�����˳������͵����ҽ�������Ҫ�� 4 �ֲ�ͬ����ʯ��Ԫ��ɣ��ֱ�Ϊ�ư�״����ĸ���������ң���ϸ��ʯӢ�����ң�����ϸ���Һͻ���ΰ���ң�ǰ���߷ֲ��㷺��Ϊ�о�������Ҫ��ʯ��Ԫ�������������״���뵽ǰ�����С�Ӧ�� LA- -ICP- -MS �ʯ U- -Pb ���귽��������ư�״����ĸ���������ң���ϸ��ʯӢ�����Ҽ�����ϸ���ҵ�����ֱ�Ϊ 2 496 ± 18 Ma��2 490 ± 19 Ma��2 479 ± 29 Ma���γ��ڹ�Ԫ�Ŵ����ڡ����Ұ�������������λ˳�����絽������Ϊ: �ư�״����ĸ���������ң���ϸ��ʯӢ�����ң�����ϸ���ң�����ΰ���ҡ���ʯ����ѧ������ʾ�������͵����ҽ���������Ԫ�ط���߸߹� (SiO 2 =61. 38% ��74. 99%)������ (Na 2 O + K 2 O = 6. 86% �� 9. 41%)���� Mg # (56 �� 70) ����; A/CNK =0. 91 ��1. 18����׼���� �� ��������ʯ; ΢��Ԫ�ط��棬��Ը�����ϡ��Ԫ�أ�������ϡ��Ԫ�أ����� Eu �쳣 (δEu =0. 50 ��0. 96); ������������ʯԪ�أ�����߳�ǿԪ��; �ʯ Lu- -Hf ͬλ������ ε Hf (t) ֵΪ ��1. 12 �� +6. 13; T DM2 (Hf) ���� 2 594 ��2 937 Ma����ʾ�����ҽ����ҿ���Ϊ������ʼ��������ؿ�����IJ��

Magmatic complex in Xinlitun of Liaoning is mainly composed of four different kinds of rocks��in- cluding biotite monzogranite��medium- fine quartz diorite��granite aplite and granite pegmatite�� The later two pres- ented as fine veins intruding into the former two which are the main rock units and widely distributed�� LA- - ICP- - MS zircons U - - Pb dating yielded three concordant ages of 2 496 ±18 Ma for biotite monzogranite��2 490 ±19 Ma for medium- fine quartz diorite and 2 479 ±29 Ma for granite aplite�� indicating the instrusive time is Early Paleoprotero- zoic�� Combined with their contact relationships in the field��the authors infer that biotite monzogranite intruded firstly��then medium- fine quartz diorite��granite aplite in turn and granite pegmatite at last�� The major elements show that magmatic complex in Xinlitun has high Si (SiO 2 =61. 38% ��74. 99%) ��high Alkali (Na 2 O + K 2 O = 6. 86% ��9. 41%) ��high Mg # (56 ��70) and A/CNK ratios range from 0. 91 to 1. 18��and it belongs to metalu- minous- peralumous rock�� Besides��the ��EE patterns are characterized by the enrichment of L��EEs��depletion of H��EEs and distinct negative Eu anomalies (δEu = 0. 50 �� 0. 96) in chondrite �� normalized ��EE diagram�� The rocks are also enriched in large lithophile elements (LILE)��depleted in high field strength elements (HFSE)�� Combined with the results of zircon Lu- - Hf isotope (ε Hf (t) = ��1. 12 �� ��6. 13��T DM2 (Hf) =2 594 ��2 937 Ma)�� we can draw the conclusion that magmatic complex is the product of mantle material��which are contaminated by ju- venile crust��