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Mawpyut intrusive complex of Jaintia hills district, Meghalaya, northeastern India: A case study for magmatic differentiation
S CHAUDHURI, R SAHA, , S K BHADURI
Published in SPRINGER INDIA
2009
Volume: 74
   
Issue: 3
Pages: 385 - 394
Abstract
The petrological details of the ultramafic-mafic-alkaline complex related to Sylhet Trap occurring near to Mawpyut (25°25'N:92°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 mela-gabbro-norite) 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. © GEOL. SOC. INDIA.
About the journal
JournalData powered by TypesetJournal of the Geological Society of India
PublisherData powered by TypesetSPRINGER INDIA
ISSN0016-7622
Open AccessNo