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Latha, A.
- Geochronology and Petrochemistry of the Dubha Granite, Sonbhadra District, Uttar Pradesh
Authors
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Shillong- 793 01 1, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 4 (2005), Pagination: 459-467Abstract
The Rb-Sr isotopic systematics and petrochemistry of Dubha Granite occurring in the migmatite complex of Chhotanagpur Granite Gneiss Complex (CGGC) in parts of Sonbhadra district, Uttar Pradesh have been investigated.The Rb-Sr data on the whole rock samples (n=13) yields an isochron age of 17545±166 Ma with initial 87Sr/86Sr ratio of 0.7043±0.011.
The Dubha Granite is composed of quartz (34.2%), K-feldspar (37.4%), plagioclase (An2-40) (16.1%), biotite (9.6%), hornblende (1.9%), and accessory garnet, sphene, apatite, zircon, anatase, ilrnenite, magnetite, goethite, and chalcopyrite (0.8%). It is an anorogenic, metaluminous, ilmenite series, rift related granite, enriched in Ni, Cr, Co, V, Zn, Cu, Rb, Ba, Zr, Nb, Ce, U, Th and depleted in Sr and Y as compared to the normal granite. The Dubha Granites may have been generated by the anatexis of lower crustal material in the vicinity Son Narmada South Fault (SNSF).