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Geochemistry and petrogenesis of acid volcano-plutonic rocks of the Siner area, Siwana Ring Complex, Northwestern Peninsular India

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Journal of the Geological Society of India

Abstract

Petrochemical studies on acid plutonic (granite, microgranite) and volcanic (rhyolite, trachyte) rocks occurring in the Siner area of the Siwana Ring Complex, Malani Igneous Suite have been carried out. These rocks are characterized by high concentrations of SiO2, Na2O, K2O, Zr, Nb, Y and REE (except Eu) but low in MgO, Fe2O3(t), CaO, Cr, Ni, Sr; indicating their A-type affinity. Field studies in conjunction with the geochemical characteristic indicate that the magmatism in the Siner area is generally represented by peralkaline suite of rocks which are formed due to rift tectonics. It is also suggested that these acidic rocks could have been derived by low degree partial melting of crustal material. Characteristics of certain pathfinder elements such as Rb, Ba, Sr, K, Zr, Nb, REE and the ratios of K/Rb, Zr/Rb, Ba/Rb along with the multi elemental primitive mantle normalized spidergrams suggest that the Siner peralkaline granites and microgranites have the potential for rare metal and rare earth mineralizations.

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Sarjesh Singh, L., Vallinayagam, G. Geochemistry and petrogenesis of acid volcano-plutonic rocks of the Siner area, Siwana Ring Complex, Northwestern Peninsular India. J Geol Soc India 82, 67–79 (2013). https://doi.org/10.1007/s12594-013-0122-7

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