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Zoisite-clinozoisite relations in low- to medium-grade high-pressure metamorphic rocks and their implications

Published online by Cambridge University Press:  05 July 2018

Masaki Enami  and
Shohei Banno
Masaki Enami
Affiliation:
Department of Earth Sciences, Nagoya University, Nagoya 464, Japan
Shohei Banno
Affiliation:
Department of Earth Sciences, Kanazawa University, Kanazawa 920, Japan
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Summary

Coexisting zoisite and clinozoisite in seventeen specimens from six localities in Japan have been studied with the electron-probe microanalyser. Zoisite and clinozoisite are commonly zoned, but compositional gaps between them are systematic. Referring to the metamorphic grade of the host rocks, a temporary and schematic phase-diagram for the system Ca2Al3Si3O12-(OH)-Ca2Al2Fe3+Si3O12(OH) is presented. With increasing temperature, in the range of low- to medium-grade metamorphism, the compositional gap between the two epidote-group minerals shifts towards higher Fe3+ compositions.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 332 , December 1980 , pp. 1005 - 1013
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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