闽北大药坑金矿床黄铁矿成分标型及硫、铅同位素组成研究

发布时间：2019-04-19 22:34

【摘要】：闽北政和-建瓯矿集区内大药坑金矿床是一个赋存于韧性剪切带中的小型矿床。在野外地质调查基础上,通过分析载金矿物黄铁矿电子探针成分和硫化物硫、铅同位素组成,探讨了大药坑金矿床的成矿作用问题。研究表明,大药坑金矿床黄铁矿的Co/Ni比值大多在1~5之间,为岩浆热液成因黄铁矿,成矿热液的温度和盐度均较高,也表现出岩浆热液的性质;金属硫化物的δ~(34) SCDT均为靠近0的较低正值(0.1‰~3.4‰),说明成矿物质为岩浆来源,硫化物的铅同位素比值以及高μ(~(238)U/~(204)Pb)和ω(~(232)Th/~(204)Pb)等特征,说明成矿物质具有壳幔混源特征。结合区域研究资料,认为大药坑金矿床形成于东南沿海区域强烈壳幔作用时期,与燕山期火山-侵入杂岩有关,矿床成因类型为岩浆期后热液型。
[Abstract]:The Daoyokeng gold deposit in the Zhenghe-Jianou ore concentration area in northern Fujian is a small-scale deposit occurring in ductile shear zone. On the basis of field geological investigation, the metallogeny of Daoyokeng gold deposit is discussed by analyzing the composition of electron probe and sulfur and lead isotopic composition of pyrite, a gold-carrying mineral, as well as the composition of sulfur and lead isotopes of sulphide. The results show that the Co/Ni ratio of pyrite in Dayukeng gold deposit is mostly between 1 and 5, which is magmatic hydrothermal pyrite. The temperature and salinity of ore-forming hydrothermal fluid are relatively high, which also show the property of magmatic hydrothermal fluid. The 未 ~ (34) SCDT of metallic sulphides are all lower positive values (0.1 鈥，

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