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Nature And Crystallization Stages Of Spherulites Within The Obsidian: Acıgöl (Cappadocia- Nevşehir, Turkey), Bahatti̇n Güllü, Kiymet Deni̇z

Turkish Journal of Earth Sciences

The study area comprises a part of the Central Anatolian Cenozoic volcanism within the Cappadocia Volcanic Province (CVP). Obsidian, perlite rhyolite flows, and volcanic ashes are observed in the study area and the spherulites within the obsidian are the objects of this study. The spherulites occupied within the obsidian in the form of round nodules 0.5-10 cm in diameter. The confocal Raman spectra of feldspar minerals within the spherulites are characterized by T-O-T and M-O lattice modes in the range of 100-250 cm^-1, O-T-O deformation and T-O-T lattice modes in the range of 250-350 cm^-1, and …