四子王旗大井坡辉长岩地球物理遥感综合信息特征及其相关性  

Geophysical and remote sensing comprehensive information characteristics and its correlation of Dajingpo gabbro pluton in Siziwangqi area, Inner Mongolia

作　　者：朱卫平 熊盛青 刘英会 张婉 李逸川 朱宏伟 徐璐平 张迪硕 ZHU WeiPing;XIONG ShengQing;LIU YingHui;ZHANG Wan;LI YiChuan;ZHU HongWei;XU LuPing;ZHANG DiShuo(Faculty of Earth Sciences,East China University of Technology,Nanchang 330013,China;Key Laboratory of Airborne Geophysics and Remote Sensing Geology,MNR,Beijing 100083,China;China Aero Geophysical Survey and Remote Sensing Center for Natural Resources,Beijing 100083,China)

机构地区：[1]东华理工大学地球科学学院,南昌330013 [2]自然资源部航空地球物理与遥感地质重点实验室,北京100083 [3]中国自然资源航空物探遥感中心,北京100083

出　　处：《地球物理学进展》2023年第4期1898-1911,共14页Progress in Geophysics

基　　金：中国地质调查项目“重点地区航空地球物理调查”(DD20230012);中核联合创新基金项目“粤北下庄铀矿田成矿构造空间研究及找矿预测”(NRE2021-01)联合资助。

摘　　要：为了解浅覆盖区半出露辉长岩等基性岩体地球物理与遥感影像识别方法,本文利用大井坡航空地球物理试验场建设过程中获取的多种地球物理和遥感影像数据,开展了辉长岩岩石磁性、密度、电性、放射性及光谱等综合岩石物性特征,磁、重、电磁、放射性等地球物理场与遥感影像特征以及不同方法组合相关性研究.结果表明大井坡辉长岩具有高磁化率、高密度、中等电阻率、低放射性以及高反射率等综合物性特征,具有近东西向条带状较强磁异常、椭圆形重力高值异常、近椭圆形中等强度电阻率异常、条带状低放射性异常等地球物理场特征和近东西向红色-砖红色条带状、梳状影纹等遥感影像特征;大井坡辉长岩的遥感影像信息、放射性异常信息及地质信息具有很好的相关性,能够比较容易圈定岩体出露地表范围;大井坡辉长岩体磁、重、电磁信息相关性较差,不同方法之间存在信息差异,这种差异是地质体不同属性的反映,与遥感影像、放射性及地质资料对比可圈出隐伏岩体范围.因此,地球物理与遥感影像等多源信息可从不同角度更加全面地表征地质体特征,有助于更加客观地反映地质体属性.多种地球物理及遥感影像、地质等信息显示,大井坡辉长岩体受东西向龙头山断裂控制,总体呈近东西向展布,东西长9~11.5 km,南北宽1.3~2.7 km,与龙头山等岩体构成近直立中基性岩墙.Siziwangqi area is located in central Inner Mongolia in the Bayun'ebo tectonic and magmatic belt on the northern margin of the North China plate,where a large number of intrusive rocks such as granite,gabbro and Mesozoic-Cenozoic volcanic rocks are developed.Dajingpo gabbro pluton in the north of Siziwangqi area is one of the few gabbros exposed in the area.The petrology,geochronology and tectonic setting of Dajingpo gabbro pluton have been studied by predecessors.However,the geophysical and remote sensing image characteristics of the rock mass have not been reported.In order to understand the geophysical and remote sensing image recognition method of semi exposed gabbro and other basic rocks in shallow overburden area.Based on the geophysical and remote sensing image data obtained during the construction of Dajingpo aerogeophysical test site,the comprehensive physical properties of Dajingpingpo gabbro pluton,such as magnetism,density,electricity,radioactivity and spectrum,and the correlation between geophysical fields and remote sensing image characteritics,as well as the combination of different methods.The results showed that Dajingpo gabbro pluton has the comprehensive physical properties such as high magnetic susceptibility,high density,medium resistivity,low radioactivity and high reflectivity.It has geophysical field characteristics such as near east-west banded strong magnetic anomaly,elliptical gravity high anomaly,near elliptical medium intensity resistivity anomaly,banded low radioactivity anomaly and remote sensing image characteristics such as near East-West from red to brick red banded and comb shadow.The remote sensing image information,radioactivity anomaly information and geological information of Dajingpo gabbro pluton have good correlation,which can easily delineate the exposured surface range of the Dajingpo gabbro pluton;The correlation of magnetic,gravity and electrical information of Dajingpo gabbro pluton is poor.There are information differences between different methods,which are the ref

关 键 词：大井坡辉长岩 地球物理信息 遥感影像信息 相关性 内蒙古中部 

分 类 号：P631[天文地球—地质矿产勘探]