江南造山带南段雪峰金矿田控矿构造分析及找矿启示

    Ore-controlling structure analysis and prospecting instruction of Xuefeng gold field in southern section of Jiangnan Orogenic Belt

    • 摘要: 雪峰金矿田位于江南造山带南段,分布着铲子坪、大坪、横碧洞等众多金矿床。研究雪峰金矿田内的控矿构造特征、控矿规律,对江南造山带南段矿床研究及深部外围找矿具有重要的意义。通过近年开展工作的铲子坪、大坪金矿区开展矿床地质及控矿构造特征研究,结合以往资料,总结金矿床的控矿构造特征及其与金矿化的关系,阐述成矿期构造变形的应力机制和变形过程,为研究成矿过程和矿脉展布规律提供新思路。研究认为,矿田内NE向片理化带是导矿构造,NW向张裂带是NE向断裂的伴生构造,往往发育在NE向片理化带内或其附近,发育特有的皮壳状构造。金矿床主要分布于NE向片理化带、NW向张裂蚀变带及其两者的交汇部位。综合已有的成矿年代学数据,表明这些金矿床主要形成于印支末期,雪峰金矿田的主应力σ1为NW-SE方向。综合构造控矿特征和矿脉特征分析,认为雪峰金矿田深部及外围具有良好的找矿空间。

       

      Abstract: Xuefeng gold field, located at the southern section of Jiangnan Orogenic belt, including Chanziping, Daping, Hengbidong gold deposits. It is of great significance to study the ore-controlling structure characteristics and ore-controlling rules in Xuefeng gold field for the study of the southern section of Jiangnan Orogenic belt and the deep peripheral prospecting. By analyzing and studying the metallogenic geological background, ore-body characteristics and ore-controlling structural characteristics of Chanziping and Daping gold deposit, combined with the previous published data, the study summarizes the ore-controlling structural characteristics of the gold deposit and its relationship with gold mineralization, and tries to estimate the stress system and deformation process in the metallogenic period. According to the study, the NE schistoscopic zone in the ore field is the ore guide structure, and the NW schistoscopic zone is the associated structure of the NE fault, which often develops in or near the NE schistoscopic zone, and is the main ore-bearing geological body of the gold deposits in the area..In the late Indosinian period, the principal stress of Xuefeng gold field is in the NW-SE direction. Based on the structure, vein characteristics, it is considered that a good prospecting space is located in the deep of Xuefeng gold field.

       

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