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CO2、H2S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.
Yixingzhai gold ore field is located in NW-trending Mesozoic tectonic magmatic belt of the northeast region in Shanxi province. Key ore control factors, ore-forming materials, ore-forming fluid source and its evolution were studied relied on Yixingzhai and Xizhuang gold deposits. Based on these, the metallogenic mechanism of this gold ore field was studied. The results show that structures in this area have multi-phase activities characteristics, the regional NW-trending tensional fractures are the ore-transmitting structure, the secondary NW-trending tensional fractures are the ore distribution structure and the NNW-trending compressive-tensional-shearing fractures are the ore hosting structure. Different forms and different levels of structures are the most important controlling factors of mineralization. Isotopic compositions of S, Pb, H, O and trace element geochemical characteristics show that the magmatic activity of Yanshanian is the first factor of mineralization, providing massive ore forming material and ore forming fluid. The characteristics of fluid inclusions and macroscopic geological features indicate that the ore-forming fluid occurred boiling in the major metallogenic stage, which caused the loss of CO2, H2S and so on, and the stability of the gold complex was destroyed, which resulted in the large-scale precipitation of Au. The boiling action of ore-forming fluid is the main mechanism of ore material precipitation.
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