Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (7): 999-1007.DOI: 10.12068/j.issn.1005-3026.2020.07.014

• Resources & Civil Engineering • Previous Articles     Next Articles

Constraints of fO▲2 and fS▲2 on the Paragenesis and Separation of Mineral Assemblages in Hongqi Pb-Zn Deposit, Xiuyan

WEN Shou-qin, TANG Tie-qiao, XIE Wei, FU Jian-fei   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2019-11-08 Revised:2019-11-08 Online:2020-07-15 Published:2020-07-15
  • Contact: TANG Tie-qiao
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Abstract: Based on field investigation and microscopic mineral identification results, the thermodynamic lgfo2-lgfs2 parameter state diagrams of Fe-Pb-Zn-Cu-O-S system were plotted by calculating the oxygen-sulfur fugacity of main minerals in Hongqi Pb-Zn deposit, Xiuyan, at different temperatures. The controlling factors and physicochemical conditions of minerals paragenesis were studied to provide a reference for solving the ore-forming fluid evolution of the same type of deposits in the Liaoji metallogenic belt. The results indicated that T, fo2, fs2 are key factors for the precipitation of ore-forming elements and the paragenesis of mineral assemblage. The large stable range of sphalerite is controlled by fo2, fs2, making Zn+ still transportable after galena and pyrite precipitation. Cooling is conducive to mineralization because the minimum lgfo2, lgfs2 formed by minerals decrease when the temperature is lowered. The tectonic fracture zone provides a migration channel for fluid, and it is also a good geochemical barrier. In prospecting process, it is important to pay special attention to the places with fault structure, gossan and medium-low temperature alterations.

Key words: Liaoji metallogenic belt, Xiuyan, Hongqi Pb-Zn deposit, lgfo2-lgfs2 diagram, mineral assemblage

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