteristic of Neogene basin evolution in the Andean Cordillera was
the formation of intermontane basins. These basins were initiated in the
late Oligocene with reactivation of Andean tectonism and were abandoned
in the latest Miocene (about 7 Ma). Their sedimentary fill and structures
record the Neogene tectonic history. The sedimentary fill of these basins
comprises two megasequences. The first consists of fluvial and overlying
lacustrine deposits attributed to basin opening. The second is composed
essentially of proximal fluvial sedimentary units and reflects the closure
of the basins in the latest Miocene.
Structural analysis of the
Neogene basins shows that their evolution was controlled by the regional
tectonic stress. Synsedimentary folding and fracturing show that the direction
of stress experienced a clockwise rotation in the Neogene, thus explaining
variations in the behavior of the faults bordering the basins as well as
the different stages of their evolution. |
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