氧、硫逸度对岫岩红旗铅锌矿床矿物组合共生分异的制约  

Constraints of fO2 and fS2 on the Paragenesis and Separation of Mineral Assemblages in Hongqi Pb-Zn Deposit,Xiuyan

作　　者：温守钦[1] 唐铁乔 谢伟 付建飞[1] WEN Shou-qin;TANG Tie-qiao;XIE Wei;FU Jian-fei(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2020年第7期999-1007,共9页Journal of Northeastern University(Natural Science)

基　　金：国家重点研发计划项目(2016YFC0801603).

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fO2和硫逸度fS2,绘制出Fe-Pb-Zn-Cu-O-S体系热力学lgfO2-lgfS2参数状态图.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.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.

关 键 词：辽吉成矿带 岫岩 红旗铅锌矿 lgfo2-lgfs2图 矿物共生组合 

分 类 号：TP20[自动化与计算机技术—检测技术与自动化装置]