湘西沃溪金锑钨矿床流体包裹体特征及矿床成因
来源期刊：中国有色金属学报2013年第9期
论文作者：彭南海 黄德志 辛宇佳 刘忠法 柳永康
文章页码：2605 - 2613
关键词：湘西沃溪金锑钨矿床；流体包裹体；成矿流体来源；矿床成因
Key words：Woxi Au-Sb-W despite in western Hunan; fluid inclusions; ore-forming fluid origin; deposit genesis
摘 要：对沃溪金锑钨矿床含金石英脉流体包裹体温度、成分进行研究，并结合井下矿体特征对流体来源及矿床成因进行了探讨。结果表明，沃溪矿区含金石英脉中的流体包裹体均为LV型富液相原生包裹体，并具有中低温(均一温度集中在170~220 ℃之间)、低盐度(3%~6%，质量分数)及低密度(0.88~0.92 g/cm3)的特征。从包裹体成分上看，流体包裹体同时具有变质流体(中温、低盐度、高CO2含量)与大气降水w(Na+)/w(K+)＞2，w(F-)/w(Cl-)≥1，明显地富集Ca+(w(Ca+)＞w(Na+)＞w(K+))或Ca+含量较高(w(Na+)＞w(Ca+)＞w(K+))的成分特征，显示可能为混合流体；从矿脉地质特征来看，沃溪矿区矿脉既发育顺层脉体，又发育切层脉体，亦显示变质分异与热液充填的特征。
Abstract: The study on the composition and temperature of fluid inclusions inside quartz-vein from Woxi Au-Sb-W deposit and wild observation of the relationships between quartz veins and ore body were carried out to discuss the origin of ore-forming fluid and deposit genesis. The results indicate that, in Woxi mine area, fluid inclusions in gold-bearing quartz veins are all LV-type liquid-rich ones, and the fluid has the characteristics of moderate or low temperature (in homogeneous temperature range of 170-220 ℃), low salinities (3%-6%, mass fraction) and low density (0.88-0.92 g/cm3). The composition of fluid inclusions of Woxi Au-Sb-W deposit shows that they have characteristics of both metamorphic water (moderate temperature, low salinity and high content of CO2) and meteoric water (w(Na+)/w(K+)＞2, w(F-)/w(Cl-)≥1, w(Ca+)＞w(Na+)＞w(K+) or w(Na+)＞w(Ca+)＞w (K+)), which represents mixing of metamorphic water and meteoric water. The study of quartz veins shows that veins and bedded veins both exist in Woxi Au-Sb-W deposit, which also represents characteristics of both metamorphic deposit and mesothermal deposit related to meteoric water.
彭南海1, 2, 3，黄德志1, 2，辛宇佳1, 2，刘忠法1, 2，柳永康1, 2
(1. 中南大学 有色金属成矿预测教育部重点实验室，长沙 410083；
2. 中南大学 地球科学与信息物理学院，长沙 410083；
3. 湖南省有色地质勘查研究院，长沙 410015)
摘 要：对沃溪金锑钨矿床含金石英脉流体包裹体温度、成分进行研究，并结合井下矿体特征对流体来源及矿床成因进行了探讨。结果表明，沃溪矿区含金石英脉中的流体包裹体均为LV型富液相原生包裹体，并具有中低温(均一温度集中在170~220 ℃之间)、低盐度(3%~6%，质量分数)及低密度(0.88~0.92 g/cm3)的特征。从包裹体成分上看，流体包裹体同时具有变质流体(中温、低盐度、高CO2含量)与大气降水w(Na+)/w(K+)＞2，w(F-)/w(Cl-)≥1，明显地富集Ca+(w(Ca+)＞w(Na+)＞w(K+))或Ca+含量较高(w(Na+)＞w(Ca+)＞w(K+))的成分特征，显示可能为混合流体；从矿脉地质特征来看，沃溪矿区矿脉既发育顺层脉体，又发育切层脉体，亦显示变质分异与热液充填的特征。
关键词：湘西沃溪金锑钨矿床；流体包裹体；成矿流体来源；矿床成因
PENG Nan-han1, 2, 3, HUANG De-zhi1, 2, XIN Yu-jia1, 2, LIU Zhong-fa1, 2, LIU Yong-kang1, 2
(1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Hunan Nonferrous Metals Geological Exploration Institution, Changsha 410015, China)
Abstract:The study on the composition and temperature of fluid inclusions inside quartz-vein from Woxi Au-Sb-W deposit and wild observation of the relationships between quartz veins and ore body were carried out to discuss the origin of ore-forming fluid and deposit genesis. The results indicate that, in Woxi mine area, fluid inclusions in gold-bearing quartz veins are all LV-type liquid-rich ones, and the fluid has the characteristics of moderate or low temperature (in homogeneous temperature range of 170-220 ℃), low salinities (3%-6%, mass fraction) and low density (0.88-0.92 g/cm3). The composition of fluid inclusions of Woxi Au-Sb-W deposit shows that they have characteristics of both metamorphic water (moderate temperature, low salinity and high content of CO2) and meteoric water (w(Na+)/w(K+)＞2, w(F-)/w(Cl-)≥1, w(Ca+)＞w(Na+)＞w(K+) or w(Na+)＞w(Ca+)＞w (K+)), which represents mixing of metamorphic water and meteoric water. The study of quartz veins shows that veins and bedded veins both exist in Woxi Au-Sb-W deposit, which also represents characteristics of both metamorphic deposit and mesothermal deposit related to meteoric water.
Key words:Woxi Au-Sb-W despite in western Hunan; fluid inclusions; ore-forming fluid origin; deposit genesis
