Noble Gas Isotopic Tracing of Ore-Forming Fluids in Limu Tin-Niobium-Tantalum Deposit
详细信息
- 责任者：Liang Linghui (College of Resources and Metallurgy ; Guangxi University ; Nanning 530004 ; China) ; Peng Zhenan
- 刊名：Mineral Deposits
- 出版年：2013
- 卷期：32(2)
- 关键词：锡矿 ; tin ores ; 铌矿 ; niobium ores ; 钽矿 ; tantalum ores ; 广西 ; Guangxi Province
- 页码：p.397-404
- 图表：illus., 3 tables, 43 refs.
- 分类号：1001
- issnNo：ISSN0258-7106
- isbnNo：CN11-1965/P
摘要
In this paper,ore-forming fluids and ore genesis are discussed based on the analyses of noble gases isotopes of fluid inclusions trapped in pyrite.3He/4He ratios of fluids in the Limu tin-niobium-tantalum deposit are 0.14~0.97 Ra(under 1.0 Ra).These values are smaller than values of mantle fluids and are close to the values of atmosphere saturated water and crust fluids.40Ar/36Ar ratios of fluids are 555.98~855.11 with an average of 705.55,far away from Ar isotopic composition of atmosphere.40Ar*/4He ratios of fluids are 0.08~0.27 with an average of 0.153,close to the values of the crust and lower than the values of crust fluids.20Ne/22Ne ratios are 9.671~9.748,21Ne/22Ne ratios are 0.0306~0.0330,having the characteristics of the atmosphere saturated water.He-Ar isotope composition shows that ore-bearing fluids in the Laohutou,Niulanling and Jinzhuyuan deposits were mainly mixed with the atmosphere saturated water and the crust fluids.The data obtained suggest that the ore-bearing fluids were mainly derived from the atmosphere saturated water and the crust fluids,with some mantle fluids probably involved in the ore-forming process of the Shuiximiao deposit.