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湖北崇阳南部高枧卡林型金矿特征及指示意义

Characteristics and indicative significance of Gaojian Carlin-type Gold Deposits in southern Chongyang, Hubei Province

  • 摘要: 崇阳南部位于长江中下游钨、金多金属成矿带,具有较好的金矿成矿潜力。该地区以寒武系—奥陶系地层为主,地质勘查和样品分析结果表明,Au异常主要赋存在奥陶系下统留咀桥组上段的层间破碎带中,留咀桥组与上覆宁国组粉砂质页岩呈整合接触,二者之间发育明显的构造蚀变带,以黄铁矿化、毒砂和菱铁矿化为主要特征,且Au、As、Sb等元素显著富集,显示出典型卡林型金矿地球化学组合特征。区域内北东向深大断裂发育,规模较大,为主要的控岩−控矿构造。灰岩与粉砂质页岩、含灰岩扁豆体粉砂质页岩和砂岩之间由于存在明显的能干性差异,在后期地质演化中发生了顺层滑动,为含矿热液运移和导矿通道形成创造了良好条件,区域背斜轴部和伴生构造(节理、劈理)为后期金富集和物质交换提供了客观条件。综合研究表明,高枧金矿属于受层间破碎带控制的卡林型金矿。深部隐伏岩体与成矿流体来源是成矿的关键驱动,未来找矿突破应聚焦于对深部岩浆作用的探查及卡林型金成矿模型的深入验证,这对圈定鄂南地区同类金矿找矿靶区具有重要指导意义。

     

    Abstract: The southern Chongyang area is located within the Middle−Lower Yangtze River W−Au polymetallic metallogenic belt, exhibiting favorable gold mineralization potential. The area is dominated by Cambrian−Ordovician strata. Geological exploration and sample analyses indicate that Au anomalies are primarily hosted in the interlayer fracture zones of the upper member of the Lower Ordovician Liuzuiqiao Formation, which conformably contacts the silty shale of the overlying Ningguo Formation. A distinct structural alteration zone is developed between the two formations, characterized mainly by pyritization, arsenopyritization, and sideritization. Notably, elements such as Au, As, and Sb are significantly enriched, reflecting a typical geochemical association of Carlin-type gold deposits. Regionally, large-scale NE-trending faults are well-developed and serve as the principal rock- and ore-controlling structures. Due to marked competence contrasts between limestone and silty shale, silty shale with limestone lenses, and sandstone, bedding-parallel sliding has occurred during later geological evolution, creating favorable pathways for the migration of ore-forming fluids and the formation of ore-conducting channels. Regional anticlinal axes and associated structures (joints and cleavages) provide additional settings for gold enrichment and material exchange. Comprehensive studies suggest that Gaojian Gold Deposit is a Carlin-type gold deposit controlled by interlayer fracture zone. Deep-seated concealed intrusions and ore-forming fluid sources are key drivers of mineralization. Future ore-prospecting breakthroughs should focus on exploring deep magmatic activity and further validating the Carlin-type mineralization model, which will provide important guidance for delineating gold exploration targets in similar areas of southern Hubei.

     

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