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    陕西凤太矿集区钠长(角砾)岩钴镍元素赋存与富集规律研究

    Study on the occurrence and enrichment regularity of cobalt and nickel in albitite (breccia) rock in Fengtai ore concentration area, Shaanxi Province

    • 摘要: 陕西凤县—太白地区是我国重要的多金属矿集区,为探究该区钠长(角砾)岩型钴镍矿赋存规律,以区内双王及青崖沟地区钠长(角砾)岩带为研究对象,通过野外地质调查、地球化学剖面测量及岩相学分析研究,揭示其成矿特征与元素分布规律。地球化学分析表明,黄铁矿脉胶结型角砾岩中Co、Ni平均含量分别为710 ppm、900 ppm;而黄铁矿化蚀变岩中Co、Ni平均含量分别达790 ppm、1300 ppm,表现出更高的富集特征。并且,多期次热液活动使黄铁矿内Ni元素呈现继承性富集特征;Co元素的分布则明显受控于热液物理化学条件,表现出显著的差异性富集与亏损。基于上述分析,认为凤太矿集区钠长(角砾)岩型钴镍矿化与黄铁矿化作用在空间与成因上密切相关,且多阶段热液的叠加是导致镍持续富集及钴选择性迁移沉淀的关键因素。

       

      Abstract: The Fengtai area is an important polymetallic ore concentration area in China. In order to explore the occurrence law of albite (breccia) cobalt-nickel deposits in this area, this study takes the albite (breccia) rock belt in Shuangwang and Qingyagou areas of the basin as the research object, and reveals its metallogenic characteristics and element distribution law through field geological survey, geochemical profile measurement and petrographic analysis. Geochemical analysis shows that the average contents of Co and Ni in-pyrite-vein-cemented breccia are 710 ppm and 900 ppm, respectively. The average contents of Co and Ni in pyritization altered rocks are 790 ppm and 1300 ppm, respectively, showing higher enrichment characteristics. In addition, multi-stage hydrothermal activities resulted in the inherited enrichment of Ni in pyrite, while the distribution of Co was significantly controlled by hydrothermal physical and chemical conditions, exhibiting marked differentiation in enrichment and depletion. Based on the above analysis, it is considered that the cobalt-nickel mineralization of albite (breccia) type in Fengtai area is closely related to pyritization in space and genesis, and the superposition of multi-stage hydrothermal fluids is the key factor leading to the continuous enrichment of nickel and the selective migration and precipitation of cobalt.

       

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