Geologicheskii Vestnik

Detailed mineralogical studies of metasomatized rocks from the Kamatal granite massif have been carried out. The primary rocks of the massif were granite-porphyries with phenocrysts of quartz, plagioclase, and biotite. The chemical composition of minerals has been studied for the first time, and the features of postmagmatic mineral associations have been characterized. It was determined that among primary minerals, only quartz (in phenocrysts and in the groundmass) and possibly a small amount of potassium feldspar have been preserved. Among secondary minerals albite, muscovite, rutile, and clay minerals are widespread. The Mn-Ba-Pb chlorite-like aky minerals were found, conferned to cracks. In a sample from the southern part of the massif, epigenetic sul de (pyrite), poorly preserved and hydrosulfate (jarosite – natrojarosite) mineralization as isometric grains and veins was revealed. This is associated with the activity of hydrothermal fluids that participated in the formation of the Severo-Pervomayskoe porphyry copper ore occurrence. The source of ore matter for this ore occurrence could hardly have been the rocks of the Kamatal massif. In terms of mineral and chemical composition, the Kamatal massif can be compared with the Shartym granite massif and preliminary attributed to the Balbuk complex.

Kamatal massif, Balbuk complex, granite, hydrothermal metasomatism, muscovite, jarosite – natrojarosite

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