Ϊ��ȷ���ĺ������ҵĹ������ԣ���Ұ����ʹ۲�Ļ����ϣ��������ҽ�����ʯѧ�о��͵���ѧ�����������Ҿ��е��͵���״���졢����ߡ��пպ�������̽ṹ����������ӳ���γ��ں����緢��������ѧ������Ʒ���и� TiO₂ ��MgO �͵� Al₂O₃ ��CaO��P₂O₅ ��K₂O ��������������������ʯԪ�� (��b��Sr �� Ba)��΢��Ԫ������ͼ������¡����̬��ϡ��Ԫ���������Ϊ������ (∑L��EE/ ∑H��EEΪ 5. 8 ��6. 5)���� δEu �쳣 (0. 92 ��0. 97)��������Ʒ������������������������΢��Ԫ�ع��컷���б�ͼָʾ����Ʒ�γ����󵺻���ڻ�������Ʒ�����ٶ��ͺ����������������ҵ���ѧ�����Աȣ����ֳ����Ե�������������������������ʯԴ��������ʾ���ҽ����е��������Դ���������ڽ����������Ļ��룬�ҽ�Դ�����ܿ��ѭ����Ӱ�졣�о��������ĺ���״������Ϊ���������������ң��γ�����������׶ε����м���������緢������Ϊ�ĺӵ������ڳ���������ṩֱ��֤�ݡ���������о��ɹ�����Ϊ�ĺӵ��������˹�̫ƽ��������š����м�������ڵ������ӿ����Ǹ��������Լ����ľ˹�ؿ����������Ĺ����ݻ����̡�

Based on field geological investigation��petrological research and geochemical analysis are carried on to confirm the tectonic implication of the ��aohe basalt�� The studies indicate that the basalt has typical character- istics of pillow structure��quenching rim��intermediate hollow skeletal and spinifex textures��revealing that they are formed in the environment of submarine eruption�� The analysis samples show geochemical features of high TiO₂�� MgO and low Al₂O₃ ��CaO��P₂O₅ and K₂O��and are enriched in large ion lithophile elements (��b��Sr and Ba)�� While the trace element spider diagram shows a upward type��and the ��EE diagram shows a right deviation (∑L��EE/∑H��EE is 5.8 ��6.5) without δEu anomaly (0. 92 ��0. 97)��indicating the characteristics of ocean is- land basalts�� Tectonic discrimination diagrams of major and trace element reveal that they are formed in the oceanic island and intra-plate setting�� Compared with the geochemical characteristics of Azores-type and Hawaii-type oceanic island��the samples show the significant characteristics of Hawaii-type ocean island�� The studies of source and petrogenesis suggest the samples derivated from mantle source��added melting metasomatic mantle��and influenced by the circulation between mantle and crust�� The results implied that the ��aohe pillow basalt belongs to Hawaii-type ocean island basalt��and formed in the intra-plate setting of off-axis volcanism during the stage of oceanic crustal consumption��providing direct evidence to the existence of mature ocean basin in the ��aohe area�� Combining with the regional geological research��the authors suggest that the ��aohe area experienced tectonic evolution of the paleo- Pacific plates expansion��mantle plume upwelling in the intra-plate setting of off-axis��oceanic crustal consumption�� obduction-accretion with Jiamusi Massif��