Mawpyut intrusive complex of Jaintia hills distric

Authors: Srinanda Chaudhuri Rajarshi Saha Jyotisankar Ray S K Bhaduri

Publish Date: 2009/10/09

Volume: 74, Issue: 3, Pages: 385-

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Abstract

The petrological details of the ultramaficmaficalkaline complex related to Sylhet Trap occurring near to Mawpyut 25°25′N92°10′E of Jaintia hills district Meghalaya northeastern India are poorly known Field investigations indicate that the Mawpyut body occurs as a pluton distinctly intrusive into adjacent low grade metasedimentary Shillong Group of rocks This body reveals development of two broad lithotypes namely ultramafic olivine clinopyroxenite clinopyroxenite and plagioclase bearing ultramafic and mafic mostly gabbro orthopyroxene gabbro olivine gabbronorite mela gabbro and melagabbronorite with minor presence of later syenitic veins Though in general the pluton shows mineralogical variations the field boundaries among those petrographic types are not discernible Careful consideration of major and trace element chemistry of the constituent lithomembers clearly suggest progressive insitu fractionation of a common parent magma

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