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Partition coefficients of alkali and alkaline-earth elements between alkali feldspar phenocrysts and their lava matrix

Published online by Cambridge University Press:  05 July 2018

Renzo De Pieri  and
Sergio Quareni
Renzo De Pieri
Affiliation:
Istituto di Mineralogia e Petrologia dell'Università, Corso Garibaldi 37 35100 Padova, Italy
Sergio Quareni
Affiliation:
Istituto di Mineralogia e Petrologia dell'Università, Corso Garibaldi 37 35100 Padova, Italy
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Summary

Plots of partition coefficients (mineral/ matrix) against ionic radius of the alkali and alkaline earth elements in forty-four alkali feldspars from rhyolites and trachytes show two kinds of diagram, one for homogeneous alkali feldspars with a single peak, and the other for cryptoperthites with a wide spread of points, which cannot represent a single peak, but may probably be explicable in terms of two peaks. The difference in behaviour does not seem to be due to the chemical composition, but is apparently related to the crystallo-graphic features of the alkali feldspar structures. In particular the presence of two peaks in the diagrams of the cryptoperthites seems to be due to the existence of lattice positions suited to receive bigger ions (K, Ba, Rb) and smaller ions (Na, Ca, Sr) in the potassic and sodic domains.

Type
Research Article
Information
Mineralogical Magazine , Volume 42 , Issue 321 , March 1978 , pp. 63 - 67
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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