���������������쳣���ݼ��䴦����( ˮƽ�ݶ�ģ��б����) ���Զػ���ر߽硢�������������λ�ü��Ի����Ϊ����Ĵ�����ֲ��������о�����������쳣�ķ�����ˮƽ�ݶ�ģ��б�����ļ�������������ػ��׾��ϲ����ݡ�����͹��ͱ������ݵ�“����һ͹”�������̬����������ڶ�����SW--NE ��Ϊ�������Ϊ���ϰ��ǵʽ��ء����ݺ����쳣������ػ���Ϊ4 ���쳣��: ���������쳣�����в��ʹ��쳣�������ϸߴ��쳣�������ϱ߲���Եʹ��쳣������ϴ��쳣ˮƽ�ݶ�ģ��б�����ļ�������ʾ���Ի����Ϊ����Ĵ�������SW--NE ������ơ�

Based on the data of gravity and magnetic anomalies and their processing results ( horizontal gradient modules and tilt derivatives) ��the authors study the boundary��basement relief and faults location of Dunhua Basin��and the distribution of magnetic bodies characterized by igneous rocks�� The results of gravity anomaly��horizontal gradient modules and tilt derivatives reveal that the basin basement possesses two depressions ( south and north) and one salient ( center) in morphological characteristics; while the main faults distribute along with southwest- northwest ( SW--NE) direction��and the basin presents a graben basin with a single boundary fault�� The basin can be divided into four anomalous regions based on magnetic anomaly: the northeastern magnetic anomalous region�� the central low magnetic anomalous region��southwastern high magnetic and relative low magnetic anomalous region�� By analyzing the tilt derivatives and horizontal gradient modules of magnetic anomaly��it is shown that the distribution of the igneous rocks are controlled by SW--NE structure��