On ore-bearing capacity of Chuya anticlinorium granitoids (Baikal fold mountain area)

Abstract

The article presents the results of a petrochemical recalculation study of ore-bearing capacity of the Chuya anticlinorium granitoids in Baikal fold mountain area (BFMT). It is shown that the early Proterozoic granitoids of Kuanda and Chuya-Kodar complexes composing the anticlinorium core are not sufficiently studied in mineralogical terms and, according to the geological survey data (GSD), are identified as barren formations, while the geological maps of the research area mark the presence of different ore mineral resources, the contiguous zones being Bodaibo province (gold-bearing) and Mama province (muscovite-bearing). Based on the available chemical tests data, petrochemical ore-bearing capacity modules have been defined using the known techniques and original charts by Z.G. Karajeva and B.N. Permyakov. In the chart by Z.G. Karajeva, most of the test samples fall into the field of the modified leukocratonic granitoids being mother rocks for the molybdenum, wolfram and tin deposits of the silicate and polymetallic formations as well as for the mica-bearing and partially, rare metal pegmatites. In the classification by B.N. Permyakov, the favorable combination of the petrochemical modules observed for most of the test samples allows referring them to various types of the granitoid fields with tin-wolfram-molybdenum mineralization. The conclusion is that further study of the granitoids is necessary to evaluate the geological position of the potentially ore-bearing facies and their fraction in the examined complexes.