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Ray, Soumya
- Geochemical and Petrogenetic Study of Proterozoic Sewariya and Govindgarh Granitoids from South Delhi Fold Belt
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Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi 110 007, IN
1 Department of Geology, University of Delhi, Delhi 110 007, IN
Source
Current Science, Vol 109, No 8 (2015), Pagination: 1458-1465Abstract
The present study reports the geochemical composition of Sewariya two-mica granites (SG) and Govindgarh granites (GG) intruding rocks of Delhi Supergroup along the western margin of South Delhi Fold Belt in Rajasthan, India. Both granite varieties are highly evolved possessing high SiO2, Al2O3, low MgO, CaO, Fe2O3, Ni, Cr and V and are calc-alkaline in nature. In chondrite normalized REE diagrams, SG are characterized by highly fractionated REE patterns (avg LaN/ YbN = 21.45) and sharp negative Eu* anomaly (Eu/Eu* = 0.25), whereas GG do not show significant REE fractionated patterns (avg LaN/YbN = 3.31) and have variable Eu anomalies. From primitive mantle normalized multi-element diagrams, crustal signatures (low Nb, Ti and high Pb, U, Th) can be inferred for both the granitoid varieties. Also, strong peraluminous nature, high A/CNK, normative corundum and abundant mica content point towards a (meta)sedimentary protolith for them. An arc setting is indicated by their calc-alkaline nature; volcanic arc or syncollisional affinities in tectonic discriminant diagrams (Nb versus Y; Rb versus Nb + Y). They are peraluminous leucogranites derived from crustal melts with little mantle contribution as is evident from their mineralogy and geochemical characteristics. The anatectic conditions prevalent during the formation of these granites differed with SG being formed under dehydration conditions, while the formation of GG involved fluid-present melting reactions.Keywords
Geochemistry, Granitoid Magmatism, Petrography, Peraluminous Leucogranites.Full Text
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- Geochemistry of Pegmatites from South Delhi Fold Belt: A Case Study from Rajgarh, Ajmer District, Rajasthan
Abstract Views :245 |
PDF Views:100
Authors
Affiliations
1 Department of Geology, University of Delhi, Delhi 110 007, IN
1 Department of Geology, University of Delhi, Delhi 110 007, IN
Source
Current Science, Vol 106, No 12 (2014), Pagination: 1725-1730Abstract
On the basis of geochemical studies, pegmatites emplaced in the Rajgarh Group of Delhi Supergroup in the South Delhi Fold Belt have been classified into three groups. They show a variety of rare earth element enrichment patterns, LREE/HREE values and Eu anomalies. The geochemical affinities of these pegmatites suggest their calc-alkaline nature, volcanic arc granite signature in tectonic discrimination diagrams (Nb vs Y and Rb vs Nb + Y) and a probable S-type parentage as inferred from their high A/CNK value, peraluminous character, presence of high normative corundum and abundance of garnet and muscovite. These features have been related to subductionrelated processes which might have generated the parent granitic melt forming these pegmatites.Keywords
Geochemical Studies, Granitic Melt, Pegmatites, Subduction.Full Text