���ù�һ����֡�Theta map ����ʶ�𷽷��嶨�����˰�����Ѵ����ں�—�������—�׳Ƕ��ѵ�λ�ã���֤�˺ں�—�������—�׳Ƕ��ѵĴ���; ���ǰ���о��ɹ�����ص��ʵ����������Ϸ�����Ϊ�ں�—�������—�׳Ƕ����Ƕ������—�˰��ؿ������۵ؿ�Ĵ�ع���ֽ��ߣ������˰�����Ѵ����ɶ������—�˰��ؿ��ϵĹ��챡��λ�����ܼ�ѹ������ɵؿǹ���䶯�γɵľ�������Ѵ�; ���� Oasis Montaj �شŷ�����������˻�����������֤���������о�������ĵ��ʹ���ģ�͡�

According to the Normalized Differential and the Theta map fracture identification techniques��this article fixes the locations of the Da Hinggan mountains fracture zone and the Heihe - - Qiqihar - - Baicheng fracture�� It verifies the existence of the Heihe - -Qiqihar - -Baicheng fracture�� According to previous research results as well as related geological and geophysical data��we argue that the Heihe- - Qiqihar- - Baicheng fracture is the tectonic bounda- ry of Erguna- - Xing'an plot and Songnen massif�� While the Da Hinggan mountains fracture zone is a giant deep fault which is attributed to crustal tectonic movements squeezed by weak structures of the Erguna - - Xing'an plot�� Utilizing Oasis Montaj gravity and magnetic inversion software for human- computer interaction��we conclude a reasonable ge- ological structure model suitable for the research area��