(1. 中南大學 有色金屬成礦預(yù)測教育部重點實驗室，長沙 410083；
2. 中南大學 地球科學與信息物理學院，長沙 410083；
3. 湖南省有色地質(zhì)勘查研究院，長沙 410015)
摘 要: 對沃溪金銻鎢礦床含金石英脈流體包裹體溫度、成分進行研究，并結(jié)合井下礦體特征對流體來源及礦床成因進行了探討。結(jié)果表明，沃溪礦區(qū)含金石英脈中的流體包裹體均為LV型富液相原生包裹體，并具有中低溫(均一溫度集中在170~220 ℃之間)、低鹽度(3%~6%，質(zhì)量分數(shù))及低密度(0.88~0.92 g/cm3)的特征。從包裹體成分上看，流體包裹體同時具有變質(zhì)流體(中溫、低鹽度、高CO2含量)與大氣降水w(Na+)/w(K+)＞2，w(F-)/w(Cl-)≥1，明顯地富集Ca+(w(Ca+)＞w(Na+)＞w(K+))或Ca+含量較高(w(Na+)＞w(Ca+)＞w(K+))的成分特征，顯示可能為混合流體；從礦脈地質(zhì)特征來看，沃溪礦區(qū)礦脈既發(fā)育順層脈體，又發(fā)育切層脈體，亦顯示變質(zhì)分異與熱液充填的特征。
關(guān)鍵字: 湘西沃溪金銻鎢礦床；流體包裹體；成礦流體來源；礦床成因
（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
