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Magmatic Epidote in the Grenvillian Granitoids of North Purulia Shear Zone, Chhotanagpur Gneissic Complex, India and its Significance


Affiliations
1 Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700 019, India
 

Magmatic epidotes of granitoid pluton from North Purulia Shear Zone, eastern India, are identified by textural and chemical criteria. The accessory sphene, epidote, allanite and magnetite in the granitoid indicate high fO2 during crystallization. Hornblendes were crystallized between 1.2 and 4.8 kbar, 753°C and 783°C as well as high fO2 (>Ni–NiO buffer). Preservation of magmatic epidote in pluton emplaced at low pressure is due to rapid magma ascent (>3.1 km/year). Fast upward transportation of parental magma of the pluton took place through extensional voids along the regional shear zone.

Keywords

Granitoids, Magmatic Epidote, Oxygen Fugacity, Shear Zone Emplacement.
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  • Magmatic Epidote in the Grenvillian Granitoids of North Purulia Shear Zone, Chhotanagpur Gneissic Complex, India and its Significance

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Authors

Ankita Basak
Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700 019, India
Bapi Goswami
Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700 019, India
Ananya Singha
Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700 019, India
Somshubhra Das
Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700 019, India
Chitta Bhattacharyya
Department of Geology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata 700 019, India

Abstract


Magmatic epidotes of granitoid pluton from North Purulia Shear Zone, eastern India, are identified by textural and chemical criteria. The accessory sphene, epidote, allanite and magnetite in the granitoid indicate high fO2 during crystallization. Hornblendes were crystallized between 1.2 and 4.8 kbar, 753°C and 783°C as well as high fO2 (>Ni–NiO buffer). Preservation of magmatic epidote in pluton emplaced at low pressure is due to rapid magma ascent (>3.1 km/year). Fast upward transportation of parental magma of the pluton took place through extensional voids along the regional shear zone.

Keywords


Granitoids, Magmatic Epidote, Oxygen Fugacity, Shear Zone Emplacement.

References





DOI: https://doi.org/10.18520/cs%2Fv117%2Fi2%2F298-303