湘西南金矿床地球化学特征及其成因  

Geochemical characteristics and ore genesis of gold deposits in southwestern Hunan Province

作　　者：彭建堂[1] 胡瑞忠[1] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放实验室,贵阳550002

出　　处：《地球化学》1999年第5期464-472,共9页Geochimica

摘　　要：对湘西南金矿床的研究表明， 五强溪组为金的主要矿源层， 其形成的大地构造环境为活动大陆边缘；金矿床中Ｐｂ 、Ｓ、Ｓｒ 的同位素组成特征反映它们均来自赋矿围岩；成矿流体的组成和Ｈ、Ｏ 同位素特征指示其主要来自大气降水；成矿流体显示出低温、低盐度、中等密度、低氧逸度、呈中性—弱碱性的特征；成矿时代为加里东期，而非传统认识中的武陵雪峰期；矿床成因为大气降水热液改造成因。The geochemical study indicates that Wuqiangxi Formation, formed at the active continental margin, is the gold sourcebed in southwestern Hunan. It is revealed that Pb, S, Sr isotopes of gold deposits in this area originate from the host rocks. The composition of ore forming fluid and its H, O isotope features reveal its origin of meteoric water, and the ore forming fluid is characterized by the low temperature, low salinity, medium density, low oxygen fugacity, medium weakly alkaline. Gold mineralization in this area took place in Caledonian period rather than in Wuling Xuefeng periods or Yanshanian period as expected, and its ore genesis can be placed into the meteoric hydrothermal reworking deposit.

关 键 词：金矿床 地球化学特征 矿床成因论 湖南省 

分 类 号：P618.510.4[天文地球—矿床学] P618.510.1[天文地球—地质学]