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Contribution to the study of ore minerals in some igneous rocks from Assynt

Published online by Cambridge University Press:  14 March 2018

E. F. Stumpfl
E. F. Stumpfl*
Affiliation:
University College, London, W.C. L.
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Summary

The parageneses of opaque minerals in three Assynt rocks are described. A biotite-diorite dyke-rock of Lewisian age is characterized by a primary igneous assemblage of Fe-Ti oxides, pyrrhotine, and pentlandite. Effects of metamorphism are recognized, particularly in the oxidation of ilmenite in a Lewisian epidiorite dyke-rock. Cromaltite contains a primary assemblage of oxide minerals together with a later hydrothermal sulphide assemblage. Evidence from the opaque minerals cannot be reconciled with a theory of limestone assimilation. The correlation of the distribution of Co, Ni, and Cu in the rocks with the opaque minerals present is considered.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 253 , June 1961 , pp. 767 - 777
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1961

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