西藏多不杂铜矿床成矿流体来源探讨:来自氦氩碳氢氧同位素的证据

发布时间：2018-03-23 00:13

本文选题：氦氩同位素　切入点：碳氢氧同位素　出处：《矿物学报》2017年Z1期 　论文类型：期刊论文

【摘要】：近年来西藏地质找矿工作取得了重大突破,多不杂铜矿床的发现使得多龙矿集区在地质界里家喻户晓。前人对该矿床的成矿流体做了大量的研究工作,但在成矿流体来源认识上存在着三种不同的看法,这也从侧面反映了多不杂铜矿床的成矿作用具有复杂性。稀有气体同位素长期以来多用于示踪陨石成因、大洋岩石圈地幔演化等方面的研究,成矿热液中的碳、氢、氧同位素组成及变化特征常用于分析流体性质及来源等。在此基础上,本次研究补充分析了成矿流体的氦氩同位素组成和碳氢氧同位素组成,指出了前人在多不杂铜矿床成因机制认识中存在的问题,解释了含矿母岩具有壳幔混染特征的原因,并认为该矿床的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。
[Abstract]:In recent years, major breakthroughs have been made in the geological prospecting work in Tibet, and the discovery of the Dobu copper deposit has made the Do-long ore concentration area a household name in the geological world. However, there are three different views on the origin of ore-forming fluids, which also reflect the complexity of mineralization of Dobu copper deposit. The rare gas isotopes have long been used to trace the origin of meteorites. In the study of the evolution of oceanic lithosphere mantle, the isotopic composition and variation characteristics of carbon, hydrogen and oxygen in ore-forming hydrothermal solution are often used to analyze the properties and sources of fluids. In this study, the helium-argon isotopic compositions and hydrocarbon oxygen isotopic compositions of ore-forming fluids are analyzed, and the problems existing in the understanding of the genetic mechanism of Dobu copper deposits are pointed out, and the reason why the ore-bearing parent rocks have the characteristics of crust-mantle mixing is explained. It is considered that the ore-forming fluid of the deposit is mainly derived from the mantle, and the ore-forming power mainly comes from the deep geological process, and the formation of the deposit is related to the mantle fluid.
【作者单位】：内江师范学院地理与资源科学学院;成都理工大学地球科学学院;中国地质科学院矿产综合利用研究所;
【基金】：国土资源部公益性行业科研专项项目(编号:201011013);国土资源部构造成矿成藏重点实验室和成都理工大学矿物学岩石学矿床学国家重点(培育)学科建设项目(编号:SZD0407) 四川矿产资源研究中心资助项目(编号:SCKCZY2016-ZC03)
【分类号】：P597;P618.41

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