| 新疆小热泉子铜(锌)矿床同位素研究 |
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| 引用本文：陈文明.1999.新疆小热泉子铜(锌)矿床同位素研究[J].地球学报,20(4):349-356. |
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| 基金项目:国土资源部同位素地质研究开放实验室基金;国家“305”项目资助 |
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| 中文摘要:小热泉子矿床是我国最近发现的一个中型富铜( 锌) 矿床,其矿床成因为众多的矿床学家所关注。本文对该矿床中不同类型矿石、矿物的S、O、H、Si 及稀有( 惰性) 气体He、Ar 同位素特征作了较祥细的论述,同时用K Ar 法对硫化物的年龄测定进行了初步尝试。该矿床硫化物的δ34S 值为+ 1-5 ‰～+ 11-1 ‰,平均为6-15 ‰(46) ;3 He/4 He( 初始) 值为5 ×10 - 8 ～2-17 ×10 - 6 ,平均为0-64 ×10 - 6(6) ,40 Ar/36Ar 值为305-27 ～439-81 ,平均为353-57(6) ;容矿岩中石英的δ18O 值为+ 7-5 ‰～+ 11-7 ‰,平均为9-23 ‰(8) ,δ30Si 值为0 ～- 0-8 ‰,平均为- 0-3 ‰(8) ;δD值为- 66 ‰～- 121 ‰,平均为- 97 ‰(3) 。硫化物的K-Ar 法年龄主要为339-1 Ma、230-2 Ma 及98-4 Ma,这些数据均显示出该矿床的成矿物质具壳幔混合的特征,矿床的形成具同生及多次成矿作用的特点。上述资料为该矿床的成因研究提供了重要的同位素信息。 |
| 中文关键词:铜(锌)矿床 同位素 物质来源及成矿时代 小热泉子 |
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| A Study of the Isotopic Composition of the Xiaorequanzi Copper and Zinc Deposit in Xinjiang, China |
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| Abstract:The Xiaorequanzi deposit is a copper(zinc)-rich deposit recently discovered in Xinjiang, China.The ore genesis of this deposit has aroused interest from geologists. In this paper the isotopic features of sulfur, oxygen, hydrogen, silicon as well as helium and argon in sulfide minerals and their host rocks were detailedly investigated, and the K-Ar dating of sulfides was tentatively approached by the author.Of the sulfide minerals the δ 34 S values are +1.5‰～+11.1‰,averaging(46) +6.15‰, the isotope ratios of initial 3 He and 4 He are 5×10 -8 ～2.17×10 -6, averaging(6) 0.64×10 -6, and the isotope ratios of initial 40 Ar and 36 Ar are 305.27～439.81, averaging(8) 353.57. Of quartz in the host rock the δ 18 O values are +7.5‰～+11.7‰,averaging(8) +9.23‰; the δ 30 Si values are 0.00‰～-0.8‰, averaging -0.3‰; δD values are -66‰～-121‰, averaging(3) -97‰. The K-Ar age values of the sulfides are 339.1 Ma, 230.2 Ma and 98.4 Ma. The above data show that the ore sources of the copper and zinc deposit are characterized by crust-mantle mixing, and the formation of the deposit is characterized by syngenesis and multiple mineralization. |
| keywords:copper(zinc) deposit isotope material source and metallogenic epoch Xiaorequanzi |
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