Баргилтын төмрийн ордын бодисын найрлагын судлагаа ба хүдэржилтийн онцлог

Abstract

The Bargilt deposit is located in central part of continental terranes of the Idermeg mainland of the Central Mongolian superterrain in the tectonic block in the southeastern part of the Bor-Undur fault. This paper reports the examination of petrology of host rocks, ore minerals, and their chemical compositions. There are determined rocks of 4 types which are strongly mineralized pyroxenite, bulkly mineralized and serpentinized dunite, serpentized ore with magnetite, and medium to large grained biotite granite. Magnetite ore has layer that includes olivine, monocline pyroxen, hornblende, serpentine, carbonate, quartz, plagioclase, potassium feldspar, biotite, molybdenite, sphalerite, pyrite, chalcopyrite, galenite, cubanite and iddingsite. The primary source of this ore is the ultrabasic rocks (dunite and pyroxenite) that have been strongly altered by magnetization and serpentinitization. Because of this, it is likely that the magnetite was formed a little earlier than the serpentine, or at the same stage of transformation. In other word, magnetite is formed by oxidation of primary ultrabasic rocks which are olivine and pyroxene.