| The Geochemical Characteristics and Minerogenic Model for the Amo Hypothermal Tin Deposit in Ximeng County, Yunnan Province |
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| 摘 要： | Through studies on the element geochemistry, alteration of country rocks, ore-forming fluids and isotopegeochemistry of the Arno tin deposit in the metamorphic rocks of the Upper Proterozoic Ximeng Group, theauthors consider that the concentration of the B-F-Li-Rb-Cs-Sn association is related to acidic magmatism inthe study area. The Fe-Mg-Li tourmaline in the ore is the replaced product of the country rocks byhypothermal fluid. The δ~(18)O values of mineral separates are +2.01- +13.16‰ and their δ~(34)S values, +2.6-+7.2‰. The ore-forming materials were derived from hydrothermal fluid of granitic magma. For themineralization, the temperature is 450°-350℃, the pressure, 450-1000×10~5 Pa, and the age, Himalayan(21.5 Ma). According to the geochemical characteristics, a minerogenic model is established: the deposit is ahypothermal cassiterite-quartz vein type tin deposit controlled by the hidden Himalayan granites.
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The Geochemical Characteristics and Minerogenic Model for the Amo Hypothermal Tin Deposit in Ximeng County,Yunnan Province |
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| Authors: | Zhao Daxian Tang Guangting |
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| Abstract: | Abstract Through studies on the element geochemistry, alteration of country rocks, ore-forming fluids and isotope geochemistry of the Amo tin deposit in the metamorphic rocks of the Upper Proterozoic Ximeng Group, the authors consider that the concentration of the B-F-Li-Rb-Cs-Sn association is related to acidic magmatism in the study area. The Fe- Mg- Li tourmaline in the ore is the replaced product of the country rocks by hypothermal fluid. The δ18O values of mineral separates are +2.01? +13.16%o and their δ34S values, +2.6?+7.2%o. The ore- forming materiais were derived from hydrothermal fluid of granitic magma. For the mineralization, the temperature is 450 ° -350°C, the pressure, 450-1000 × 105 Pa, and the age, Himalayan (21.5 Ma). According to the geochemical characteristics, a minerogenic model is established: the deposit is a hypothermal cassiterite-quartz vein type tin deposit controlled by the hidden Himalayan granites. |
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