衡阳盆地西北缘物化探特征及其找矿意义  

Ore prospecting on northwestern margin of Hengyang Basin using geophysical and geochemical information

作　　者：程云涛 刘俊峰 曹创华 王荡 CHEN Yun-Tao;LIU Jun-Feng;CAO Chuang-Hua;WANG Dang(Hunan Nuclear Industry Geological Survey Institute,Changsha 410011,China;Hunan Institute of Geological Survey,Changsha 410116,China)

机构地区：[1]湖南省核工业地质调查院,湖南长沙410011 [2]湖南省地质调查院,湖南长沙410016

出　　处：《物探与化探》2021年第5期1189-1195,共7页Geophysical and Geochemical Exploration

基　　金：湖南省重点领域研发计划项目(2019SK2261);国家重点研发计划“深地资源勘查开采重点专项”(2017YFC0602402);湖南省核工业地质局科技开发项目(KY2019-DDY-01)。

摘　　要：衡阳盆地是华南扬子板块和华夏板块的拼接带,因其复杂的地质构造运动历史造就了其具有丰富的矿产资源潜力。为深入解剖衡阳盆地西北缘地层构架,探讨矿床就位机制,首先利用跨越紫云山岩体和南岳岩体的多方法长剖面进行综合探测,分析了衡阳盆地西北缘盆地结构;其次选择剖面经过重点区段的精测剖面采用激电测深进行大比例尺精细探测,分析了长寿—衡阳—观音阁断裂的激电响应特征,探讨了其成因与成矿远景;最后结合区域地质、重力异常等综合信息研究了此区内的成矿物质运移规律,证实了衡阳盆地属于典型的"亚幔柱—幔枝体系"。The Hengyang Basin is a junction zone between the Yangtze Plate in South China and the Cathaysian Plate.It is expected to have great potential for rich mineral resources given its complex geological tectonic movement history.This paper aims to deeply analyze and explore the stratigraphic framework and deposit occurrence mechanisms on the northwestern margin of the Hengyang Basin.To this end,a series of geophysical surveys in this area were carried out.Firstly,a multi-method survey of a long section spanning the Ziyunshan and Nanyue rock masses was conducted and the structure of the northwestern margin of the Hengyang Basin was accordingly analyzed.Secondary,large-scale fine detections of subsections in the key sections/blocks were carried out using induced polarization(IP)sounding.Meanwhile,the characteristics of the IP response of the Changshou-Hengyang-Guanyin’ge fault were analyzed especially,and the genesis and metallogenic prospect of the fault were explored.Finally,the migration rules of ore-forming materials on the margin were investigated based on comprehensive information such as regional geological and gravity anomalies.The combined results confirmed that the Hengyang Basin is a typical sub-mantle plume-mantle branch system.

关 键 词：衡阳盆地西北缘 可控源音频大地电磁法 广域电磁测深 综合物化探方法 亚幔柱—幔枝体系 

分 类 号：P631[天文地球—地质矿产勘探]