| 吴金虹,章志明,陈澍民,潘思远,曾昊,肖涛,彭勃.湖南天明金矿床 Cu-Zn合金矿物的发现及地质意义[J].矿产勘查,2024,15(12):2226-2233 |
| 湖南天明金矿床 Cu-Zn合金矿物的发现及地质意义 |
| Discovery and significance of Cu-Zn intermetallic compounds in the Tian-ming gold deposit, Hunan Province |
| 投稿时间：2023-01-13 |
| DOI：10.20008/j.kckc.202412006 |
| 中文关键词: 雪峰造山带 天明金矿床 铜锌合金矿物 含砷黝铜矿 地质意义 |
| 英文关键词: Xuefeng tectonic belt Tianming gold deposit Cu-Zn intermetallic compounds sulfur intermetallic compounds geology significance |
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| 中文摘要: |
| 湖南安化县天明金矿床是雪峰成矿带上新探明的一个中低温热液型金矿床。本文勘查发现该矿床的矿化类型为石英-黄铁矿脉型，金主要赋存在黄铁矿中。为研究天明金矿床物质组分特征，通过对石英黄铁矿矿脉中金属硫化物开展显微镜观察和电子探针分析，发现了天明金矿 α+β-Cu-Zn合金化学分子式为 Cu0.60Zn0.37Pb0.01Fe0.01，Cu的质量分数为 57.12%~58.73%，Zn的质量分数为 36.60%~37.84%；黄铁矿化学分子式为 Fe1.03S2，Fe的质量分数为 46.29%~46.65%，硫亏损 (S/Fe＜2)；含砷黝铜矿化学分子式为 Cu0.77Sb0.18Zn0.13As0.12Fe0.02S，Cu的质量分数为 38.592%~39.599%，Sb为 17.620%~18.445%。结合天明金矿床成矿特征和区域成矿条件，笔者认为天明金矿床 Cu-Zn合金的形成为岩浆快速上升，在局部缺氧的还原环境下，压力突然下降，较短的时间导致硫与金属元素间难以结合，而自然沉淀形成。天明金矿床 α+β -Cu-Zn合金矿物在雪峰成矿带的首次发现，对在该成矿带寻找相同石英-黄铁矿脉型金矿床具有重要的指示意义。 |
| 英文摘要: |
| The Tianming gold deposit in Anhua County, Hunan Province is a newly discovered medium to lowtemperature hydrothermal gold deposit on the Xuefeng orogenic belt, whose the mineralization type is quartz pyritevein type, with gold mainly occurring in pyrite. To study the material composition characteristics of the Tianminggold deposit, microscopic observation and electron probe analysis of metal sulfides in quartz pyrite veins were car.ried out. We found that the chemical molecular formula of α+β-Cu-Zn alloy is Cu0.60Zn0.37Pb0.01Fe0.01, with a massfraction of 57.12% to 58.73% for Cu and 36.60% to 37.84% for Zn; The chemical formula of pyrite is Fe1.03S2, with amass fraction of Fe ranging from 46.29% to 46.65%, resulting in sulfur deficiency (S/Fe<2); The chemical formulaof arsenic containing tetrahedrite is Cu0.77Sb0.18Zn0.13As0.12Fe0.02S, with a mass fraction of 38.592%-39.599% for Cuand 17.620%-18.445% for Sb. Based on the ore-forming characteristics and regional ore-forming conditions of theTianming gold deposit, we suggest that the rapid magma upwelling, the sudden drop in pressure, and the rapid sepa.ration of fluids in a topo-reducing environment, difficult to combine sulfur and metal elements in a relatively shortperiod of time, thus deposit to form. The discovery of Cu Zn alloy minerals in the Tianming gold deposit in the Xue.feng mineralization zone is the first time, which has important indicative significance for searching for similar quartzpyrite vein type gold deposits in this mineralization zone. |
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