PETROGRAPHIC CHARACTERISTICS OF THE ANDESITES AND TUFFS OF THE KHOJABARKU–MALYANGUR PALEOVOLCANO
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This article presents a petrographic study of the andesites and their tuffs of the Khojabarku–Malyangur paleovolcano, which is distributed in Southern Uzbekistan. The study analyzes the macroscopic and microscopic characteristics of the rocks, including their mineral composition, structure, texture, porphyritic phenocrysts, and secondary alterations. The petrographic characteristics of andesites, andesibasalts, quartz andesites, andesidacites, and tuffaceous rocks were investigated using a polarizing microscope. The results show that the studied volcanic rocks contain plagioclase, amphibole, quartz, and other minerals, while microlitic, hyalopilitic, intersertal, and pilotaxitic structures are developed in the groundmass. Secondary alterations, including saussuritization, chloritization, epidotization, carbonatization, and sericitization, were identified in individual minerals. The obtained petrographic data provide an important scientific basis for clarifying the characteristics of volcanic processes and the formation conditions of volcanic rocks within the Khojabarku–Malyangur paleovolcano.
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