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Partial melting of feldspathic quartzite around late Caledonian minor intrusions in Appin, Scotland

Published online by Cambridge University Press:  01 May 2009

I. M. Platten
I. M. Platten
Affiliation:
Department of Geology and GeographyCity of London PolytechnicWalburgh HouseBigland StreetLondon E1 2NG
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Summary

Granophyre patches on the sites of former sedimentary feldspars in the feldspathic Appin Quartzite show that partial melting took place in the inner parts of the aureoles of late Caledonian minor intrusions. Mobilization of the melt and refractory quartz residue as a thixotropic suspension is shown to result in the formation of veins and breccias. Textures are related to the wetting of quartz/quartz grain bounderies by the eutectic melt and the later growth of crystals during cooling. From the presence of high (β) quartz coexisting with melt, minimum contact temperatures are estimated as 780°C, showing that some convective circulation of magma took place.

Type
Articles
Information
Geological Magazine , Volume 119 , Issue 4 , July 1982 , pp. 413 - 419
Copyright
Copyright © Cambridge University Press 1982

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