��������ͨ�ɶ��뵺�����㷺������λ����׿�ϵ��ͬ��λ�еĻ����� (��) ��ǽ�������ʯ CL ͼ��U- - Pb �������ʯ����ѧ�����о��ó����½��ۡ��ʯ����������: ǰ�����ʯ���������ҽ����õ��ʯ���Ի�ᾧ���׵ı����ʯ���ԣ���ӳ�����������ҽ����������ܵ���½�ǵĻ�Ⱦ; �������ʯ�������- - �����ζ���״�������ҽ������������ṹ�������ṹ����ԭ���ҽ������ʯ���ԣ��ʯ SH��IMP U- - Pb ������ʾ���Ȩƽ������Ϊ 832. 3 ± 8. 1 Ma (n = 14��MSWD = 1. 3)�����Դ�������ҵĽᾧ���䡣��ʯ����ѧ��ɣ�����е� SiO ₂ ��Al ₂ O ₃ ���� TFe ₂ O ₃ ��MgO��TiO ₂ ������������������������������; ��ϡ��Ԫ��������Խϵ� (Σ��EE = 71. 88 × 10 ^��6 �� 129. 64 × 10 ^��6 )���Ҿ������� Eu �쳣�������; �Ը�����ϡ��Ԫ�� (L��EE)��������������ʯԪ�� (LILE: ��b��Pb��Ba) �͸߳�ǿԪ�� (HFSE: Th��U��Zr��Ti��Hf)��������߳�ǿԪ�� (HFSE: Nb��Sm��Gd��P) ��; ��������ָʾ�ҽ�Դ��Ϊ�����͵�ᣣ�������λ��λ��������½�Dz�ͬ�̶ȵ�ͬ����Ⱦ�����ĶԻ����ҵ��о���ʾ��������ͨ�ɶ��뵺��������Ԫ�Ŵ����ڴ��ڻ����ҽ�������ǰ�˶Ի�������ͨ��Ԫ�Ŵ�����—��Ԫ�Ŵ����ڹ���- - �ҽ��¼����о��ɹ�����һ��֤���˻�������ͨ����������Ԫ�Ŵ����ھ����˼�ѹ��ۺ����չ�ѽ��ݻ����̣����� ��odinia ����½�ۺϺ��ѽ��¼�һ�¡�

The diabase dike develops extensively in Liaodong Peninsula��North China Craton ( NCC)�� which emplaces in different layers of Qingbaikou System�� The following conclusions are drawn from the zircon CL image��SH��IMP U- -Pb dating and the geochemical characteristics�� The zircon types can be divided into three groups��two groups with the attributes of early magmatic zircon or metamorphic zircon in crystalline basement�� impl- ying that they experienced contamination by the crust during the emplacement process of diabase magma��and the third group with euhedral- subhedral short column in sharpe��displaying oscillatory growth zoning rims or striped ab- sorption��indicating that the zircons are of igneous origin�� The weighted mean age from the third type of zircon by SH��IMP U - - Pb zircon dating is 832. 3 ±8. 1 Ma (n =14��MSWD =1. 3)��which can represent the crystallization age of diabase�� Geochemically��the diabase has relatively low contents of SiO ₂ and Al ₂ O ₃ ��high contents of TFe ₂ O ₃ ��MgO and TiO ₂ ��which is similar to those of tholeiite�� And they have low total ��EE content (Σ��EE = 71. 88 ×10 ^��6 ��129. 64 × 10 ^��6 )��with slight Eu anomaly and Nb * loss��and are relatively enriched in light rare earths (L��EE)��large in lithophile elements (LILE: ��b��Pb��Ba) and high field strength elements (HFSE: Th��U��Zr��Ti��Hf)��but relatively depleted in high field strength elements (HFSE: Nb��Sm��Gd��P)�� Above characteristics indicate that the magma source is close to that of enriched mantle��and the magma experi- enced assimilation and contamination by the continental crustal materials of different degrees during the emplace- ment process�� Combined with previous data on Late Mesoproterozoic- -Early Neoproterozoic tectono- magmatism in the north margin of NCC��the diabase research in this paper confirms the existence of the Early Neoproterozoic bas- ic magmatism in Liaodong Peninsula��and further evidences the northeastern NCC experienced in extensional break- ing processes in Early Neoproterozoic after the compression convergencing��which coincides with the assembly and breaking event of ��odinia supercontinent��