广东船肚地区硅化断裂带地电特征分析  

Geoelectrical Characteristics of Main Structures in Chuandu Area of Guangdong

作　　者：陈鹏 谢明宏[1] 邱崇涛[1] Chen Peng;Xie Minghong;Qiu Chongtao(Airborne Survey and Remote Sensing Center of Nuclear Industry,Shijiazhuang Hebei 050002,China)

机构地区：[1]核工业航测遥感中心铀资源勘查技术研究院,河北石家庄050002

出　　处：《工程地球物理学报》2021年第6期944-948,共5页Chinese Journal of Engineering Geophysics

摘　　要：船肚地区铀矿化产于多阶段热液蚀变叠加区,尤其是岩石破碎、蚀变、变质强烈地段以及伴随有碱交代的韧性断裂或其旁侧,因此查明断裂构造的空间展布特征是区内铀矿找矿工作的基础工作。本次通过音频大地电磁测量方法(AMT),获取了区内主要硅化断裂带的地电特征,结合已知地质资料,推断了主要断裂的产状、规模及深部延伸情况。本次研究工作表明,区内硅化断裂带基本呈现为向深部延伸的条带状相对中高阻体,其两侧电阻率明显降低,均反映为明显的低阻区及舌状低阻带,切割深度400~600 m,硅化断裂带两侧的低阻区认为是成矿的有利部位。Uranium metallization of Chuandu area occurs at multi-phase thermally altered stacking zone,especially at zone of rock fracture,alteration and strong metamorphism or sides of ductile fracture with alkali metasomatism.Thus,identifying of distribution characteristics of faults is foundamental for uranium ore prospecting.Through audio magnetotelluric(AMT)survey,the geoelectric characteristics of the main silicified fault zones are obtained.Based on the known geological data,some characteristics as attitude,scale and deep extending of main faults are inferred.The research shows that the silicified fault zones in the region are basically strip-shaped relatively medium-high resistivity bodies extending to the deep,and the resistivity on both sides is obviously lower,which are reflected in obvious low resistivity zones and tongue-shaped low resistivity zones with a cutting depth of 400 m to 600 m.The low resistivity zones on both sides of the silicified fault zones are considered as favorable parts for mineralization.

关 键 词：硅化断裂带 地电特征 船肚地区 音频大地电磁测量 

分 类 号：P631.3[天文地球—地质矿产勘探]