Geochemistry of the Neoproterozoic Volcanic Rocks of the Nakora Area of Malani Igneous Suite, Barmer District, Western Rajasthan, India

The Neoproterozoic rocks of the Nakora Ring Complex (NRC) consist three phases (Extrusive, Intrusive and Dyke) that are based on detailed geological mapping (contact relationship, mode occurrence, position xenolith, flows, dykes veins) their stratigraphic position. NRC consists mainly acid volcanic besides minor amount basic with intermediate calc-alkaline to tholeiitic affinities occurs in form ring structures. basaltic show LREE enriched nature they have consistent negative Nb, Ta, Sr Zr anomalies. HREE pattern is showing parallel arrangement other rocks. exhibit high enrichment than Ba, Sr, Eu Ti anomalies primitive mantle normalized multi-element diagrams. All samples diminution amounts apparently related fractionation feldspars or retention refractory minerals resistant melting lower crust. As compared trachytes, rhyolites SiO2, Al2O3, low total alkalis, iron, TiO2, CaO MgO. petro-mineralogical geo-chemical data specifies generated from a co-magmatic source through co-genetic process rift tectonic context. Petrogenetic modeling indicates both may been derived akin Bhilwara mafic metavolcanic/mixed gabbros Siwana rhyolite/banded gneiss Kolar Schist Belt by different degrees partial respectively.