摘要
大水沟碲矿床作为一种新矿床类型 ,自发现以来 ,已进行了大量的研究 ,但对其成矿过程和成矿物质来源仍有不同的认识。本次工作选取磁黄铁矿黄铁矿阶段中的 3件磁黄铁矿和辉碲铋矿阶段的 3件辉碲铋矿和 6件白云母进行成矿流体He、Ar同位素测试 ,获得3He/ 4 He比值为 0 .2～ 2 .8R/Ra ,其中磁黄铁矿的比值在 1.6～ 2 .8R/Ra之间 ,平均 2 .1R/Ra ;辉碲铋矿1.2～ 1.5R/Ra ,平均 1.3R/Ra ;白云母为 0 .2～ 2 .2R/Ra ,平均 1.1R/Ra。成矿流体的40 Ar/ 4 He比值变化较大 ,磁黄铁矿黄铁矿阶段的磁黄铁矿为 2 37～ 379,辉碲铋矿阶段的辉碲铋矿为 7～ 66。这些数据表明大水沟碲矿床在成矿过程中有大量地幔物质参与。
Since the discovery of the Dashuigou tellurium deposit,a new type of deposit,in Sichuan Province in 1993,a lot of research work has been done.However,metallogenic process and substance sources remain controversial.The authors chose three pyrrhotite samples of the pyrrhotite_pyrite stage and three tetradymite samples and six muscovite samples of the tetradymite stage to analyse their helium and argon isotopic components of fluid inclusions. 3He/ 4He ratios are 1.6～2.8 R/Ra with a mean of 2.12 R/Ra for pyrrhotite,1.2～1.5 R/Ra with a mean of 0.3 R/Ra for tetradymite,and 0.2～2.2 R/Ra with a mean of 1.1 R/Ra for muscovite. 40 Ar/ 4 He ratios of metallogenic fluids change greatly,being 237～379 for pyrrhotite of the pyrrhodtite_pyrite stage and 7～66 for tetradymite of the tetradymite stage.The data obtained suggest that large quantities of mantle fluids were involved in the metallogenic process of the Dashuigou tellurium deposit.
基金
国家自然科学基金!( 4 9672 116)
国家杰出青年基金!( 4 982 5 10 3 )资助
关键词
成矿流体
氮同位素
碲矿床
氩同位素
流体包裹体
metallogenic fluid helium_argon isotope tellurium deposit Dashuigou Sichuan Province
