黄金科学技术 ›› 2022, Vol. 30 ›› Issue (1): 19-33.doi: 10.11872/j.issn.1005-2518.2022.01.051
梁改忠1,2(),杨奎锋1,2,3(
),范宏瑞1,2,3,李兴辉1,2,3
Gaizhong LIANG1,2(),Kuifeng YANG1,2,3(
),Hongrui FAN1,2,3,Xinghui LI1,2,3
摘要:
东昆仑成矿带沟里金矿区阿斯哈金矿床中的黄铁矿主要分为两类:早期自形结晶黄铁矿和晚期胶状黄铁矿。为了厘清阿斯哈金矿胶状黄铁矿成因及其成矿意义,本文对具有特殊意义的胶状黄铁矿开展原位微量元素分析、面扫分析和原位硫同位素分析。结果表明:胶状黄铁矿富As、Au、Pb和Cu,贫Co和Ni,Co/Ni比值大于10,δ34S值范围变化较窄(+6.1‰~+6.8‰)。结合显微结构,认为胶状黄铁矿为岩浆热液成因,与阿斯哈金矿区内隐伏花岗闪长斑岩体可能存在密切成因联系。迅速沉淀于温度骤降条件下的胶状黄铁矿中的As和Au发生了解耦,微米级粒径黄铁矿为控制固溶体金富集的主导因素。
中图分类号:
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