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Volume 31 Issue 2
Apr 2020
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He Yang, Wanli Ma, Rui Wang, Xueli Ma, Keyong Wang. Factors Controlling Deposition of Metallic Minerals in the Meng'entaolegai Ag-Pb-Zn Deposit, Inner Mongolia, China: Evidence from Fluid Inclusions, Isotope Systematics, and Thermodynamic Model. Journal of Earth Science, 2020, 31(2): 271-286. doi: 10.1007/s12583-019-1273-2
Citation: He Yang, Wanli Ma, Rui Wang, Xueli Ma, Keyong Wang. Factors Controlling Deposition of Metallic Minerals in the Meng'entaolegai Ag-Pb-Zn Deposit, Inner Mongolia, China: Evidence from Fluid Inclusions, Isotope Systematics, and Thermodynamic Model. Journal of Earth Science, 2020, 31(2): 271-286. doi: 10.1007/s12583-019-1273-2

Factors Controlling Deposition of Metallic Minerals in the Meng'entaolegai Ag-Pb-Zn Deposit, Inner Mongolia, China: Evidence from Fluid Inclusions, Isotope Systematics, and Thermodynamic Model

doi: 10.1007/s12583-019-1273-2
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  • Corresponding author: Keyong Wang, wangky@jlu.edu.cn
  • Received Date: 29 Nov 2018
  • Accepted Date: 30 Sep 2019
  • Publish Date: 01 Feb 2020
  • The Meng'entaolegai Ag-Pb-Zn vein-type deposit in Inner Mongolia,NE China is hosted in biotite/muscovite granite. This deposit includes the western (Zn-rich,deepest),middle (Zn-Pb rich) and eastern (Pb-Ag-rich,shallowest) ore-blocks. To better understand the metallogenic processes in ore district,we have undertaken a series of studies including fluid inclusion microthermometry,H-O-S-Pb isotope compositions and thermodynamic modeling. Based on fluid inclusion petrography,microthermometry results and H-O isotope compositions,the ore-forming H2O-NaCl fluid inclusions are characterized by medium temperature and medium salinity. And two kinds of fluid processes (boiling in western and middle ore-block and fluid mixing in the eastern ore-block) were identified to explain the ore fluid evolution. More importantly,log fO2-pH diagrams of δ34S contours with the stability fields of Fe-and Cu-,Zn-,Pb-,and Ag-bearing minerals were constructed to restore the physicochemical conditions of ore-forming fluid in the western (270℃ and 80 bars),middle (250℃ and 70 bars),and eastern (230℃ and 50 bars) ore-blocks. As a result,the ore-forming conditions in the western and middle ore-block were similar. In the eastern ore-block,the fluids may have changed from acidic,S-poor and δ34S(ΣS)≈2.8 to neutral,S-richer and δ34S(ΣS)≈0.5,which imply that neutral S-rich meteoric water was mixed with the magmatic fluid. Meanwhile,the activity of Ag+ was estimated to be about 10 ppm-9 ppm in the middle ore-block,but in the eastern ore-block it was about ~10 ppm-12 ppm. We proposed that the key for Ag ore deposition was likely to be neutralization led by fluid mixing.

     

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