招平断裂带脉岩群对金成矿的约束

    Relationship of dike and gold mineralization in Zhao-ping fault belt

    • 摘要: 研究表明,招平断裂带诸矿区脉岩发育,类型复杂,主要为中基性脉岩;金矿化与中基性脉岩群在走向上一致,部分矿体或沿中性脉岩与围岩的接触带分布,或产于脉岩之中;中基性脉岩与矿石具有相似的稀土元素地球化学特征,脉岩与金矿是同源的;区内中基性脉岩年龄为130M~110Ma,金成矿高峰期为120 Ma,脉岩形成年代包含了金的成矿年龄阶段,即整个金的成矿作用的同时代都有脉岩的活动;招平断裂带上金成矿作用的发生与脉岩有着时间上的相近性、空间上的相依性,以及近同源性特点,招平断裂金成矿带诸金矿床是该带中基性脉岩群构造-岩浆作用演化的直接结果。

       

      Abstract: The studies show that multitudinous vein rocks, mainly including intermediate-basic dikes, occurred in different ore deposits of Zhao-Ping Fault Belt. The gold mineralization is concord with intermediate-basic dike group for strike, and a part of the ore bodies are located on the contact zones between dike and wall rock, or occurred in dikes. The rare earth element geochemical characteristics of intermediate-basic dikes and ore are similar, which suggests that gold and vein rocks are of the same origin. The age of intermediate-basic dikes is from 110Ma to 130Ma, and the most time of the gold mineralization is 120Ma, which indicates the age of dikes-formation includes the gold ore-formation age, that is, the gold mineralization occurred during tectonic-magma evolution age of dike. There has to be the characteristic of temporal similarity, spatial harmonization and the same source of ore-forming material between gold mineralization and dikes, and the gold deposits result directly from the tectonic-magma evolution of medium-basic dike group in Zhao-Ping Fault Belt.

       

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