西北地质2025，Vol.58Issue(3)：75-85,11.DOI:10.12401/j.nwg.2024073
音频大地电磁法探测滇中陆良盆地及邻区的地质结构特征
Geological Structure Characteristics of the Luliang Basin and Adjacent Areas in Central Yunnan Detected by Audio Magnetotelluric Method
摘要
Abstract
The Luliang Basin with active tectonics is the largest Cenozoic(Neogene)basin in Yunnan Province.The audio magnetotelluric sounding was effectively used to detect and analyze the underground spatial electrical properties and structural characteristics of the basin and its adjacent areas.Twenty faults(F1-F20)were identified,including the Qujing-Luliang fault belt(F15-F18)that has a great impact on the basin morphology;sev-en concealed faults in the basin section that probably continue active during the Quaternary period;and the main boundary faults at the eastern edge of the basin characterized by significant normal fault movement.The profile shows that its depth is more than 1 000 m,and the depth of the whole basin center is more than 1 600 m.The strata in the basin from surface to deep has been divided into five layers comprised of the Quaternary and the first to the fourth Members of Neogene Ciying Formation(N2c1-4).The structural and morphological characteris-tics of the basin suggest that the Luliang basin is a Cenozoic SW trending dustpan fault basin,with Devonian,Carboniferous and Permian basement.The example shows that audio magnetotelluric sounding is an effective geophysical method for basin exploration.关键词
云南陆良/盆地/音频大地电磁法/电性/断裂Key words
Luliang Yunnan Province/basin/audio-frequency magnetotelluric method/electrical/Fracture分类
地质学引用本文复制引用
黄钊,张小兵,李忠,吴中海,吴清华,杨功,汪金明,黄亮..音频大地电磁法探测滇中陆良盆地及邻区的地质结构特征[J].西北地质,2025,58(3):75-85,11.基金项目
云南省地质勘查基金项目"云南省1:5万马鸣村幅纳章幅越州幅陆良县幅4幅区域地质调查"(D201901),国家自然科学基金资助项目"滇缅接壤区特提斯洋的扩张方式及其时空演化:古-中生代岩浆和沉积作用约束"(92055207),国家自然科学基金云南联合基金项目"金沙江石鼓-攀枝花段活断层作用及其触发巨型滑坡—堵江灾害链时空特征研究"(U2002211)联合资助. （D201901）
