Geologic structure of the Mukodek gold field (northern Transbaikalia) and sources of matter (Pb-Pb and Sm-Nd data) |
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| Authors: | VA Vanin AV Chugaev EI Demonterova DP Gladkochub AM Mazukabzov |
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| Institution: | 1. Institute of the Earth’s Crust, Siberina Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia;2. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, Zh-17, 119017, Russia |
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| Abstract: | The Mukodek gold field is located in the Yana zone of the Baikal-Muya fold belt (northern Transbaikalia). Its orebodies are gold-bearing metasomatites confined to the fault of NE strike. It is shown that pre-ore faults played a crucial role in the spatial localization of the orebodies, as they favored the concentration of ore-bearing fluids. Results of geological and structural studies, along with available geochronological data (40Ar-39Ar dates for micas in gold-bearing pyrite), testify to ore-forming processes in the ore field during two Late Paleozoic stages. Early gold-bearing metasomatites of sericite-chlorite-albite-ankerite-quartz composition formed at 320 Ma, and late gold-bearing vein metasomatites of ankerite(calcite)-quartz composition originated at 285 Ma. A Pb-Pb isotope study of gold mineralization has shown that ore lead was supplied into the mineral-forming system mainly from a mantle source, most likely, regional Neoproterozoic igneous rocks. According to Sm-Nd isotope data, these rocks formed with the participation of a material of mantle genesis. |
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| Keywords: | gold mineralization Mukodek gold field gold-bearing metasomatites Sm-Nd and Pb-Pb isotope data northern Transbaikalia Baikal-Muya belt |
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