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Clinopyroxene solid solutions and water in magmas: results in the system phonolitic tephrite-H2O

Published online by Cambridge University Press:  05 July 2018

D. Dolfi  and
R. Trigila
D. Dolfi
Affiliation:
Istituto di Mineralogia e Petrografia, Università di Roma, Rome, Italy
R. Trigila
Affiliation:
Istituto di Mineralogia e Petrografia, Università di Roma, Rome, Italy
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Abstract

Clinopyroxene solid solutions crystallized at Ptot = 2 kbar in the natural system phonolitic tephrite-H2O (lava type from Etna eruption 1971) indicate a linear increase of ln Xcpxcats with H2Oliq %. After coupling this with the In Xcpxcats pressure dependence found through experiments, a simple relation has been set up for clinopyroxene- and plagioclase-bearing magmas. This relation allows us to calculate the amount of water dissolved in the melt, at any known pressure in the crustal range.

Type
Research Article
Information
Mineralogical Magazine , Volume 47 , Issue 344 , September 1983 , pp. 347 - 351
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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