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On the chemistry of pillow lavas and the origin of spilites

Published online by Cambridge University Press:  14 March 2018

T. G. Vallance
T. G. Vallance*
Affiliation:
Geology Dept., University of Sydney
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Summary

Twenty-five new analyses of 10 spilitic pillows from the British Isles offer evidence of considerable variability in distribution of components, notably Si, Na, Mg.Fe2+, Ca, Fe3+, and water. Selvedges of pillows have compositions strongly contrasted with but essentially complementary to those of cores. Redistribution of components is believed to have occurred during devitrification. Geosynclinal spilites are regarded as basalts which have suffered such redistribution under conditions of diagenesis or low-grade metamorphism.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 471 - 481
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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