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- W2768737356 abstract "The newly discovered Daxintun Sb-Au deposit (Heilongjiang province, NE China) is located at the north-eastern margin of the Central Asian Orogenic Belt, and it is hosted by Neoproterozoic to Early-Cambrian two-mica schist and marble. The antimony-bearing minerals include stibnite, famatinite, tetrahedrite, boulangerite, freibergite, and minor andorite. Gold occurs largely as native gold microparticles (0.1–20 μm) with high fineness (974–983) accompanied by quartz, stibnite, calcite and pyrite. Fluid inclusions in ore-bearing quartz and calcite phases mainly comprise liquid–vapor and minor CO2-bearing three-phase types, and the gas phases contain CO2, CH4 and H2S. The Daxintun fluid inclusions homogenize at 111.8–353.4 °C and are of low salinity (0.53–12.51 wt% NaCl equiv.). The δ18OSMOW of the Daxintun quartz falls into a wide range (4.2‰–16.9‰), yet the δDSMOW falls into a narrow range (−108.0‰ to −87.3‰), suggesting that the ore-forming fluids formed from metamorphic fluids that mixed with meteoric water. The stibnite δ34S ranges between −0.9‰ and 5.1‰ (mean = 2.8‰). The stibnite has 206Pb/204Pb of 18.234–18.306, 207Pb/204Pb of 15.537–15.561 and 208Pb/204Pb of 38.103–38.227, implying a metamorphic fluid source. The conditions of gold and antimony precipitation are comprised of neutral pH and fluid mixing, with decreasing fS2 and fO2. Zircon U-Pb dating of the fine-grained Daxintun granite yields a Late-Jurassic age (154.0 ± 2.0 Ma), and the Daxintun diorite dike yields a weighted mean age of 122.1 ± 1.3 Ma. Stibnite Rb-Sr dating suggests that the Sb-Au mineralization has an age of approximately 152.8 ± 2.4 Ma. The observed ore deposit geology, as well as new data on the ore-forming fluids, H-O-S-Pb isotopes, and Rb-Sr geochronology, suggest that the Daxintun Sb-Au deposit is best described as an orogenic type gold deposit that formed during subduction of the Palaeo-Pacific and the Mongolia–Okhotsk Oceans during the Late-Jurassic." @default.
- W2768737356 created "2017-12-04" @default.
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- W2768737356 date "2018-01-01" @default.
- W2768737356 modified "2023-10-03" @default.
- W2768737356 title "Geology, hydrothermal fluids, H-O-S-Pb isotopes, and Rb-Sr geochronology of the Daxintun orogenic gold deposit in Heilongjiang province, NE China" @default.
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- W2768737356 doi "https://doi.org/10.1016/j.oregeorev.2017.11.014" @default.
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