山西义兴寨金矿田成矿机理研究:来自同位素和流体包裹体的证据

发布时间：2018-06-04 15:08

本文选题：义兴寨金矿田 + 关键控矿因素　；参考：《中国有色金属学报》2017年02期

【摘要】：山西繁峙县义兴寨金矿田位于晋东北地区NW向中生代构造岩浆活动带中。以义兴寨、辛庄金矿床为研究对象,分析本区关键控矿因素、成矿物质来源、成矿流体来源及其演化,进而开展矿田成矿机理的研究。结果表明:本区构造具有多期活动的特征,规模较大的NW向区域性张性大断裂为本区的控岩、导矿及配矿构造,次级NNW向压-张扭性断裂裂隙为容矿构造,不同形式、不同级别的构造是成矿最重要的控制因素。S、Pb、H、O同位素组成及微量元素地球化学特征表明,岩浆活动为本区提供了成矿物质及成矿流体。流体包裹体特征及宏观地质特征表明,成矿过程中成矿流体发生了沸腾作用,引起CO_2、H_2S等的逸失,含金络合物稳定性遭受破坏,导致Au的大规模沉淀,流体的沸腾是矿质沉淀的主要机制。
[Abstract]:The Yixingzhai gold ore field in Fanshi County, Shanxi Province is located in the Mesozoic tectonic magmatism belt in northeast Shanxi. Taking the Yixingzhai and Xinzhuang gold deposits as research objects, this paper analyzes the key ore-controlling factors, the source of ore-forming material, the origin and evolution of ore-forming fluid in this area, and then studies the metallogenic mechanism of the ore field. The results show that the structure in this area is characterized by multi-stage activity. The large scale NW regional tensional faults are rock controlling, ore-conducting and ore-blending structures in this area, and the secondary NNW compression-tensional fracture fractures are ore-containing structures in different forms. The isotopic composition and trace element geochemical characteristics of SbPbHO are the most important controlling factors for mineralization. The magmatic activity provides the ore-forming material and ore-forming fluid for the area. The characteristics of fluid inclusions and macroscopic geological features indicate that the boiling action of ore-forming fluids occurs during the metallogenic process, resulting in the loss of COSP _ 2H _ 2S, the destruction of the stability of gold-bearing complexes, and the large-scale precipitation of au. Fluid boiling is the main mechanism of mineral precipitation.
【作者单位】：中南大学有色金属成矿预测与地质环境监测教育部重点实验室;中南大学地球科学与信息物理学院;
【基金】：中南大学创新驱动计划项目~~
【分类号】：P618.51

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