Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Shamim Alam ¹, Syed M. Zainuddin ¹

Affiliations
1 Department of Geology, Aligarh Muslim University, Aligarh 202001, IN

Abstract

Three genetically different types of granites: coarse-grained biotite granite, spotted granite and fine grained granite are recognised. The presence of xenoliths and a significantly high proportion of C-twins, and the presence of oscillatory and normal zoning in plagioclase crystals suggest a magmatic origin. The plots of the three rock types on quartz-albite-orthoclase ternary diagram and the high proportion of albite in K-feldspar indicate a high temperature of crystallization.

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