黔西南泥堡金矿床大型隐伏金矿体地质特征研究

泥堡金矿区Ⅲ号金矿体是近年来发现的受断裂控制的大型隐伏矿体，是泥堡金矿区找矿勘探工作的重大突破。该矿体受F1断层控制，其容矿岩石为蚀变沉凝灰岩。蚀变沉凝灰岩普遍发育粘土化、碳酸盐化，而与金矿化密切关联的蚀变类型为黄铁矿化、硅化，次为毒砂化。对泥堡金矿床产出特征进行分析发现，Ⅲ号矿体明显受构造（F1断层）、地层（P3l2）和岩性（蚀变沉凝灰岩）控制。结合矿床赋矿岩石、矿物组合和控矿因素分析，认为泥堡金矿的形成与晚二叠世沉积火山凝灰质密切相关，F1断层活动及燕山期热水（液）作用是Ⅲ号金矿体成矿的关键。通过对比分析，认为区域上车榔—泥堡—三道沟—潘家庄一线是寻找类似金矿体（断控型）的重要区域，龙潭组二段及蚀变沉凝灰岩是重要的找矿标志。

Geological features of large concealed gold orebody from the Nibao gold deposit, southwestern Guizhou Province

The gold orebody No. III in the Nibao deposit of southwestern Guizhou Province is a recently discovered large concealed gold ore body controlled by faults, and it is a major prospecting breakthrough in the Nibao ore district. This orebody is controlled by F1 fault, and the ore-hosting rock is altered sedimentary tuff. The altered sedimentary tuff includes clayization and carbonization, and pyritization and silicification are closely associated with gold mineralization, followed by arsenopyrite. Analysis of geology characteristics of the gold deposit shows that the ore body III is significantly controlled by tectonic fault (F1), formation (P3l2) and lithology (altered sedimentary tuff). Integrated with analysis of host rock, mineral assemblage and ore-controlling factors, we infer that the formation of gold deposit is closely related to the late Permian volcanic tuff, and the activity of F1 fault and the hot water (liquid) in Yanshanian period are key factors for the gold mineralization. The Shangchelang-Nibao-Sandaogou-Panjiazhuang area has a great potential for prospecting similar ore bodies (fault controlled type), and the second number of the Longtan formation and altered sedimentary tuff are the main prospecting indicators.