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    东秦岭马家坪地区花岗伟晶岩型铍矿地质特征与成矿规律研究

    Geological characteristics and metallogenic regularity of granitic pegmatite-type beryllium deposits in the Majiaping area, Eastern Qinling

    • 摘要: 东秦岭商丹地区是花岗伟晶岩型铍矿的重要成矿区段。通过系统收集前人研究成果,结合对马家坪地区街子沟和金山典型铍矿床的野外地质调查与岩石学分析,总结了商丹地区花岗伟晶岩型铍矿的空间分布、内部结构分带特征及成矿规律。研究区内铍矿体主要赋存于古元古代秦岭岩群郭庄组变质岩系中的伟晶岩脉内,受背斜次级断裂和层间裂隙控制,伟晶岩脉走向与区域构造线一致。通过对比分析商丹地区铍矿地质特征,铍成矿在时间上主要形成于伟晶岩演化后期的石英-白云母阶段;空间上绿柱石优先富集于分带良好、规模较大的伟晶岩脉石英-白云母-钠长石中间带;赋矿特征显示铍以绿柱石形式产出,其富集强度与钠长石化、白云母化发育程度密切相关。该研究成果为东秦岭商丹地区花岗伟晶岩型铍矿的进一步勘查与成矿预测提供了地质依据。

       

      Abstract: The Shang-Dan regions in the Eastern Qinling constitutes a pivotal metallogenic sector for granitic pegmatite-type beryllium deposits. Based on systematic compilation of previous research, combined with field geological surveys and petrological analyses of the Jiezigou and Jinshan typical beryllium deposits in the Majiaping area, this study summarizes the spatial distribution, internal zonation characteristics, and metallogenic regularities of these deposits. The beryllium orebodies are dominantly hosted in pegmatite veins in the metamorphic rock series of the Paleoproterozoic Guozhuang Formation of the Qinling Group, structurally contronlled by secondary faults branching from the anticline and by interlayer fissures, with the vein strikes consistent with the regional tectonic trend.Comparative analysis of the geological features indicates that, temporally, Be mineralization was mainly formed during the quartz-muscovite stage, which corresponds to the late-stage evolution of pegmatite melts; spatially, beryl is preferentially enriched in the quartz-muscovite-albite intermediate zones within well-zoned, large-scale pegmatite veins. Ore characteristics indicate that beryllium occurs mainly as beryl, and its enrichment intensity is closely related with the degree of albitization and muscovitization. These results provide a geological basis for the further exploration and metallogenic prediction of granitic pegmatite-type beryllium deposits in the Shang-Dan region of Eastern Qinling.

       

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