�Զ�����ɵؿ鶫�ϲ������򸽽��������ҽ������ʯ U-Pb ����ⶨ��Lu-Hf ͬλ�غ���ʯ����ѧ�о�����������������γ��� 141. 1 ��123. 8 Ma������������ҽ���IJ������ʯӢ������—�����Ҹ߹�ϸ���ƶþ������׼���ʡ��߼ظƼ���ϵ��; �����е�- -���� Eu �쳣 (δEu = 0. 53 ��0. 72)������ϡ������Ƚ����� ��(La/Yb) N =12. 42 ��25. 38�� ; ��Ը�����������ʯԪ�� ��b��Th�� U �� L��EE���߳�ǿԪ�� Ti��Nb��Ta��P �� H��EE ���ֳ���������ʯӢ������—�����Ҿ��и� Sr���� Yb ���� Y ������������Ը� K������ C �Ͱ�����ң��γ��ڼӺ��µؿǵIJ������ڡ�Lu-Hf ͬλ���о���ʾ�� ε Hf (t) Ϊ2. 1 ��6. 2�����׶�ģʽ���� (T DM2 ) Ϊ1 025 ��786 Ma����Ϊ���ҽ�Դ��Ϊ��Ԫ�Ŵ������ĵؿ����ʡ�

The authors studied the zircon U-Pb dating and geochemical characteristics of Lu- Hf isotope��ma- jor��trace and ��EE elements of intrusive adamellite- granite near Xinlin Town��southeastern Erguna terrane block�� The results show the adamellite- granite were formed in Early Cretaceous��ranged from 141. 1 Ma to 123. 8 Ma in age�� The study suggests that adamellite- granite is rich in silicon��alkalis��poor in magnesium��which all belong to quasi- aluminous and high- kalium calc- alkaline series��and display moderate- weak negative europium anomalies (δEu =0. 53 ��0. 72)��showing significant fractionation of H��EE and L��EE ��(La/Yb) N =12. 42 ��25. 38�� ; The adamellite- granite is also characterized by enrichment in ��b��Th��U and L��EE and depletion in Ti��Nb��Ta��P and H��EE�� The adamellite- granite in Xinlin is characterized by enrichment in Sr and K��depletion in Yb and Y�� belonging to C- type adakite�� origrinated from partial melting of thicken lower crusts�� The research on Lu- - Hf isotope shows ε Hf (t) ranging from 2. 1 to 6. 2��T DM2 ranging from 1 025 Ma to 786 Ma��which is considered the adamellite- granite magma origrinated from juvenile crusts during the Neoproterozoic��