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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract

Volume: 41 (1957)

Issue: 3. (March)

First Page: 538

Last Page: 564

Title: Cretaceous Flysch and Molasse in Departamento Ultima Esperanza, Magallanes Province, Chile

Author(s): Giovanni O. Cecioni (2)

Abstract:

The Departamento Ultima Esperanza is an ideal place to test the relationship between orogeny and sedimentation, as well as the probable causal relation between orogeny and glaciations. In this study, the presence of sediments with facies of the orogenic Flysch, "Macigno," and Molasse in the Cretaceous of this Departamento is demonstrated. These sediments and their paleontological contents indicate the sub-Hercynian phase, where the pre-kata-epi orogenic stages can be differentiated. The paleo-Andes were erected during the kata-orogenic stage; upon them mountain glaciers were probably developed, and a theory is advanced that they unloaded a great amount of gravel in the trough where the orogenic Flysch was being deposited.

During the late minor orogenic uplift some sediments with Flysch facies again originated, and the "Macigno" was redeposited from highly loaded turbidity currents. At about the same time, the intrusions of the Andean diorite gave origin to laccoliths and perhaps to the Andean batholith. Afterward the molassic sediments filled the geosyncline.

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