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Feldspars and fluids in cooling plutons

Published online by Cambridge University Press:  05 July 2018

Ian Parsons
Ian Parsons*
Affiliation:
Department of Geology and Mineralogy, University of Aberdeen, Aberdeen AB9 1AS, Scotland
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Summary

Alkali feldspars in plutonic igneous rocks vary both in their exsolution textures and in the structural state of their components. The primary factor leading to this diversity is the availability of hydrothermal fluids during their cooling history. In many plutons feldspar variation is related to degree of fractionation as indicated by rock chemistry. The variation reflects build-up of water with magmatic evolution and implies that fluids did not circulate freely in the intrusives in the temperature range of unmixing and ordering. Experimental work bearing on the role of fluids in subsolidus changes in feldspars is reviewed, and points of overlap between crystallographic studies of feldspars and stable isotope studies are discussed.

Type
Research Article
Information
Mineralogical Magazine , Volume 42 , Issue 321 , March 1978 , pp. 1 - 17
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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