Application of Comprehensive Magnetotelluric Sounding Technique in Prospecting Deep Structures： A Case Study of Nihe Porphyrite Iron Deposit

详细信息   

• 责任者：Kuang Haiyang (College of Nuclear Engineering and Technology ; East China Institute of Technology ; Fuzhou 344000 ; China) ; Lv Qingtian
• 刊名：Acta Geologica Sinica
• 出版年：2012
• 卷期：86(6)
• 关键词：玢岩铁矿床 ; porphyrite iron deposit ; 电磁测深 ; electromagnetic sounding ; 长江中下游成矿带 ; Metallogenic Belt of Middle and Lower Reaches of Yangtze River
• 页码：p.948-960
• 图表：illus., 1 tables, 34 refs.
• 分类号：1001
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

摘要

Middle-Lower Yangtze Valley is an important base of poly-metallic mineral deposits in eastern China.Advanced geophysical survey was employed to prospect the deep structures in typical deposits,and this is of great significance in understanding the genesis of the deep deposits and summarizing exploration methods.In this paper,we chose the Nihe porphyrite iron ore in the Luzong district,Anhui province,as a trial site.Audio magnetotelluric（AMT） sounding,controlled source audio magnetotelluric（CSAMT） sounding and transient electromagnetic（TEM） sounding were carried out.Through the processing and inversion of AMT,CSAMT and TEM data,it is discovered that ore-controlling geological bodies are basically similar in electrical characters but different in some details.The results of three methods,and electrical characters determined distribution of the Zhuanqiao Formation volcanic rock,and identified positions and shape of diorite porphyrite,and inferred the position of ore bodies.Out study suggests that under the condition of processing and reversion of reasonable data,magnetotelluric sounding can distinguish the difference of electrical characters between subvolcanic rock and wall rock to effectively position the interface of ore-controlling structures and thus to infer the positions of ore-bodies.