现代地质2024，Vol.38Issue(4)：1054-1066,13.DOI:10.19657/j.geoscience.1000-8527.2024.084
滇西南哀牢山构造带李子冲矿区综合物探的应用研究
Application of Comprehensive Geophysical Exploration in the Lizichong Mining Area,Ailaoshan Tectonic Belt,Southwest Yunnan Province
摘要
Abstract
The Lizichong iron-copper deposit is located in the southern section of the Ailaoshan tectonic belt,between the Yangtze Plate and the Indian Plate in Yunnan Province.A large number of iron-copper deposits have been found in the periphery of this area,making it an important iron-copper mineral base in Yunnan Prov-ince.However,this study area is covered by alpine vegetation and has large topographic variations,complex geological structures,intense magmatic activities,making ore exploration challenging.To overcome the limita-tions of a single exploration method,we used high-precision magnetic method,dual-frequency IP methods,and EH4 electromagnetic sounding methods to conduct a comprehensive geophysical exploration in the mining area.Combined with a geological survey,the deep extension of the structure,buried magmatic rock and mineralized body in the mining area were interpreted,and the prospecting information was summarized.Comprehensive geo-physical results show that the mineralized bodies are mainly hosted in the metamorphic rock series in the Ailaos-han Group and are closely related to the basic intrusive rocks and the granodiorite porphyry rock with various types of mineralization.The iron-mineralized area shows high magnetism,low apparent resistivity and high ap-parent amplitude frequency,while the copper-mineralized area is characterized by low magnetism,low apparent resistivity and high apparent amplitude frequency.According to the magnetic anomalies of abrupt or bending de-formation of magnetic field lines,IP anomalies of low apparent resistivity and the measurement and interpretation results of EH4 profiles,there may be earlier-formed NW-trending tensile faults and subsequently-formed NE-trending shear faults.The NW-trending fault is conducive to mineralization,while the NE-trending fault is de-structive to the ore body.In the mining area,the positions with a good combination of IP anomalies and magnet-ic anomalies,and deep ore-forming potential revealed by EH4 electromagnetic sounding have been verified by engineering operations.The results show that the ore body,to some extent,extends into the deep,and that the NW-trending fault and its secondary structure are the main ore-bearing area.There may be new iron-copper mineralization bodies in the deeper locations with relatively low and gentle magnetic anomalies,which have the potential to expand the reserve.This has significance for further geological exploration.关键词
哀牢山变质杂岩带/李子冲铁铜矿/高精度磁法/双频激电法/EH4电磁测深Key words
Ailaoshan metamorphic complex belt/Lizichong iron-copper deposit/high precision magnetic sur-vey/dual frequency induced polarization method/EH4 electromagnetic sounding分类
天文与地球科学引用本文复制引用
于慧敏,沈晓丽,苏虎虎,贾文臣,张宝林,苏捷..滇西南哀牢山构造带李子冲矿区综合物探的应用研究[J].现代地质,2024,38(4):1054-1066,13.基金项目
山东省自然科学基金项目(ZR2023MD023) （ZR2023MD023）
山东省高等教育科技计划项目(J18KA213) （J18KA213）
山东科技大学人才引进科研基金(2017RCJJ029). （2017RCJJ029）
