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大兴安岭南段红岭铅锌多金属矿床两期成矿作用的岩相学证据及地质意义

Lithofacies Evidence and Geological Significance of Two-stage Mineralization in the Hongling Polymetallic Pb-Zn Deposit, Southern Greater Khingan Range

  • 摘要: 红岭铅锌多金属矿床是多期构造-岩浆-热液叠加成矿的典型代表,研究其复杂成因对深入理解区域成矿规律和指导找矿勘查具有重要意义。为准确识别红岭铅锌多金属矿床成矿期次与成矿阶段,在野外地质调查基础上,开展了系统岩相学、矿相学观察。结合矿物共生组合、结构构造及流体演化特征,识别出红岭铅锌多金属矿床存在两期主要矿化作用,并进一步划分为6 个成矿阶段。研究结果表明,第一期成矿作用伴随早白垩世花岗岩侵位,经历了矽卡岩阶段、氧化物阶段、硫化物阶段至碳酸盐阶段典型热液演化序列;第二期成矿作用表现为石榴子石-磁铁矿脉及铅锌-碳酸盐脉穿插、叠加于早期矿体之上,揭示了至少两期相对独立但成因关联的热液系统。红岭铅锌多金属矿床的两期叠加成矿特征指示深部可能存在不同阶段的矿化中心,找矿方向应聚焦于两期矿化叠加部位,尤其是早期矽卡岩-磁铁矿体与后期硫化物脉的交切带。研究成果为大兴安岭南段区域成矿系列、深化矽卡岩型矿床成因认识及指导深边部勘查提供了重要依据。

     

    Abstract: The Hongling lead-zinc deposit in the southern Great Xing'an Range serves as a typical example of multistage tectono-magmatic-hydrothermal superimposed mineralization. Its complex genesis is of significant importance for deepening the understanding of regional metallogeny and guiding prospecting and exploration. Based on systematic field geological investigations and petrographic as well as ore microscopic observations, combined with analysis of mineral paragenesis, textures and structures, and fluid evolution characteristics, this study identifies two main mineralization episodes in the Hongling deposit, which are further subdivided into six metallogenic stages. The results indicate that the first mineralization episode, associated with the emplacement of Early Cretaceous granite, underwent a complete hydrothermal evolution sequence typical of skarn-type deposits, progressing through the skarn stage, oxide stage, sulfide stage, and the carbonate stage. The second mineralization episode is manifested by garnet-magnetite veins and Pb-Zn-carbonate veins that cut through and overprint the earlier ore bodies, revealing at least two relatively independent yet genetically linked hydrothermal systems. The multistage superimposed mineralization characteristics of the Hongling deposit suggest the potential existence of mineralization centers from different stages at depth. Prospecting efforts should therefore focus on zones where mineralizations from different episodes overlap, particularly the intersection zones between early skarn-magnetite orebodies and later sulfide veins. Concurrently, careful discrimination of the alteration features associated with hydrothermal activities of different episodes is essential. This study provides important constraints for refining the regional metallogenic series in the southern Great Xing'an Range, enhancing the genetic understanding of skarn-type deposits, and guiding deep and peripheral exploration.

     

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