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Singh, B. N.
- Geochemistry and Petrogenesis of the Champawat Granitoids Occurring around Dhunaghat, District Pithoragarh, Uttar Pradesh, India
Authors
1 Department of Geology, Kumaun University, Nainital 263 002, IN
2 Geology Laboratory, Department of Civil Engineering, Institute of Technology, Banaras University, Varanasi-221 005, IN
3 Australian Geological Survey Organisation, P. O. Box 378, Canberra City, A.C.T. 2601, AU
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 42, No 3 (1993), Pagination: 289-302Abstract
Early Cambrian Champawat granitoids from Dhunaghat area, emplaced between medium-to high-grade metapelites of the Saryu Formation and low-grade melapelites of the Gumalikhet Formation of the Almora Group, show wide variations in their modal and chemical composition, ranging from granodiorite to granite. Biotite-rich mafic enclaves within the granitoids may represent restile, possibly modified by metasomatism. Chemical data for the calc-alkaline Champwat granitoids show some dcgree of fractional crystallization, although processes such as restite unmixing and different degree of melting may also have been important for the observed variation trends.
The Champwat intrusives are also characterized by enrichment of Y, Zr, Th, U, Nb, La, Ce, Pr and Nd and show affinities with "A"-type (anorogenic) granites.
Keywords
Geochemistry, Petrogenesis, Champawat graniloids, Almora Group, Dhunaghat, District Pithoragarh, Uttar Pradesh.- Geochemistry and Origin of the Granite Gneisses of the Almora Group from Dhunaghat area, District Pithoragarh, U.P.
Authors
1 Geology Laboratory, Department of Civil Engineering, Institute of Technology, Banaras Hindu University, Varanasi - 221 005 (India), IN
2 Department of Geology, Kumaun University, Nainital - 263 002 (India), IN
3 Australian Geological Survey Organisation, P.O. Box 378, Canberra City, A.C.T. 2601 (Australia), AU
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 46, No 1 (1995), Pagination: 27-36Abstract
The Precambrian Almora granite gneisses containing numerous schistose enclaves occuras thick and thin bands within the medium-grade Saryu metasediments of Almora Group. Petrography and major and trace element geochemistry of the granite gneisses indicate that they are strongly peraluminous, S-type granites, and were derived by partial meltingofthe meta-arkose/metapelites.Keywords
Geochemistry, Granite, Dhunaghat, Uttar Pradesh.- Petrology and Geochemistry of the Mount Abu Granites, Southwestern Rajasthan
Authors
1 Applied Geology Laboratory, Department of Civil Engineering, Institute of Technology, Banaras Hindu University, Varanasi -221 005, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 2 (2007), Pagination: 247-252Abstract
The Neoproterozoic mount Abu batholith comprises medium to coarse-grained, grey and pink porphyritic to non-porphyritic biotite granites. ChemicalIy and mineralogically, these are sub-aluminous and potash-rich granites. They are characterized by high SiO2, Na2O + K2O, Fe/Mg, Rb, Nb, Zr, Y, Zn, Ga and Th, and low MgO, Fe2Ot3, CaO and Sr contents, and show close affinity to the A-type granites. High K/Rb, Rb/Sr, Ba/Sr and Ga/Al ratios of these granites are suggestive of crustal origin, which were most likely derived by low-degree partial melting of pre-existing depleted lower crustal source. The mount Abu granites were ernplaced at 650'-700°C at an assumed pressure of around 5 kb.Keywords
Petrology, Geochemistry, A-type granite, Mount Abu granites, Rajasthan.- Petrology and Geochemistry of the Mount ABU Granites, Southwestern Rajasthan
Authors
1 Government Postgraduate College, Sirohi - 307 001, IN
2 Department of Civil Engineering, Banaras Hindu University, Varanasi - 221 005, IN
3 Flat B-203, Block-B, United Avenue Apts., South End, 7-1-29, Ameerpet, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 6 (2007), Pagination: 1372-1375Abstract
No Abstract.- Occurrence of Rhyolitic Dykes within the Mt. Abu Batholith, Southwestern Rajasthan
Authors
1 Geology Laboratory, Department of Civil Engineering, Institute of Technology, Banaras Hindu University, Varanasi- 221 005, IN
2 Department of Geology, Banaras Hindu University, Varanasi - 221 005, IN