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Mineralogy, geochemistry and geochronology of mafic magmatic enclaves and their significance in evolution of Nongpoh granitoids, Meghalaya, NE India

By
Mohd. Sadiq
Mohd. Sadiq
1
Geological Survey of India, North Eastern Region, Shillong 793003, India
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Ravi K. Umrao
Ravi K. Umrao
1
Geological Survey of India, North Eastern Region, Shillong 793003, India
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B. B. Sharma
B. B. Sharma
1
Geological Survey of India, North Eastern Region, Shillong 793003, India
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S. Chakraborti
S. Chakraborti
1
Geological Survey of India, North Eastern Region, Shillong 793003, India
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S. Bhattacharyya
S. Bhattacharyya
1
Geological Survey of India, North Eastern Region, Shillong 793003, India
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A. Kundu
A. Kundu
2
Geological Survey of India, State Unit: Haryana, NH 5P, NIT, Faridabad 121001, India
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Published:
January 01, 2018

Abstract:

The Cambrian Nongpoh granitoids, intrusive into the Precambrian gneissic complex and metasediments of the Shillong Group, represent a major phase of granitic magmatism in the Shillong Plateau. The Nongpoh granitoids comprise diorite, granodiorite, porphyritic and grey granites. Porphyritic granite is the dominant lithology exposed in the Nongpoh granitoids, and contains three types of enclaves, viz. xenoliths of gneissic rocks, dark grey porphyry and biotite-rich microgranular enclaves. The mafic magmatic enclaves (MMEs) of various dimensions and shapes, including rounded, ellipsoidal, rectangular, angular to subangular, and stretched bodies, were produced by evolving nature and contrasting kinematics of interacting felsic and mafic magmas. The biotite-rich enclaves are due to the injection of syn-magmatic mafic dykes in felsic magma. The various textural assemblages and sub-linear variations between silica and major oxides, chemical mixing and element diffusion suggest that multistage magma hybridization was the key process during the evolution of the Nongpoh granitoids. The 501 Ma age obtained by chemical (U–Th–Pb) dating of monazite in MME ascertained the age of the magma hybridization event in the Nongpoh granitoids, which is equivalent to the igneous activity at 500 Ma during the amalgamation of Eastern Gondwana.

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Geological Society, London, Special Publications

Large Igneous Provinces from Gondwana and Adjacent Regions

S. Sensarma
S. Sensarma
University of Lucknow, India
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B. C. Storey
B. C. Storey
University of Canterbury, New Zealand
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The Geological Society of London
Volume
463
ISBN electronic:
9781786203441
Publication date:
January 01, 2018

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