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Facies analysis of the Lo Valdés Formation (Tithonian–Hauterivian) of the High Cordillera of central Chile, and the palaeogeographic evolution of the Andean Basin

Published online by Cambridge University Press:  01 May 2009

A. Hallam ,
L. Biró-Bagóczky  and
E. Perez
A. Hallam
Affiliation:
Department of Geological Sciences, University of Birmingham, Birmingham B15 2TT, U.K.
L. Biró-Bagóczky
Affiliation:
Departamento de Geociencias, Universidad de Concepción, Concepción, Chile
E. Perez
Affiliation:
Servicio Nacional de Geologia y Mineria, Santiago, Chile
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Abstract

Facies descriptions and environmental interpretations are given for outstanding sections of marine Tithonian to Hauterivian strata in the High Cordillera of the central Chilean Andes. Comparisons are made with correlative strata in other regions in Chile, and with the Neuquén Basin of west central Argentina. The rich and partly endemic bivalve fauna, which has strong African affinities, shows no change up the stratigrapic sequence that cannot be related to local facies. Water depth is recognized as the main variable controlling the distribution of the bivalve and ammonite faunas. Utilizing data from both Chile and Argentina, a model is put forward for the late Jurassic to mid Cretaceous sequence whereby the facies distributions are accounted for by the interaction of global sea-level changes and regional tectonics in a shallow back-arc basin.

Type
Articles
Information
Geological Magazine , Volume 123 , Issue 4 , July 1986 , pp. 425 - 435
Copyright
Copyright © Cambridge University Press 1986

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