Large Igneous Provinces from Gondwana and Adjacent Regions
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Mineralogy, geochemistry and geochronology of mafic magmatic enclaves and their significance in evolution of Nongpoh granitoids, Meghalaya, NE India
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Published:January 01, 2018
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CiteCitation
Mohd. Sadiq, Ravi K. Umrao, B. B. Sharma, S. Chakraborti, S. Bhattacharyya, A. Kundu, 2018. "Mineralogy, geochemistry and geochronology of mafic magmatic enclaves and their significance in evolution of Nongpoh granitoids, Meghalaya, NE India", Large Igneous Provinces from Gondwana and Adjacent Regions, S. Sensarma, B. C. Storey
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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.
- absolute age
- amalgamation
- amphibole group
- Asia
- Cambrian
- chain silicates
- chemical composition
- chemical properties
- crystallization
- dikes
- diorites
- electron microscopy data
- electron probe data
- felsic composition
- field studies
- genesis
- Gondwana
- granite porphyry
- granites
- granitic composition
- granodiorites
- hybridization
- igneous rocks
- inclusions
- India
- Indian Peninsula
- intrusions
- mafic composition
- mafic magmas
- magmas
- magmatism
- Meghalaya India
- metals
- mineral assemblages
- mineral composition
- monazite
- Northeastern India
- outcrops
- Paleozoic
- petrography
- phosphates
- plutonic rocks
- plutons
- rare earths
- SEM data
- Shillong Plateau
- silicates
- statistical analysis
- textures
- trace elements
- U/Th/Pb
- variations
- xenoliths
- Nongpoh Granitoids