广西田东县那矿金矿区地质与地球化学特征及找矿方向

广西田东县那矿金矿位于滇黔桂金三角,属于卡林型金矿。本文在对那矿金矿区进行1∶10000地质填图的基础上,基本上查明了其成矿地质背景,结合1∶10000土壤地球化学测量,选取Au、As、Sb三种元素为成矿指示元素。通过土壤地球化学数据分析,对矿区内指示元素异常的特征、分布与地质现象进行对比分析,进行异常解释评价。研究结果显示:那矿金矿区中三叠统百逢组中上部粉砂质泥岩、泥岩、泥质粉砂岩是赋矿层位;坡表谷背斜与坡表谷断裂的复合部位为成矿有利部位;硅化、(褐)黄铁矿化、毒砂矿化、高岭石化、绢云母化、碳酸盐岩化等蚀变为金的矿化标志;圈定的Ⅰ号异常带是矿致异常,其Au元素异常规模大、品位高,是该区找矿的重点靶区。

Geological and geochemical characteristics and prospecting direction of the Nakaung gold district in Taindong county, Guangxi Province

The Nakuang gold deposit in Tiandong county of Guangxi Province is located in the gold-triangle between Yunnan, Guizhou and Guangxi, and belongs to Carlin-type gold deposits. This study has clarified the geological background and selected the favorable areas?of mineralization on the base of a mapping of 1:10000 in this area. Then using the data from soil geochemical survey of 1:10000, this work chose Au, As, and Sb as the metallogenetic indicative elements. Further analysis of these geochemical data permitted to reveal the characteristics and distribution of element anomalies and to make subsequent interpretation and evaluation coupling with geological data. The results show that the silty mudstone, mudstone and muddy sandstone are the rock formations of hosting ore in the upper Baifeng Formation of middle Jurassic. The conjunction between the Pobiaogu anticline and Pobiaogu fault is a favorable location for mineralization of gold, for which the alternations of quartz, limonite, pyrite, arsenopyrite, sericite, and kaolinite and carbonation are indicators. The gold anomaly No.1 delineated by this work is a mineralization site, which should be the prospecting target area with a large scale and high grade.