黄金科学技术 ›› 2020, Vol. 28 ›› Issue (5): 712-726.doi: 10.11872/j.issn.1005-2518.2020.05.105
高华1(),谢玉华1,杨亮1,张哲1,柯新星1,刘晓敏1,罗建镖2,3,刘琦2,3,刘继顺2,3,王智琳2,3,孔华2,3()
Hua GAO1(),Yuhua XIE1,Liang YANG1,Zhe ZHANG1,Xinxing KE1,Xiaomin LIU1,Jianbiao LUO2,3,Qi LIU2,3,Jishun LIU2,3,Zhilin WANG2,3,Hua KONG2,3()
摘要:
通道地区位于雪峰弧形带西南段,区内金矿化较普遍,产出有茶溪、黄垢和金坑等中小型金矿床,但该区研究程度很低。为探讨矿床成因,对金矿床中不同产状的黄铁矿进行了成因矿物学研究。岩矿鉴定结果显示:3个金矿床黄铁矿晶形主要为立方体、五角十二面体和他形—半自形粒状;MLA面扫描结果显示,黄垢矿区金主要以裂隙金或包体金赋存在黄铁矿中。EPMA常量元素分析结果显示:黄铁矿总体上富铁亏硫,含少量砷。3个矿区黄铁矿的δFe、δS值分布集中,与变质热液型金矿床的特征一致。LA-ICPMS微量元素分析结果显示:金坑矿区黄铁矿的Co/Ni比值投点多数小于1,反映流体以变质热液为主;黄垢矿区的黄铁矿大致可划分为两类,其中产于细脉中的黄铁矿Co/Ni比值接近于0,为热液成因。As-Co-Ni图解显示金坑和黄垢矿区的黄铁矿主要成因类型为变质热液型,成矿温度应为中—低温。比较而言,金坑矿区黄铁矿中成矿指示元素(如Au、Ag、Cu、Pb、Zn等)含量较高且稳定,暗示金坑矿区比黄垢矿区更有利于形成中—大规模的金矿。总体上通道地区金矿剥蚀较浅,深部仍有很大的找矿前景。
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