黄金科学技术 ›› 2023, Vol. 31 ›› Issue (2): 175-189.doi: 10.11872/j.issn.1005-2518.2023.02.121
Zhilin WANG1(),Kai ZHANG1,Deru XU2,Shaohao ZOU2,Yufei WANG1
摘要:
东昆仑是我国西部重要的金、铜、铁、钴、镍多金属成矿带,其中,驼路沟钴(金)矿床是西北地区发现的首例大型独立钴矿床,目前关于该矿床中钴的成矿过程尚存在争议。在详细野外地质调查和岩(矿)相学观察的基础上,结合EPMA和EBSD分析,将驼路沟钴成矿过程划分为喷流沉积期和叠加改造期,喷流沉积期形成了细粒富钴黄铁矿(PyⅠ),叠加改造期包括细粒富钴黄铁矿(PyⅡ)+辉砷钴矿—辉砷镍矿+硫镍钴矿+磁黄铁矿+少量黄铜矿阶段和半自形—他形粗粒贫钴黄铁矿(PyⅢ)+自然金阶段。其中,PyⅠ中钴含量为0.03%~4.86%,PyⅡ中钴含量为0.38%~2.74%,PyⅢ中钴含量为0.03%~0.58%,流体耦合的溶解再沉淀机制是黄铁矿复杂环带的重要形成机制。上述矿物学研究表明:钴在驼路沟矿床中以独立矿物和富钴黄铁矿2种形式赋存,喷流沉积成矿作用和后期构造变形叠加改造作用是驼路沟矿床中钴富集成矿的2个重要过程。
中图分类号:
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