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Pre-caldera Pyroclastic deposits of Deception Island (South Shetland Islands)

Published online by Cambridge University Press:  14 May 2004

J. Martí  and
A. Baraldo
J. Martí
Affiliation:
Instituto de Ciencias de la Tierra (Jaume Almera), c/o Martí i Franqués s/n. 08028 Barcelona, Spain
A. Baraldo
Affiliation:
Instituto Antártico Argentino, Cerrito 1248, Buenos Aires, Argentina.
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Abstract

The youngest pre-caldera volcanism of Deception Island is represented by a thick sequence of subaerial pyroclastic deposits which has been grouped as the Yellow Tuff Formation. Most of these deposits were related to the explosive activity of a central vent which was destroyed during the formation of the caldera. Two members can be distinguished in this formation. The lower member is mainly composed of 1 to 12 m thick massive pyroclastic flow deposits with interbedded air-fall and surge deposits. The upper member is in stratigraphical continuity with the lower member and consists of base surge deposits with minor air-fall and thin pyroclastic flow deposits. The pre-caldera deposits have undergone a palagonitic alteration which produced crystallization of smectites, Fe-oxides, zeolites and calcite.

Keywords

base surgeshydrovolcanismpalagonitizationpyroclastic flows
Type
Papers—Earth Sciences And Glaciology
Information
Antarctic Science , Volume 2 , Issue 4 , December 1990 , pp. 345 - 352
Copyright
© Antarctic Science Ltd 1990

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