| 大水沟碲矿床流体包裹体的He、Ar同位素组成及其示踪成矿流体的来源 |
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| 引用本文：毛景文,魏家秀.2000.大水沟碲矿床流体包裹体的He、Ar同位素组成及其示踪成矿流体的来源[J].地球学报,21(1):58-61. |
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| 基金项目:国家自然科学基金(49672116)，国家杰出青年基金(49825103) |
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| 中文摘要: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。 |
| 中文关键词:成矿流体 He、Ar同位素 碲矿床 四川省大水沟 |
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| Helium and Argon Isotopic Components of Fluid Inclusions and Tracing to the Source of Metallogenic Fluids in the Dashuigou Tellurium Deposit of Sichuan Province |
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| Abstract: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. |
| keywords:metallogenic fluid helium-argon isotope tellurium deposit Dashuigou Sichuan Province |
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