| The Inner Mongolia Linxi Bianjiadayuan Pb-Zn-Ag polymetallogenic deposits are new found recently. They consist of three deposits including western porphyry-hosted W-Sn-Mo deposit, central breccia-hosted Cu-Pb-Zn deposit, and eastern vein type Pb-Zn-Ag deposit. The article describes that 29 sphalerites from deposits are conducted Zn isotope analysis, and combines Bianjiadayuan polymetallogenic deposit geology?physical property, which obtaines the following understanding:(1) The paper concludes that the geological feature of Bianjiadayuan Pb-Zn-Ag polymetallogenic deposits. Fluid inclusions?major and trace element?H-O?C-O isotope of Bianjiadayuan Pb-Zn-Ag polymetallogenic deposits help study the source of ore-forming.(2) According to study of 29 sphalerites of the Bianjiadayuan Pb-Zn-Ag polymetallogenic deposits, Zn isotope values from samples show an increasing trend from western to eastern deposit(+0.17‰ to+0.36‰). Nevertheless,lower Zn values are observed in the breccia deposit. Systematic increasing suggestes that three small deposits come from the same ore-forming system, and have the temporal and spatial connections. Lighter zinc isotope samples, which may be explained that weather leaching changes Zn isotope values after mineralization.(3) Using the analysis on Zn isotope of Bianjiadayuan deposits, we reveal directly that three small deposits come from the same system and exist connection.That lays the foundation for the next work of forecasting and finding ore. |
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