Geochronology and petrochemistry of the Dubha Granite, Sonbhadra District, Uttar Pradesh

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Authors:Dhurandhar, A. P.; Latha, A.; Krishna, V.
Author Affiliations:Primary:
Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Shillong, India
Volume Title:Journal of the Geological Society of India
Source:Journal of the Geological Society of India, 65(4), p.459-467. Publisher: Geological Society of India, Bangalore, India. ISSN: 0016-7622
Publication Date:2005
Note:In English. 33 refs.; illus., incl. geol. sketch map, 4 tables, anals.
Summary: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 1754±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, ilmenite, 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).
Sections:Age determination; Geochemistry; Petrology
Subsections:Igneous rocks
Subjects:Absolute age; Accessory minerals; Alkali feldspar; Amphibole group; Anatexis; Biotite; Chain silicates; Chemical composition; Clinoamphibole; Crust; Dates; Feldspar group; Framework silicates; Geochemistry; Granites; Hornblende; Igneous rocks; Ilmenite; Ion probe data; Isochrons; K-feldspar; Lower crust; Major elements; Mass spectra; Metaluminous composition; Metamorphic rocks; Mica group; Migmatites; Mineral composition; Minor elements; Modal analysis; Oxides; Paleoproterozoic; Petrography; Plagioclase; Plate tectonics; Plutonic rocks; Precambrian; Proterozoic; Quartz; Rb/Sr; Rifting; Sheet silicates; Silica minerals; Silicates; Spectra; Trace elements; Upper Precambrian; Whole rock; X-ray fluorescence spectra; Asia; India; Indian Peninsula; Narmada-Son Lineament; Uttar Pradesh India; Chhotanagpur Gneiss; Dubha Granite; Dudhi Group
Coordinates:N235500 N240500 E0831500 E0830500
Abstract Numbers:05M/1528
Record ID:2005068528
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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