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Prehnitization in the Yahgan Formation of Navarino Island, southernmost Chile

Published online by Cambridge University Press:  14 March 2018

W. A. Watters
W. A. Watters*
Affiliation:
New Zealand Geological Survey, Lower Hutt, New Zealand
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Summary

Upper Mesozoic geosynclinal sedimentary rocks, mainly of volcanic (andesitic) derivation, show widespread prehnitization caused by very low grade metamorphism (burial metamorphism). The sediments, which include greywackes, argillites, cherty rocks, and occasional limestone concretions and thin beds, appear little altered in hand specimen and in the field despite the wide extent of recrystalli-zation. Besides prehnite, secondary minerals include quartz, albite, chlorite, sericite, calcite, and sphene. The different modes of occurrence of the prehnite are described and briefly discussed. The alteration of the rocks is compared with similar wide-spread prehnitization recorded in probably correlative rocks on South Georgia.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 517 - 527
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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