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Paragenesis of staurolite in pelitic schists of Kishangarh, District Ajmer, India

Published online by Cambridge University Press:  05 July 2018

R. K. Lal  and
R. S. Shukla
R. K. Lal
Affiliation:
Department of Geology, Banaras Hindu University, Varanasi, India
R. S. Shukla
Affiliation:
Department of Geology, Banaras Hindu University, Varanasi, India
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Summary

The staurolite-bearing schists of the area were metamorphosed in the staurolite-kyanite zone of the amphibolite facies. The various assemblages of the pelitic schists are represented in the AKF and Thompson's AFM diagrams. Within the PT conditions of stability of staurolite, this mineral develops in pelitic schists that have a high Al2O3 (excess)/(K2O+FeO+MgO) ratio so that the plots of analyses lie above the muscovite-garnet join in the AKF diagram. The three-phase field of staurolite-kyanite-biotite in the AFM diagram migrates towards the lower FeO/MgO side with increasing oxidation ratio and thus staurolite-bearing rocks are not necessarily restricted to pelitic schists with high FeO/MgO ratio as is commonly believed. On the other hand, the three-phase field shifts towards the higher FeO/MgO side with increasing grade of metamorphism assuming oxidation ratio and pressure to be constant, thus reducing the composition field of staurolite schists in the AFM diagram.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 289 , March 1970 , pp. 561 - 567
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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