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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。
In recent years, a great breakthrough has been made in geological prospecting work in Tibet. The discovery of many non-copper-bearing copper deposits makes the Duolong Mine Area well-known in the geological community. Many predecessors made a great deal of research work on the ore-forming fluids of this deposit, but there are three different opinions on the source of ore-forming fluids. This also reflects the complex ore-forming process of the Duobaoxi copper deposit Sex. Rare gas isotopes have long been used to trace the origin of the meteorites and the evolution of the oceanic lithosphere mantle. The isotopic composition and variation of carbon, hydrogen and oxygen in hydrothermal fluids are often used to analyze fluid properties and sources. On this basis, the present study complements the analysis of helium-argon isotopic compositions and hydrocarbon-oxygen isotopic composition of ore-forming fluids and points out the problems of their predecessors’ understanding of the genesis mechanism of multi-copper-free copper deposits. The reason that the rocks have the features of crust-mantle contamination is that the ore-forming fluid of this deposit mainly comes from the mantle, the ore-forming motive force mainly comes from the deep geological process, and the deposit formation is related to the mantle fluid effect.