PETROGRAPHIC CHARACTERISTICS OF MAGMATIC ROCKS OF THE YERTOSHSOY AREA (CHATKAL MOUNTAINS)
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Abstract
The article investigates the petrographic and petrochemical characteristics of igneous rocks distributed in the Yertoshsoy area and the patterns of their formation. The study was conducted based on field geological observations, mineralogical and petrographic analysis of thin and polished sections, and a comparative assessment of the chemical composition of the rocks. The results revealed the occurrence of igneous rocks of different compositions, including dolerite, adamellite, leucogranite, and trachyrhyolite. Their mineral composition, structural and textural characteristics, and secondary alteration features were described. Petrochemical data indicate a magmatic differentiation process characterized by an increase in SiO₂, K₂O, and Na₂O contents and a simultaneous decrease in MgO, CaO, and iron components during magmatic evolution. The occurrence of basic dolerite dikes cutting granitoid rocks indicates that magmatic processes in the Yertoshsoy area developed through several stages. The results provide a scientific basis for clarifying the geological evolution of the area, understanding magmatic differentiation, and assessing geological factors associated with the prospectivity of mineralization.
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