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Petrogenesis and geochemistry of fayalite and fluorite-bearing granite from the Assam Meghalaya Gneissic Complex, West Khasi Hills, Meghalaya, India: their implication towards Rodinia Supercontinent amalgamation


Affiliations
1 Geological Survey of India, North Eastern Region, Shillong 793 006, India
 

The present study reports fayalite-bearing granite bodies from the Assam–Meghalaya Gneissic Complex of North East India. These are weakly peraluminous with high amounts of alkalis and meagre contents of magnesium, calcium, titanium and phosphorus. The chondrite normalized REE pattern is flat, having minor enrichment of HREE with negative europium anomaly suggesting their A-type character. The discrimination based on Rb, Y, Yb, Nb and Sc content indicates their generation due to melting of crustal components. Early crystallized fayalite and fluorite grains indicate that their emplacement in an extensional tectonic set-up most possibly represents the final stage of Rodinia Supercontinent amalgamation

Keywords

Fayalite and fluorite granite, magmatism, mineral chemistry, petrography, supercontinent amalgamation.
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  • Petrogenesis and geochemistry of fayalite and fluorite-bearing granite from the Assam Meghalaya Gneissic Complex, West Khasi Hills, Meghalaya, India: their implication towards Rodinia Supercontinent amalgamation

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Authors

S. S. Sahoo
Geological Survey of India, North Eastern Region, Shillong 793 006, India
Toshilila
Geological Survey of India, North Eastern Region, Shillong 793 006, India
J. M. Umlong
Geological Survey of India, North Eastern Region, Shillong 793 006, India
S. K. Bharti
Geological Survey of India, North Eastern Region, Shillong 793 006, India
J. K. Naik
Geological Survey of India, North Eastern Region, Shillong 793 006, India
T. Pal
Geological Survey of India, North Eastern Region, Shillong 793 006, India

Abstract


The present study reports fayalite-bearing granite bodies from the Assam–Meghalaya Gneissic Complex of North East India. These are weakly peraluminous with high amounts of alkalis and meagre contents of magnesium, calcium, titanium and phosphorus. The chondrite normalized REE pattern is flat, having minor enrichment of HREE with negative europium anomaly suggesting their A-type character. The discrimination based on Rb, Y, Yb, Nb and Sc content indicates their generation due to melting of crustal components. Early crystallized fayalite and fluorite grains indicate that their emplacement in an extensional tectonic set-up most possibly represents the final stage of Rodinia Supercontinent amalgamation

Keywords


Fayalite and fluorite granite, magmatism, mineral chemistry, petrography, supercontinent amalgamation.

References





DOI: https://doi.org/10.18520/cs%2Fv122%2Fi10%2F1161-1173