渝东南地区隐伏铝土矿物探勘查技术试验研究——以车盘矿区试验结果为例  

Examination Study of Geophysical Methods in Exploring Buried Bauxite Deposit in Southeast of Chongqing City: an Example from the Chepan Mining Area

作　　者：李华[1] 艾斯卡尔[1] 吾守艾力[1] 李富[1] 焦彦杰[1] 王桥[1] 周一敏[1] 

机构地区：[1]中国地质调查局成都地质调查中心,成都610081

出　　处：《地质学报》2013年第3期384-392,共9页Acta Geologica Sinica

基　　金：中国地质调查局项目(编号1212010633901)资助成果

摘　　要：全国矿产资源潜力评价研究表明渝东南地区有着丰富的铝土矿资源,在此开展隐伏铝土矿的物探勘查技术试验研究对今后勘查工作的展开具有重要的指导意义。在充分了解渝东南地区铝土矿的成矿规律及矿体特征的基础上,总结了该地区铝土矿的储存模式;然后根据其成矿规律和储存模式,结合前人的经验及区域物性差异,提出了使用电磁测深法来确定该区唯一含矿层位——梁山组地层的空间分布形态,以达到间接寻找隐伏铝土矿的方案。选取重庆武隆车盘矿区作为试验场地,在同一剖面上同时展开了可控源(人工场源)音频大地电磁测深法(CSAMT)和高频大地电磁测深法(EH4)两种方法的试验工作,介绍了数据采集及数据质量评价等,对两种电磁测深数据分别进行了人机交互的二维连续介质反演,并结合钻孔资料对两个反演的频率-视电阻率剖面进行了对比分析,最后结合区域地质构造背景勾画出物探成果推断图。National mineral resources potential evaluation shows an abundant bauxite resource in southeast of Chongqing city. Therefore, it will be of great guiding significance to conduct geophysical exploration in this area. Based on fully understanding of metallogenic law and orebody characteristics in this area, this study sums up the preservation mode of bauxite, and then determines the spatial distribution of ore-bearing Liangshan Formation in order to find buried bauxite through electromagnetic sounding method. The Chepan mining area was selected to conduct two experiments in the same profile, controllable source （person workshop source） audio magnetotelluric sounding method （CSAMT） and high-frequency magnetotelluric sounding method （EH4）. The data acquisition and data quality evaluation are introduced. Two kinds of electromagnetic sounding data were inversed by the two-dimensional continuum inversion of the human-computer interaction. Combined comparison analysis between borehole data and two inversed profiles of frequency-apparent resistivity, an inferred diagram of geophysical results has been outlined.

关 键 词：渝东南地区 车盘矿区 铝土矿 EH4 CSAMT 反演 

分 类 号：P618.45[天文地球—矿床学]