锡矿山式锑矿床的成矿流体研究

锡矿山式锑矿床是已发现的锑矿床的重要类型之一。其成矿流体的研究对阐明该类型锑矿床形成的地球化学机理具有重要的理论意义。本文主要根据稀土元素、微量元素及稳定同位素等地球化学数据分析了成矿流体运移的趋势。结果表明 ,锑大多由地球深部提供 ;成矿介质流体以深部上升流体为主 ,并有一定量的大气降水参与。矿化剂既有来源于周围地层岩石的 ,又有来自地球深部的。还探讨了锑的迁移沉淀机制。成矿早阶段流体贫硫 ,使锑主要呈Sb(OH) 03,其余呈Sb2 S2 (OH) 02 形式迁移。至成矿中 晚阶段流体硫相对增高 ,锑大多呈HSb2 S-4、少量呈Sb2 S2 -4形式迁移。锑配合物主要由于成矿流体温度、压力和pH值的突然降低而被分解或酸化 ,从而导致辉锑矿的析出

The Ore-Forming Fluids of Xikuangshan-Type Antimony Deposits

Xikuangshan type antimony deposits are an important type of antimony deposits.The study of mineralizing fluids is of great throretical importance to expound the geochemical mechenism to form the typy of antimony deposits.This paper has analysed the migration tendency of mineralizing fluids using geochemical data,such as rare earth element,trace element,stable isotope and so on.Antimony element originated mainly from the earth's deep parts.Mineralization medium fluids take fluids ascending from the depth as dominant facto,and there are certain amounts of meteoric water in it.Mineralizer derived not only from near statum rocks,but also from the earth's deep parts. The transfer and precipitating mechanism of antimony is also inquired into.At the early stage of mineralization,its fluids were poor in sulfur.So ontirnony was transported in the forms of Sb(OH) 0 3 ,then in the forms of Sb 2 S 2 (OH) 0 2 .At the middle late stage of mineralization,sulfur in fluids increased relatively.So,the most of antimony was transfered in the forms of HSb 2 S 2- 4 ,and minority is in the forms of Sb 2 S 2 4 .Above mentioned complex compounds were dissolved and acidated because of sudden decrease of tempreture,pressure and pH.Thus there occured a great deal of stibnite.