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A metamorphosed, layered alpine-type peridotite in the Langavat Valley, South Harris, Outer Hebrides

Published online by Cambridge University Press:  05 July 2018

A. Livingstone
A. Livingstone*
Affiliation:
Department of Geology, The Royal Scottish Museum, Edinburgh, EH1 1JF
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Summary

A layered aipine-type peridotite, of pre-Scourian age(?), has been metamorphosed in the granulite facies then partially retrogressed to greenschist facies assemblages. Following granulite facies metamorphism of the dunite-harzburgite peridotite, granitization and metasomatism modified the peridotite by adding calcium and generated olivine-tremolite rocks. Anthophyllite-rich rocks developed from localized orthopyroxene-rich zones. The main epoch of serpentinization followed after tremolite formation and removed a portion of the calcium previously added, but with negligible effect upon the original trace-element content. Between tremolite generation and the main period of serpentinization greenschist facies assemblages formed. The layered rocks possess a repetitive, chemical variation normally attributable to basic igneous processes, although they may have formed either by vein metasomatism or by metasomatism of a disrupted layered igneous series. Twelve rock and five mineral analyses are presented, and trace element data for twenty-one rocks.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 313 , March 1976 , pp. 493 - 499
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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