Mineralogy of the deposit of albitized granites Kanarata, Sakar Мountain, Southеastern Bulgaria

Abstract

The Kanarata albitized granite deposit is located on the NE periphery of the Sakar Upper Carboniferous granite batholith, immediately adjacent to its contact with the metamorphic framework. The porphyroid two-mica granites of the batholith are replaced by albite and quartz, and by magnesium-rich minerals in small amounts (some enriched in sodium): Mg-actinolite to Mg-hornblende and Mg-tremolite, phlogopite, chlorite, talc, saponite, as well as accessory rutile, probably titanite and apatite. The only relict mineral is zircon. The newly formed minerals are products of alkaline (magnesium-sodium) metasomatosis of possibly Alpine age. This has led to a change in the chemical composition of the granite, resulting in a decrease in the amount of silicon, iron, calcium, and especially potassium, and an increase in the amount of titanium, aluminum, magnesium, and especially sodium.