| 西藏多不杂铜矿床硫铅同位素地球化学示踪 |
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| 引用本文： | 何阳阳,温春齐,刘显凡.西藏多不杂铜矿床硫铅同位素地球化学示踪[J].岩石矿物学杂志,2016,35(5):855-862. |
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| 作者姓名： | 何阳阳 温春齐 刘显凡 |
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| 作者单位： | 内江师范学院 地理与资源科学学院, 四川 内江 641112;成都理工大学 地球科学学院, 四川 成都 610059;成都理工大学 地球科学学院, 四川 成都 610059;成都理工大学 地球科学学院, 四川 成都 610059 |
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| 基金项目： | 国土资源部公益性行业科研专项资助项目（201011013）；内江师范学院博士科研启动费资助项目（15B09） |
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| 摘 要： | 多不杂铜矿床的发现是西藏地质找矿工作取得的重大突破,前人对其做了大量的研究,但始终未能合理解释该矿床的形成过程,究其原因主要是因为成矿物质和成矿流体来源认识上存在争议。本次研究指出了前人在多不杂铜矿床成因机制认识中存在的问题,并测试了岩矿石及单矿物的硫铅同位素组成。研究表明,矿床中硫主要来源于深源岩浆,幔源岩浆和流体在参与成岩成矿过程中伴随岩浆结晶成岩交代岩石而致自身流体性质演变,进而引发壳幔物质混染;铅同位素具有由岩浆作用形成的地壳与地幔混合的俯冲带铅的特征,伴随着含矿地幔流体的上升侵位,不可避免的混染了地壳铅,导致了多不杂铜矿床铅同位素组成的变化。综合分析认为该矿床的成矿物质和成矿流体主要来源于地幔,成矿动力主要来自深部地质过程,矿床的形成与地幔流体作用有关。
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| 关 键 词： | 硫铅同位素 地球化学示踪 多不杂铜矿床 西藏 |
| 收稿时间： | 2016/5/17 0:00:00 |
| 修稿时间： | 2016/8/10 0:00:00 |
Sulfur and lead isotope geochemical tracing of the Duobuza copper deposit, Tibet |
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| HE Yang-yang,WEN Chun-qi and LIU Xian-fan.Sulfur and lead isotope geochemical tracing of the Duobuza copper deposit, Tibet[J].Acta Petrologica Et Mineralogica,2016,35(5):855-862. |
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| Authors: | HE Yang-yang WEN Chun-qi and LIU Xian-fan |
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| Institution: | College of Geography & Resource Science, Neijiang Normal University, Neijiang 641112, China;College of Geosciences, Chengdu University of Technology, Chengdu 610059, China;College of Geosciences, Chengdu University of Technology, Chengdu 610059, China;College of Geosciences, Chengdu University of Technology, Chengdu 610059, China |
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| Abstract: | The discovery of the Duobuza copper deposit is a major breakthrough of geological prospecting work in Tibet. Previous studies have done a lot of research, but failed to explain the formation process of the deposit. The reason is mainly because of the controversy in the understanding of the source of ore-forming materials and ore-forming fluids. In this study, the authors pointed out the problems existing in the understanding of the genetic mechanism of the Duobuza copper deposit, and investigated the sulfur and lead isotopic compositions of rocks and minerals. It is shown that, in the ore-forming and rock-forming process, the major source of sulfur in magma, mantle-derived magma and fluid experienced component evolution resulting from magmatic crystallization and rock metasomatism, thus triggering the contamination of the crust and the mantle. Lead isotope was characterized by the subduction zone lead formed by the magma activity of the crust and the mantle, which was accompanied by the increase of the ore-bearing mantle fluid and led to the change of lead isotopic composition of the Duobuza copper deposit. Comprehensive analysis shows that the ore-forming material and the ore-forming fluid were mainly derived from the mantle, the metallogenic dynamics was mainly from deep geological process, and the formation of the ore deposits was related to mantle fluid metasomatism. |
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| Keywords: | sulfur-lead isotope geochemical tracing Duobuza copper deposit Tibet |
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