贵州贞丰皎贯金矿区次生晕地球化学特征及找矿方向

Geochemical Characteristics of Secondary Halo and Prospecting Direction in Jiaoguan Gold Deposit in Zhenfeng County,Guizhou Province

贞丰皎贯金矿区成矿条件十分有利,为加强区内地质找矿工作,在总结区域地质背景、矿区及矿床地质特征的基础上,结合地层地球化学、断裂构造地球化学和次生晕地球化学工作成果,详细分析了区内地层地球化学特征、断裂构造地球化学特征及次生晕地球化学特征。研究表明:(1)区内赋金层位主要为二叠系下统峨眉山玄武岩组,次为二叠系上统领薅组一段,岩性主要为凝灰质黏土岩、砂质黏土岩及粉砂岩,为主要的矿源层;(2)矿体的形成受断裂、地层、岩性、围岩蚀变等多重因素控制,断裂构造为主要控矿条件,与土壤地球化学异常的空间分布关系密切;(3)围岩蚀变以硅化、黄铁矿化、毒砂为主;(4)矿区采用次生晕扫面方法确定的异常区与地质构造、矿(化)体较吻合,且规律性较强,并通过工程验证,发现了多个矿(化)体;(5)矿区金矿与构造、蚀变密切相关,在强硅化形成的微—细石英脉与黄铁矿化、黏土化及褐铁矿化相互叠加时,金矿体品位较富,为寻找金矿的有利标志。在上述分析的基础上,进一步分析认为:(1)矿区有利的找矿标志为地层岩性、岩溶不整合面、构造、蚀变、地球化学异常等;(2)区内纳哥地段、卡务地段、佐锡拉旦沟地段金矿找矿前景较好,值得进一步开展工作。

The metallogenic conditions of Jiaoguan gold mining area in Zhenfeng County, Guizhou Province are favorable, in order to further strengthen the geological prospecting work of the area, based on analyzing the regional geological background and geological characteristics of the mining area and depos- its, combing with the working results of stratigraphic geochemistry, fracture tectonic geochemistry and secondary halo geochemistry, the stratigraphic geochemical characteristics, geochemical characteristics of fracture tectonic and geochemical characteristics of secondary halo of the mining area are discussed in detail. The study results show that ： （1）the gold-bearing strata of the mining area is mainly occurred in Emeis- han Basalt Group of Lower Permain, and secondary for a period of Linghao Formation Group of Upper Permain, the lithology are mainly for tuffaceous clay rock, sandy clay rock and sihstone,which are main mineral source layer;（2）the formation of the ore-bodies is controlled by the multiple factors such as fracture, strata, lithology and surrounding rock alteration, the fracture tectonic is the main ore-controlling condition, which is closely related to the spatial distribution of soil geochemical anomalies ; （3）the surrounding alterations are mainly for silicide, pyritization and arsenopyrite;（4）the anomalies areas determined by adopting the secondary halo sweeping method are basically consistent with the geological tectonics and ore-bodies （mineralized bodies）, and the anomaly distribution regularities are significant, and manly mineralized bodies are found in the anomalies by conducting engineering verification;（5）the gold deposits in the min- ing area are closely related to the tectonics and alterations, the area overlapped by of micro-fine quartz vein formed in strong silicified and pyritization, clay and ferritization is more rich for gold element,which is the favorable prospecting indicator of gold deposits. Based on the above analysis results, the further dis- cussion results indicated that ： （1）the favorable prospecting indicators of the mining area are mainly for strata lithology, karst unconformable surface, tectonic, alteration and geochemical anomaly ; （2）the prospecting potential of Nage area, Kawu area and Zuoxiladangou area are good, it is necessary to conduct further prospecting and exploration work in the areas.