摘要
广西西大明山地区是广西重要的整装勘查区之一。区内与岩浆活动密切相关的内生矿床丰富,然而仅在局部地表上发现少量的小型岩脉,区内隐伏岩体的预测研究一直是个热点。文章借助广西大规模地质矿产勘查项目,在成岩成矿理论的指导下,通过对区域地质、地球物理、地球化学及遥感等特征的系统分析,确定了西大明山地区深部隐伏岩体的大致分布范围和埋藏深度。在区内选定了埋藏较浅的隐伏岩体预测靶区,有针对性地采取了高精度的地、物、化等方法圈定隐伏岩体的具体位置,经验证有ZK31901、ZK40004两个钻孔分别在500m和960m以下发现了隐伏的黑云母花岗闪长岩,同时在隐伏岩体上部发现了具有工业价值的罗维钨铋矿床。预测靶区验证钻孔成功发现岩体,不仅为相邻地区的隐伏岩体预测工作提供了典型的范例,而且对西大明山地区成矿系统、矿床成因的研究乃至找矿勘查工作具有重要意义。
The West Damingshan district is one of the most important integrated exploration areas in Guangxi Province,which hosts many endogenetic deposits closely related to magmatic activity. While only a few of small dikes are found on the surface,and prediction of subsurface concealed magmatic bodies remains a difficult issue all the time. In this work,under the guidance of diagenetic mineralization theory and contributed by the project of Largescale Geological and Mineral Recourse Exploration in Guangxi,we have made an integrated analysis of the regional features of geology,geophysics,geochemistry and remote sensing data of this area. The distribution ranges and buried depths of the concealed magmatic bodies in the study area are determined. Shallow buried concealed magmatic bodies are selected as forecast targets to perform high-precision integrated geological,geophysical,and geochemical analysis with the purpose of confirming their specific locations and outlines. The concealed biotite granodiorite body was validated by two boreholes of ZK31901 and ZK40003 below depths 500 m and 960 m,respectively. Moreover,a tungsten bismuth deposit with industrial value was found in the upper level of this concealed magmatic body. In summary,successful finding of hidden rock bodies with drill-verifying in the predicted targets provides a typical example for similar work in adjacent regions,which is also of great significance to research on metallogenic systems,ore genesis and prospecting work in the future.
引文
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