Magmatic epidote in the Grenvillian granitoids of North Purulia Shear Zone, Chhotanagpur Gneissic Complex, India and its significance

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 kba...

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Bibliographic Details
Published in:Current science (Bangalore) 2019-07, Vol.117 (2), p.298-303
Main Authors: Basak, Ankita, Goswami, Bapi, Singha, Ananya, Das, Somshubhra, Bhattacharyya, Chitta
Format: Article
Language:English
Subjects:
RESEARCH COMMUNICATION
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Summary: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.
ISSN:0011-3891
DOI:10.18520/cs/v117/i2/298-303