| Annotation |
The research objects were ore and magmatic systems of Sherlovogorsky and Khapcheranginsky tin-polymetallic deposits. A petrogeochemical composition of rocks and ores from these deposits was established. The research subject was petrogeochemical rocks features of ore-magmatic systems components. The objectives of the study are the understanding of ore-magmatic systems’ formation mechanisms of the tin-polymetallic deposits.
Actual material was collected by the author during the case studies in the Institute of Natural Resources, Ecology and Cryology of SB RAS (Chita) in 2008–2015. Elemental rock composition determination of the study objects was carried out by X-ray fluorescent (XRF) and ISP-AES methods at the Geological Institute of GIN SO RAS (Ulan-Ude). Methodological basis of the study has become the investigation of petrochemical composition of rocks, distribution regularities of rare and rare-earth elements in them, which allowed to establish features of formation of explored tin-polymetallic deposits. It was found out that geochemical features of the composition of acidic intrusive formations of Khapcheranginsky deposit indicate their correspondence to the island-arc formations, Sherlovogorsky deposit, mainly intraplate formations.
The correspondence of granites of Sherlovogorsky, Khapcheranginsky deposits, quartz porphyries of Khapcheranginsky deposit of ilmenite series to magmatites of I-type, quartz porphyries of Sherlovogorsky deposit, basically to granitoids of magnetite series of S-type has been revealed. It was found that the magma chambers of Sherlovogorsky ore-magmatic system were located at depths corresponding to the upper continental crust. The formation of magma chambers of leucocratic granites and quartz porphyries of the Khapcheranginsky OMS has occurred at a depth corresponding to the upper continental crust, diorite porphyries – the lower continental crust. The analysis of petrogeochemical values of the intrusive formations of Sherlovogorsky and Khapcherginsky deposits indicates that their average fractionation depths, quartz porphyries and sulfide-cassiterite ores of Sherlovogorsky deposit correspond to shallow fractionation depths. According to Eu/Eu* ratios in ore-magmatic systems of Sherlovogorsky and Khapcheranginsky deposits, the most differentiated were magmatic melts of leucocratic granites of Kukulbeysky J3 and Kyrinsky J1-2 complexes. The ore-bearing magmatic hearths of Khapcheranginsky deposit were functioning at depths corresponding to the lower continental crust (Eu/Sm – 0.23…0.32), Sherlovogorsky deposit – to the upper continental crust (Eu/Sm – 0.07…0.11) |
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