| The tectonic position of Daduhe Yizhuxiang gold deposit is in the western margin of the Yangtze and Songpan- Garze orogenic belt adjacent to the eastern region, whichl ocated in the north-south axis of Kang Dian tectonic zone in the northernmost of Xianshuihe, intersaction of Longmen Mountains and Panxi rift.Gold deposit occurs in Presinian Kangding diamictite.Through the field geological survey, trace element analysis chamber test of endoscopic research, petrological characteristics, host rock and quartz, pyrite and other minerals in a single or whole rock analysis of major elements test, pyrite chalcopyrite sulphide sulfur isotope composition analysis, temperature analysis of fluid inclusions in quartz, diabase U-Pb dating of zircon, quartz ESR dating methods such as a comprehensive study of the system of deposits on Yizhuxiang gold mineralization deposit with the objective depth understanding, and get the following main conclusions:?1? Yizhuxiang gold pyrite, quartz and mineral REE patterns are consistent, it showed a gentle curve of rightist and having weak positive Eu anomaly,Ce anomaly obvious characteristics.?2? Yizhuxiang quartz inclusions in gold deposit of the homogenization temperature range considerably, mainly distributed in 149.2?-219 ?, belonging to low hydrothermal fluids temperature.?3? Yizhuxiang gold pyrite, ?34S value of chalcopyrite range is small, ?34S value is-0.6 ‰3.7 ‰, more stable composition and high degree of uniformity, with obvious mantle sulfur isotopic composition characteristics.?4? By diabase zircon U-Pb dating methods,dating Yizhuxiang gold deposit of diabase primary crystallization age of214.7±2.4Ma.?5? By quartz thermal activation ESR dating method, age measured the Yizhuaxiang gold deposit in quartz after last zeroing role in the distribution of5.4 ± 0.5Ma, which corresponds to the period after the collision of the Tibetan Plateau?0-25Ma?, showed the Yizhuaxiang gold deposit is after the collision of mainly formed by shearing orogenic gold deposit.?6? In summary, the combination of research methods of element geochemistry, isotope geochemistry, fluid inclusions,etc., on Yizhuxiang gold deposit forming fluids detailed study we found that belongs to metamorphic hydrothermal ore-forming fluids in low hydrothermal fluidstemperature, and it has the characteristics of mantle sulfur. While the main gold mineralization within quartz veins related to the mining area, controlled by quartz veins, Yizhuxiang gold deposit are quartz vein type gold deposit. |
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