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Paragonite paragenesis from the garnet granulites of the Jijal complex, Kohistan, N. Pakistan

Published online by Cambridge University Press:  05 July 2018

M. Q. Jan ,
R. N. Wilson  and
B. F. Windley
M. Q. Jan
Affiliation:
Department of Geology, University of Peshawar, Peshawar, Pakistan
R. N. Wilson
Affiliation:
Department of Geology, The University, Leicester LE1 7RH, UK
B. F. Windley
Affiliation:
Department of Geology, The University, Leicester LE1 7RH, UK
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Abstract

Chemistry of six white micas from the high-pressure garnet granulites of Jijal is presented, together with trace elements, refractive indices, and 2Vα for one. The micas are rich in the paragonite component (over 93%), with one analysis having the highest 100 Na/(Na + K) ratio (98.5) so far reported. The paragonite is not a stable mineral of the granulites but was overprinted on the granulites at about 505–540°C and 8–9 kbar (suggesting a depth of 30 km).

Type
Research Article
Information
Mineralogical Magazine , Volume 45 , Issue 337 , 1982 , pp. 73 - 77
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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