Mineralogy, geochemistry, and textural analysis of Galumak perlitic-spherulitic rocks, southwest of Kerman: Evidence of devitrification processes in non-marine environment

Document Type : Original Article

Authors

Shahid Bahonar University of Kerman

Abstract

The Miocene perlitic-spherulitic rocks of Galumak, located in the southern part of Urumieh-Dokhtar magmatic assemblage, are characterized by the presence of phenocrysts such as plagioclase, biotite, clinopyroxene, and amphibole. These rocks exhibit various textures resulting from devitrification processes, which are influenced by temperature variations and the presence of fluids. At the highest temperatures, perlitic textures are formed during rapid hydration and expansion processes. As the temperature decreases, a range of features emerges, including lithophysae, isolated spherulites, and clustered spherulites. Ultimately, the growth of fibrous crystals and the development of banded flow textures are observed at the lowest temperatures. All these textures contribute to the progressive development of cryptocrystalline to microcrystalline textures, accompanied by the gradual elimination of glass. X-ray diffraction (XRD) analysis confirms the presence of minerals such as plagioclase, K-feldspar, cristobalite, and diopside in these rocks. Geochemical studies reveal that these rocks exhibit a rhyolitic composition, classified as subalkaline, and display a metaluminous nature. It is inferred that the studied rocks have similar origin and occurred during the hydration and devitrification processes of pyroclastic flows in a non-marine environment. Notably, the chemical composition of these rocks is comparable to other industrial perlite deposits worldwide.

Keywords

References

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History

  • Receive Date: 26 October 2024
  • Revise Date: 10 December 2024
  • Accept Date: 28 December 2024

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