湖南水口山典型矿床稀散元素分布特征及其找矿意义

文章以水口山矿田内的3个典型铅锌多金属矿床——康家湾铅锌金银矿床、老鸦巢铅锌金矿床和鸭公塘铅锌铁铜矿床的矿石为研究对象,通过野外地质调查、室内显微鉴定、电子探针分析和LA-ICPMS微量元素分析测试,研究了本区稀散元素的赋存状态、分布规律以及与主成矿元素(Pb、Zn、S、Fe)的关系等,总结出稀散元素在本区的富集规律.研究表明:本区矿石中闪锌矿、黄铁矿、黄铜矿、方铅矿主要富集Cd、In、Te3种稀散元素.康家湾铅锌金银矿床In/Zn比值为0.86,老鸦巢铅锌金矿床In/Zn比值为5.10,而鸭公塘铅锌铁铜矿床In/Zn比值为611.20,且w(In)为33.83×10-6～365.62×10-6,因此,康家湾铅锌金银矿床和老鸦巢铅锌金矿床矿石中的In是以类质同象赋存于闪锌矿和黄铜矿的晶格中,而鸭公塘铅锌铁铜矿床矿石中的In可能以硫铟铜矿的形式赋存.水口山矿田的Te主要有2种赋存形式:一种以类质同象形式赋存于硫化物(黄铁矿)中;另一种以矿石中形成其独立矿物辉碲铋矿(分子式为Bi2TeS2)和碲银矿(分子式为Ag2Te)存在.

The distribution characteristics and its significance for prospecting of rare and rare scattered elements resources: A case study on 3 representative Pb-Zn polymetal deposits in Shuikoushan orefield, Hunan Province

This study focuses on the Kangjiawan, Laoyachao, and Yagongtang Pb-Zn polymetal deposits in the Shuikoushan Orefield with the aim to investigate occurrences and distribution of scattered elements in the ores, reveal its relationship with the major ore-forming elements Pb, Zn, S and Fe, and summarize the enrichment regulations of scattered elements in the ores from the Shuikoushan. The data used for this study came from field investigation, microscope-observation, and in-situ analysis (EPMA and LA-ICP-MS). The results indicate that Cd, In and Te are mainly enriched in sulfide minerals including sphalerite, pyrite, chalcopyrite and galena. The ores from Kangjiawang Pb-Zn-Au-Ag deposit have average In/Zn ratios of 0.86, ores from Laoyacao Pb-Zn-Au deposit have average In/Zn ratios of 5.10, but the ores from Yagongtang Pb-Zn-Fe-Cu deposit have average In/Zn ratios of 611.20 and average In content of 33.83×10^-6~365.62×10^-6. Therefore, it is concluded that In in the ores of Kangjiawan and Laoyachao deposits occurs in the lattice of sphalerite and chalcopyrite as isomorphism, while In in the ores of Yagongtang deposit may mostly occur in independent mineral of roquesite. Moreover, Te in ores from the Shuikoushan orefield occurs as not only isomorphism in sulfide (pyrite), but also independent minerals in tetradymite (Bi₂TeS₂) and Hessite (Ag₂Te).