大地电磁测深在吉黑东部区域成矿背景研究中的应用  

Application of magnetotelluric sounding in study on regional metallogenic background in eastern Jilin and Heilongjiang

作　　者：时彬[1] 李桐林[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《世界地质》2011年第4期671-676,共6页World Geology

基　　金：中国地质调查局资[2010]矿评01-20-04

摘　　要：大地电磁测深法(MT)在探明深部构造方面已得到广泛应用。运用该方法,将吉黑东部两条大地电磁的剖面进行了数据处理和反演,并与航磁、区域重力资料进行综合分析;结合区域地质资料,对吉黑东部两处矿区的区域构造和成矿背景进行推断解释。剖面结果表明无论是斑岩型还是矽卡岩型矿床,成矿物质都与深部的壳幔岩浆有关;深大断裂是岩浆和含矿热液的运移通道。大规模的白岗岩有利于矽卡岩型矿床的形成。寻找花岗闪长岩与钾长花岗岩之间存在深部构造的区域,有利于圈定斑岩型钼矿的成矿靶区。一撮毛岩体的正南和东南方向的白岗岩与一撮毛岩体具有相似的构造条件,是寻找矽卡岩型成矿靶区值得重视的地区。Magnetotelluric sounding method （MT） has been widely used in the deep structure exploration. Applying this method, the authors do the data processing and inversion of two magnetotelluric sounding profiles in eastern Jilin and Heilongjiang, and analyze the aeromagnetic and regional gravity data comprehensively. Combining with the regional geological data, the authors make an inference to the regional tectonic and mineralization back- ground. The profile result shows that the metallogenic materials of porphyry and skarn-type ore deposits are related with the deep crust and mantle magma, and deep faults are the transport channels of magma and hydrothermal solu- tion. Mass of white granites are conducive to the formation of skarn ore deposits. It is conducive to delineate por- phyry molybdenum mineralization target by finding the deep structure between the granodiorite and K-feldspar gran- ite. The white granite rocks lie in the south and southeast of the tufts rocks have a similar structure condition with the tufts rocks, where is the worthy area to looking for skarn-type mineralization.

关 键 词：大地电磁测深 成矿背景 斑岩型 矽卡岩型 

分 类 号：P631.325[天文地球—地质矿产勘探] P631.2[天文地球—地质学]