江南造山带南段雪峰金矿田控矿构造解析及找矿预测

    Ore-controlling structural analysis and prospecting prediction of Xuefeng gold district in southern Jiangnan orogenic belt

    • 摘要:
      研究目的 近年来,雪峰金矿田陆续发现铲子坪、大坪、横碧洞、廖家溪等众多金矿床,这些矿床受构造控制明显,但控矿构造特征、控矿规律等尚不明确,影响了该区成矿机制研究及深部外围找矿方向的明确。
      研究方法 在野外地质调查的基础上,通过对控矿构造进行几何学、运动学、力学性质与动力学等维度的综合研究分析,揭示劈理、褶皱、断裂等构造要素的空间分布特征及其形成机制,总结构造控矿规律,提出找矿方向。
      研究结果 研究认为,雪峰金矿田的导矿构造为NE走向片理化带,NW走向张裂带是NE走向断裂的伴生构造,发育在NE走向片理化带的内部和附近。金矿主要分布于NE走向片理化带、NW走向张裂蚀变带及其两者的交会部位附近。已有成矿年代学研究表明,铲子坪和大坪金矿床形成于印支末期,雪峰金矿田在该时期的主应力σ1为NNW—SN向。
      结论 上述构造控矿研究成果表明,雪峰金矿田深部及外围具有较好的找矿空间。

       

      Abstract:
      Objective In recent years, numerous gold deposits such as Chanziping, Daping, Hengbidong and Liaojiaxi have been successively discovered in the Xuefeng gold ore field. These deposits are significantly controlled by the structure, but the characteristics and patterns of the ore-controlling structures remain unclear, which has affected the research on the mineralization mechanism in this area and the determination of the direction of deep and peripheral mineral exploration.
      Methods Based on field geological surveys, through comprehensive research and analysis of ore-controlling structures from dimensions such as geometry, kinematics, mechanical properties, and dynamics, this study reveals the spatial distribution characteristics and formation mechanisms of structural elements such as cleavages, folds, and faults, summarizes the ore-controlling structural laws, and proposes prospecting directions.
      Results It is suggested that the NE-trending schistosity zone in the ore field is the ore-conducting structure of Xuefeng gold ore field. The NW-trending extensional fracture zone is the associated structure of the NE-trending fault, which develops in or near the NE-trending schistosity zone. Gold ores are mainly distributed in the NE-trending schistosity zone, NW-trending extensinal alteration zone and the intersection of these two zones. The available geochronology data confirm that the Chanziping and Daping gold deposits were formed during the Late Indosinian period, and the principal stress (σ1) direction of Xuefeng gold ore field during this period was in the NNW−SN direction.
      Conclusions The above results on structure-controlled mineralization indicate that there is considerable prospecting potential in the deep part and peripheral areas of the Xuefeng gold ore field.

       

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