东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (7): 999-1007.DOI: 10.12068/j.issn.1005-3026.2020.07.014

• 资源与土木工程 • 上一篇    下一篇

氧、硫逸度对岫岩红旗铅锌矿床矿物组合共生分异的制约

温守钦, 唐铁乔, 谢伟, 付建飞   

  1. (东北大学 资源与土木工程学院, 辽宁 沈阳110819)
  • 收稿日期:2019-11-08 修回日期:2019-11-08 出版日期:2020-07-15 发布日期:2020-07-15
  • 通讯作者: 温守钦
  • 作者简介:温守钦(1963-),男,广西玉林人,东北大学副教授.
  • 基金资助:
    国家重点研发计划项目(2016YFC0801603).

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
  • About author:-
  • Supported by:
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摘要: 基于野外调查和镜下鉴定,通过计算岫岩红旗铅锌矿床主要矿物在不同温度T下的氧逸度fO▲2和硫逸度fS▲2,绘制出Fe-Pb-Zn-Cu-O-S体系热力学lgfO▲2-lgfS▲2参数状态图.研究该区矿物共生组合的控制因素及其形成的物理化学条件,为解决辽吉成矿带同类型矿床成矿流体演化提供参考.结果表明,T,fo2,fs2是使成矿元素沉淀、金属矿物组合共生分异的重要因素.fo2,fs2控制着矿物的稳定区间,闪锌矿较大的稳定范围,使它在方铅矿、黄铁矿沉淀之后仍可运移沉淀;温度降低使矿物形成所需的最低lgfo2,lgfs2减小,因此降温更利于成矿;构造破碎带为流体提供了运移通道,同时也是良好的地球化学障.在实际找矿过程中,断裂构造、铁帽、中低温蚀变发育的地方值得重视.

关键词: 辽吉成矿带, 岫岩, 红旗铅锌矿, lgfo2-lgfs2图, 矿物共生组合

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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