山西灵丘县支家地铅锌银矿床成矿物质来源探讨
Discussion on the Ore-Forming Material Sources of the Zhijiadi Pb-Zn-Ag Deposit in Lingqiu County, Shanxi Province
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摘要: 在对支家地铅锌银矿区进行了野外调查的基础上，对支家地铅锌银矿开展了矿床地质特征、地球化学特征研究，探讨了该矿的成矿物质来源和成因，为进一步认识浅成热液多金属矿床的成矿规律及建立矿床成矿模型提供了有益的实例。通过对支家地铅锌银矿床的研究表明，支家地铅锌银矿为与隐爆作用有关的多金属矿床，工业矿体的产出严格受隐爆角砾岩体控制，矿体多产出于隐爆角砾岩、次火山岩体与白云岩接触部位、断裂构造及次级断裂构造接触部位。该规律对矿床的远景预测及找矿具有一定的指导意义。根据银矿床成矿地质背景、矿石微量元素稀土元素和同位素等方面的分析，表明该区岩浆岩的主要源区为下地壳，且混有幔源物质，为成矿模型的建立提供了依据。并对铅锌银矿床的地球化学特征及成矿物质来源进行了探讨。Abstract: Based on the field investigation of the Zhijiadi Pb-Zn-Ag deposit, the geological and geochemical characteristics of this deposit have been studied, the metallogenic material source and genesis of this deposit have been discussed, which provide scientific basis for further understanding the metallogenic regularity of epithermal polymetallic deposits and building the related metallogenic models. The results show that the Zhijiadi Pb-Zn-Ag deposit is a polymetallic deposit related to cryptoexplosive effect, and theindustrial ore-bodies are strictly controlled by cryptoexplosive breccia bodies. These ore-bodies were developed in the contact zone between cryptoexplosive breccia and/or sub-volcanic rocks and dolomite, as well as the contact site between fault structure and secondary fracture structure. This developed law of ore-bodies plays a certain guiding role in the prediction and prospecting works. According to the analysis and study on the metallogenic geological background, trace element and REE geochemical features, as well as isotopic compositions, it's believed that the magmatic rocks in this deposit were sourced from lower crust and mixed with mantle-derivedmaterials, which prove a proof for establishing the mineralization model. And then, the geochemical characteristics and ore-forming material source of this deposit have been discussed.
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Key words:
- Pb-Zn-Ag deposit /
- geochemistry /
- ore-forming material source /
- genesisofore deposit
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