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The data on the geological position, the features of the mineral and material granitoids composition of the Borschovochny massif, which is localized in the northeastern part of the Eastern Transbaikalia, are given. According to geotectonic zoning, granitoids of the massif are collision formations that arose as a result of the collision of the Siberian craton and the Argun microcontinent in the Late Jurassic time. The granites of the Borschovochny massif correspond to rocks of normal alkalinity with potassium (and ...