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Chlorites from granitic rocks of the central Sierra Nevada batholith, California

Published online by Cambridge University Press:  05 July 2018

F. C. W. Dodge
F. C. W. Dodge*
Affiliation:
U.S. Geological Survey, Menlo Park, California 94025, U.S.A.
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Summary

Occurrence and major- and minor-element compositions of chlorites from plutonic rocks of the central Sierra Nevada batholith have been studied in detail.

Chlorite has formed largely as an alteration product of biotite, presumably late in the magmatie history of the granitic rocks as a result of subsolidus reaction. Major-element composition of chlorite is strongly influenced by composition of coexisting biotite. Minor-element differences between the two minerals can, for the most part, be attributed to structural differences. The minor-element data, particularly for Cu, indicate that the process of chloritization is not a likely mechanism for release of ore metals from primary minerals.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 301 , March 1973 , pp. 58 - 64
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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