综合地球物理在荒漠覆盖区隐伏矿床预测与定位中的应用:以新疆拉伊克勒克铜多金属矿床为例  

Prediction and location of concealed deposits in desertgobi coverage areas using integrated geophysics:An example of the Layikeleke copper polymetallic deposit in Xinjiang,Northwest China

作　　者：严加永[1,2] 孟贵祥[1,2] 吕庆田 邓震[1,2] 祁光[1,2] 汤贺军 赵金花[1,2] 薛融晖 王栩 YAN JiaYong;MENG GuiXiang;Lü QingTian;DENG Zhen;QI Guang;TANG HeJun;ZHAO JinHua;XUE RongHui;WANG Xu(Chinese Academy of Geological Sciences,Beijing 100037,China;China Deep Exploration Center,China Geological Survey and Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]中国地质科学院,北京100037 [2]中国地质调查局中国地质科学院地球深部探测中心,北京100037

出　　处：《地球物理学报》2021年第11期4117-4133,共17页Chinese Journal of Geophysics

基　　金：国家重点研发计划项目(2018YFC0604002);国家自然基金项目(41574133,92062108);新疆维吾尔自治区地质勘查基金项目(A11-3-XJ4);中国地质调查局地质调查项目(DD20190017,DD20160007)联合资助.

摘　　要：随着人类对资源的需求的增加,传统的矿产勘探空间已经越来越小,必须拓展新的找矿空间,近年来,全球资源能源勘查已经转向大陆深部和覆盖层之下.中国西部广泛分布的荒漠戈壁区,找矿勘查工作程度相对较低,有着巨大的找矿空间,但由于没有露头地表地质观察无法获取成矿信息,地质理论预测的不确定性大幅增加,制约了隐伏矿预测和定位的效果,亟待加强对荒漠覆盖区隐伏矿勘查技术的研究,探索有效的技术方法体系.本文选择准噶尔盆地东缘琼河坝地区为例,开展荒漠戈壁覆盖区找矿预测实践.首先以高精度地面大比例尺重力和磁力资料为基础,采用多尺度边缘检测技术划分断裂构造.然后结合重磁三维反演和多尺度边缘检测技术,开展了隐伏岩体的三维形态识别.在此基础上,结合区域化探和地质资料,预测了7处找矿靶区.对其中的拉伊克勒克靶区进行了大比例尺地球物理和钻探查证,从预查到详查,通过地球物理技术的创新组合,在地表没有矿化线索的荒漠戈壁之下,新发现和评价拉伊克勒克大型铜多金属矿,实现琼河坝地区荒漠戈壁覆盖区找矿突破.结果证明我们提出的荒漠覆盖区隐伏矿预测与定位技术,在类似景观区具有一定的借鉴和示范意义.拉伊克勒克大型铜多金属矿的发现,也说明在新疆、内蒙等戈壁荒漠覆盖区找矿工作大有可为.With the increase of human demand for resources,the traditional mineral exploration space has become smaller and smaller,so new prospecting space must be expanded.Global resource and energy exploration has shifted to deep continents and under overburden areas.Desert gobi areas are widely distributed in western China,which host huge prospecting space.However,because there is no outcrop surface geological observation to obtain metallogenic information,the uncertainty of geology-based theoretical prediction increases greatly,which restricts the effect of concealed ore prediction and location.It is necessary to strengthen the research of concealed ore prospecting technology in desert covered areas and explore an effective technical method system.Taking the Qiongheba area in the eastern margin of East Junggar Basin as an example,this paper presents prospecting and prediction practice in desert gobi covered areas.Based on high-precision ground gravity and magnetic data,multi-scale edge detection technology is used to delineate fault structures.Combined with gravity and magnetic three-dimensional inversion and multi-scale edge detection technology,the three-dimensional shape recognition of concealed rock mass is carried out.On this basis,combined with regional geochemical and geological data,seven prospecting targets are predicted,of which the Layikeleke target area is verified.From the prediction to the detailed investigation,through the innovative combination of geophysical technology,the large-scale copper polymetallic deposit in Layikelekeis is newly discovered and evaluated under the desert Gobi without mineralization clues on the surface,so as to achieve a breakthrough in prospecting for the desert Gobi covered areas in the Qiongheba district.The results show that the prediction and location technology of concealed deposits in desert Gobi covered areas proposed in this work has a certain demonstration significance in similar landscape areas.The discovery of the Layikeleke copper polymetallic deposit also shows tha

关 键 词：荒漠戈壁区 综合地球物理 隐伏矿 预测与定位 拉伊克勒克 

分 类 号：P631[天文地球—地质矿产勘探]