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The Eskdalemuir tholeiite and its contribution to an understanding of tholeiite genesis

Published online by Cambridge University Press:  14 March 2018

R. B. Elliott
R. B. Elliott*
Affiliation:
Department of Geology, The University, Nottingham
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Summary

The Eskdalemuir tholeiite has the following modal composition: glass 42·2 %, felspar 24·4 %, pyroxene 30·6 %), magnetite 2 %, chlorite 1%. The glass has been separated and analysed. It has 70% SiO2 and is of granitic composition. On a selected triangular diagram the plots of the Eskdalemuir rock, its residual glass, and its crystallinc portion are spread along a narrow belt marking the compositions of the Tertiary tholeiites. Because the differences in the chemical compositions of the phrases of the Eskdalemuir tholeiite are produced by crystallization, it is concluded that the variety of composition of the other Tertiary tholeiites is consistent with a genesis controlled by crystallization differentiation.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 234 , September 1956 , pp. 245 - 254
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1956

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