南海北部缘重力异常的多尺度分析及其构造讨论  

Multi-scale Analysis of Gravity Anomaly and Discussion of Deep Structure in the North Margin of South China Sea

作　　者：武粤[1,2] 孟小红[1,2] 刘国峰[1,2] 

机构地区：[1]地下信息探测技术与仪器教育部重点实验室(中国地质大学,北京),北京100083 [2]中国地质大学地球物理与信息技术学院,北京100083

出　　处：《现代地质》2012年第6期1162-1167,共6页Geoscience

基　　金：国家自然科学基金项目(41074095);国土资源部地质调查工作项目(1212010913037);国家科技部重大专项项目(SinoProbe-01-05)

摘　　要：重力异常是由地下各种密度不均匀体所产生的叠加效果。采用二维小波多尺度方法对南海北部缘重力异常进行分析,解译了重力异常所反映的地下源体,对南海北部缘盆地构造进行认识。通过对南海北部缘重力异常进行分解,结合研究区域地形地貌,对盆地构造和地下岩体分布等地质特征进行分析。结果显示,四阶变换逼近主要由莫霍面起伏引起,小波变换细节主要由沉积基底面的起伏引起。利用小波多尺度对重力异常进行分析具有较好的效果,值得进一步推广研究。The gravity field contains the superimposition effect of heterogeneous bodies with different densities.In order to better analysis the information of the underground source reflected by gravity abnormity and the structure of the north marginal basins in South China Sea,this paper adopted the method of the two-dimensional wavelet decomposition technique.Through resolving the gravity abnormity in the north marginal basins in South China Sea,and combining the topography and geomorphology of the study area,this paper discussed the basin structure and the geological characteristics of rock mass distribution.The results show that the fourth order transform approximation is mainly composed of the information of Moho undulations,and the wavelet transform details is mainly composed of the information of sedimentary-base undulations.It is a better way to use wavelet multi-scale method to analysis the gravity anomaly.

关 键 词：小波变换 多尺度分析 南海北部缘 重力异常 

分 类 号：P631.1[天文地球—地质矿产勘探]