Geological characteristics and prospecting criteria of Tianming gold deposit along the middle part of Xuefeng arc structure belt
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摘要: 湖南省安化县天明金矿地处江南造山带雪峰弧形构造带中段,金矿成矿地质条件优越。在综合研究区域资料和勘查成果的基础上,根据地球物理、地球化学、遥感等地质资料,对比分析了天明金矿与邻区典型金矿的成矿地质环境、矿体展布、矿石特征及矿床成因特征,探讨了天明地区的成矿地质条件和找矿标志,并初步建立了天明地区金矿的成矿模式和综合找矿模型。天明金矿目前已揭露3条近EW向的破碎蚀变带,其成因类型为造山与重熔岩浆热液混合型金矿,且在垂向分带上显示出石英脉型—构造蚀变岩型的分带特征。研究成果可以为天明金矿及同类型金矿的找矿工作提供参考。Abstract: Tianming gold deposit in Anhua County of Hunan Province is located in the middle part of Xuefeng arc structure belt of Jiangnan orogenic belt, and the metallogenic geological conditions of the gold deposit are superior. On the basis of the comprehensive study of regional data and exploration results and combined with the geological data such as geophysics, geochemistry, and remote sensing, the authors compared and analyzed the metallogenic geological environment, orebody distribution, ore characteristics and genesis characteristics of Tianming gold deposit its adjacent typical gold deposits. The metallogenic geological conditions and prospecting criteria in Tianming area were discussed to preliminarily establish the metallogenic model and comprehensive prospecting model of the deposit. Three nearly EW-trending broken alteration zones in Tianming gold deposit were exposed. The genetic types of this deposit are orogenic-remelting magmatic hydrothermal type, showing the zoning characteristics of quartz vein type and structural altered rock type in the vertical zoning. The research results could provide reference for the exploration of Tianming gold deposit and similar types of gold deposits.
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