雪峰弧形构造带中段枫溪江金矿地质特征与找矿标志

    Geological characteristics and prospecting indicators of Fengxi river gold deposit in the central segment of Xuefeng arcuate tectonic belt

    • 摘要: 湖南省隆回县枫溪江金矿位于江南造山带雪峰弧形构造带中段,该构造带经历了多期构造-岩浆活动与区域变质作用的叠加改造,是华南地区重要的金多金属成矿远景区,其成矿背景与成矿条件备受关注。在综合区域地质资料与勘查成果的基础上,结合地球物理、地球化学、槽探、钻探等数据,系统探讨枫溪江金矿的成矿地质条件与找矿标志。结果显示: 枫溪江金矿目前已揭露7条矿脉和矿化带,矿化主要赋存于青白口系浅变质碎屑岩与南华系火山-沉积岩接触带及层间破碎带中,围岩蚀变以中-强硅化、黄铁矿化为特征; 圈定化探Au异常7个、As异常6个,组合异常4个。构建了涵盖地层、构造、矿物学、物探异常、化探异常、重砂及老硐的综合找矿标志体系,明确了青白口系—南华系接触带、高极化-中低阻物探异常、Au-As组合异常、强硅化-黄铁矿化-毒砂化为核心找矿识别依据。研究成果可为矿区后续找矿部署及区域同类型金矿勘查提供参考。

       

      Abstract: Fengxi river gold mine in Longhui County of Hunan Province is located in the central segment of Xuefeng arcuate tectonic belt within Jiangnan Orogenic Belt, which had undergone multiple phases of tectonic-magmatic activity and regional metamorphism, making it a significant polymetallic gold metallogenic prospecting area in South China. Based on comprehensive regional geological data and exploration results, and combined with geophysical, geochemical, trenching, and drilling data, the authors in this research systematically investigated the metallogenic geological conditions and prospecting indicators of Fengxi river gold mine. The results showed that 7 ore veins and mineralized zones had been exposed at Fengxi river gold mine, and the mineralization was mainly hosted in the contact zones between the shallow-metamorphosed clastic rocks of Qingbaikou System and the volcanic-sedimentary rocks of Nanhua System, as well as interlayer fault zones. The wall rock alteration featured moderate to strong silicification and pyritization. Seven Au anomalies and six As anomalies were delineated, forming four combined anomalies. Additionally, a comprehensive prospecting indicator system was established, including stratigraphy, structure, mineralogy, heavy minerals, geophysical anomaly, geochemical anomaly, and old workings. The stratigraphic contact between Qingbaikou System and Nanhua System, high polarizability-medium-low resistivity geophysical anomaly, Au-As association geochemical anomaly, strong silicification-pyritization-arsenopyritization were identified as core prospecting markers. The research findings could provide basis for subsequent prospecting deployments and regional exploration of similar gold deposits in this area.

       

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