东北地区重磁场与地壳结构特征

分析了东北地区的重、磁场特征,同时对研究区的布格重力异常和航磁异常据进行了小波分析计算.根据分析与计算可知,东北地区重力场以北东走向为主,表现出该地区重力场的主要趋势.根据磁场的分布特征,可将研究区分为六个区域:呼和浩特以北磁场相对平静区;赤峰一带正负磁场交互变化区;海拉尔以南磁场缓变区;齐齐哈尔—依春磁场剧烈变化区;长春—沈阳负磁场平缓区;牡丹江—丹东磁场区.利用重力资料,应用调和级数法对研究区的莫霍界面进行了反演计算,得到了该地区莫霍界面深度分布.根据磁力资料采用遗传算法反演计算了研究区居里界面的深度分布.同时对研究区的地壳结构特征进行了探讨.

The characteristics of crust structure and the gravity and magnetic fields in northeast region of China

The characters of the gravity and magnetic fields of Northeast of China are analyzed.At the same time the Bouguer gravity anomalies and the aeromagnetic anomalies are calculated by the wavelet analysis method in this paper.With the results of analyzing and processing,the main strike of the gravity anomalies fields is NE.It shows leading features of the gravity field in Northeast of China.According to distribution features of the magnetic field.The research area is divided into six districts: the relatively quiet district in north Hohhot;the interactive changing district of positive and minus magnetic fields around ChiFeng;the slow changing district in South Hailaer;the strong changing district in Qiqihar-YiChun;the quiet district of minus magnetic field in ChangChun-ShenYang;the district in MuDanJiang-DanDong.We apply the Harmonious series method on gravity data to inverse the depth of Moho and use the genetic algorithm method on magnetic data to inverse the depth of Courier surface.Then we make a father research to the characteristics of crust structure with the results of inversion.