江西永平铜多金属矿床岩相学、矿相学特征及其意义

永平矿床位于江西省铅山县境内，为江西省规模第二大的富铜多金属矿床。在永平铜矿火烧岗采场进行野外地质调查、样品采集、室内岩相学与矿相学和电镜能谱研究的基础上，确定矿区内主要的容矿围岩为互层状安山-玄武岩和钙铁榴石矽卡岩，其中，夹有灰质硅质岩和片岩，以及层状与透镜状矿体，为典型的海底火山喷发环境。大量胶状黄铁矿的存在表明曾经发生过大规模的热水沉积作用；胶状黄铁矿普遍重结晶和钙铁榴石矽卡岩本身就代表着变质作用（或矽卡岩化作用），在成矿过程中发挥了重要作用；后期强烈的热液蚀变对成矿物质进一步富集成矿起到促进作用。有用元素除铜与钨外，铋与铟的含量也达到最低工业品位的要求，新发现含铼白钨矿、含稀土沥青铀矿与一系列金属铋和碲的矿物：自然铋、辉铋矿、硫铜铋矿、含银辉铜铋矿、硫银铋矿、沃仑斯基矿、碲铋矿、叶碲铋矿、铁铜碲硫铋矿、含锝碲银矿、辉铋碲银矿(?)、叶碲铋-碲银矿(?)等。

Petrographic and Mineragraphic Characteristics of Yongping Copper Polymetallic Ore Deposit in Jiangxi Province and Their Significance

Yongping deposit is located in the Qianshan County, and is the second largest copper-rich polymetallic deposit in Jiangxi Province. Based on the detailed field work in Huoshaogang open-pit, samples collecting, petrographic and mineragraphic determination, SEM and EDS analysis, it can be considered that the ore-hosting strata are composed of interlayered andesitic basalt and andradite skarn, with siliceous rock and schist, layered and lentoid ore body, which indicates the typical oceanic bottom volcanic effusive sedimentary environment. A large number of colloidal pyrite means that there had been large-scale hot water sedimentary. Metamorphism(or skarnization) represented by recrystallization colloidal pyrite and andradite skarn played an important role in the mineralization process. The hydrothermal alteration caused the more concentration of ore forming materials. Besides copper and tungsten, we think, bismuth and indium were concentrate to the lowest level for exploration. We also have found Re-bearing scheelite, Ree-uraninite and a series of tellurium and bismuth minerals, such as native bismuth, bismuthinite, emplectite, Ag-cuprobismutite, argentobismutite, Warren Sharansky ore, tellurobismuthite, pilsenite, iron-copper-tellurium-sulfur-bismuth, Tc-hessite, bismuth-telluride-silver(?) as well as pilsenite-hessite(?).