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- W2187423217 abstract "Occurrence of rhyolite with spheroidal structure is being reported first time in the Neoproterozoic Malani Igneous Suite (MIS) of Northwestern Peninsular India. MIS consists predominantly of felsic volcanic rocks, felsic plutonic rocks and minor amount of mafic rocks. A spheroidal rhyolite that is shaped like a sphere but is not perfectly round, especially an ellipsoid that is generated by concentric shells of different colours with different compositions revolving around one of its axes. The spheroidal rhyolite is exposed in an area of 200 sq.m. radius in the Nakora area. It is pale yellow to light brown colour, fine grained and consists essentially of quartz, alkali feldspar with accessories of altered ferromagnesian (arfvedsonite) and iron oxides (hematite and magnetite). Spheroidal structure is up to 5 m dimension and shows large number (up to 70) of concentric shells in a few cm thickness surrounding a nuclei. Nakora rhyolites display different hues viz. dark brown, light pink and pink but dark brown rhyolite is associated with pink colour spheroidal rhyolite where their contact is sharp. Geological setting and the petromineralogical characters of spheroidal rhyolite suggest that at early magmatic processes, the supersaturated liquid crystallized rapidly into relatively differential density silicate liquid phases and growth of crystals lead the formation of spheroidal structure in the studied rhyolite." @default.
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- W2187423217 date "2010-01-01" @default.
- W2187423217 modified "2023-09-27" @default.
- W2187423217 title "First Report of Spheroidal Rhyolite from Nakora area of Malani Igneous Suite, Northwestern Peninsular India" @default.
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