| Among typical gold deposits in Lesser Xing’an Range-Zhangguangcai Range metallogenic belt, Gaosongshan deposit is a large-sized gold deposits which located in southeast of Xunke County, Heilongjiang Province. In this study, we focused on some issues such as petrogenetic ore-hosting volcanic rocks, minerogenic environments, characteristics of ore-forming fluid, source of ore-forming fluid and materials, using some feasible methods such as trace elements testing, fluid inclusion homotemperature measuring, stable isotope measuring. Depending on those works above, we had a discussion on the genesis and ore-forming mechanism of Gaosongshan gold deposit and achieved following results:Surrounded by volcanic rocks of Banzifang Formation and controlled by fault, ore bodies of this gold deposit is hosted in NWW, NEE,EW trends secondary faults of Shaaqihe fault, ores are mainly tectonic breccia type and strong silicificated type. Wall rock alteration is mainly silicification, calcite, adularia, sericitization, mineralization is mainly silicification and pyrite. Ore-forming fluid is characterized by low temperature(168 ℃ ~ 325 ℃) and low salinity(1.05-4.18wt% Na Cleq),thus make this deposit a typical low-sulfur epithermal deposits.Mineralization can be divided into four stage, namely: Stage 1: sericite-pyrite- sphalerite stage; Stage 2: gray quartz-sericite-pyrite- sphalerite stage; Stage 3: white quartz-illite-adularia-pyrite-chalcopyrite stage; Stage 4: calcite-chalcopyrite-galena stage. Mineralization is mainly occour in Stage 2 and Stage 3.H, O and C isotopic characteristics indicates ore-forming fluid is mixed by meteoric recharged underground water and magmatic fluid, which is mainly composed from meteoric recharged underground water. S isotopicand rare-earth elements characteristics indicates the source of ore-forming materials is not single. Ore-forming is occoured in the later phase of the eruption of Banzifang Formation, and is probably related to subduction of the Paleo-Pacific plate. |
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