矿床地质2024，Vol.43Issue(4)：735-748,14.DOI:10.16111/j.0258-7106.2024.04.002
郑明华矿(Zhengminghuaite):黔西南卡林型金矿床中新矿物的发现及其成矿学意义
Zhengminghuaite:A new mineral from Carlin-type gold deposits in southwest-ern Guizhou and its metallogenic significance
摘要
Abstract
Zhengminghuaite is a new sulfosalt mineral recently found in the Zimudang Carlin-type gold deposit in southwestern Guizhou. Based on an overview of occurrence,physical and optical properties,chemical composition and crystal structure of the new mineral,the major purpose of this contribution is to document the geological background,microtextures,and relations to other mineral species of isotypic series,and combined with paragenetic sequence,to discuss the formation condition of the new mineral. Zhengminghuaite occurs in fault-controlled brec-ciated gold ores and is paragenetically associated with the late ore-stage quartz,realgar,calcite,and minor to trace amounts of As-Sb-Hg-Tl sulfides and sulfosalts. Zhengminghuaite is opaque and brittle with a metallic luster. It shows no cleavage and has a Mohs hardness of～4. In reflected light,zhengminghuaite is whitish gray,with no to weak bireflectance and reflection pleochroism,very weak anisotropy,and a reflectance of 23％～29％ (546 nm).Zhengminghuaite is trigonal,with space group R3 and unit-cell parameters of a=13.5373(17) Å,c=9.2354(13) Å,and V=1465.7(4) Å3 (Z=3). It belongs to a new member of the nowackiite isotypic series with an ideal formula of Cu6Fe3As4S12. Paragenetic relationships indicate that zhengminghuaite precipitated after the deposition of aurifer-ous arsenian pyrite and arsenopyrite,but was prior to the bulk deposition of realgar,during which the sulfur fugac-ity (f(S2)) of the ore fluid increased by 1～2 log units and the temperature decreased by 60～100℃.关键词
郑明华矿/硫盐/新矿物/卡林型金矿床/成矿意义/黔西南Key words
zhengminghuaite/sulfosalt/new mineral/Carlin-type gold deposit/metallogenic significance/southwestern Guizhou分类
天文与地球科学引用本文复制引用
顾雪祥,章永梅,范光,李婷,董树义,彭义伟,杨成富,李羚..郑明华矿(Zhengminghuaite):黔西南卡林型金矿床中新矿物的发现及其成矿学意义[J].矿床地质,2024,43(4):735-748,14.基金项目
本文得到国家自然科学基金重点项目《沉积盆地中金属成矿与油气成藏关系研究——以右江、兰坪盆地为例》(编号:40930423)、《新疆西天山北缘晚古生代斑岩-矽卡岩型铜钼铁多金属成矿与岩浆-热液作用过程》(编号:42130804)和新疆维吾尔自治区"天池英才"计划联合资助 （编号:40930423）
