�ں���������λ�ڴ�С�˰���Ľ�ϲ�������������ҽ��Ƶ������Ҫ��ʯ����Ϊ���ڰ��ҡ����������ҡ�����ѧ������ʾ��Щ��ʯΪ�߼ظƼ���ϵ�е�I �ͻ����ң�������������ʯԪ�� ( LILE) ������߳�ǿԪ��( HFSE) ��LA--ICPMS �ʯU--Pb ����ⶨ������������ڰ��ҵ��γ�ʱ��Ϊ118. 1 ± 1. 5 Ma�����������ҵ��γ�ʱ��Ϊ112. 8 ± 0. 9 Ma����������㷺�ֲ������������ɽ���γ�ʱ��һ�¡�Hf ͬλ�سɷ����������������Դ��Ϊ��—��Ԫ�Ŵ�ʱ���ɿ�������Դ�Ļ���ҡ������ʯѧ���������������������ϣ���Ϊ�ں���������������������ҵ��γ����̫ƽ����ĸ��������йء�

Xinsheng area of Heihe is located in the boundary area of Great Xing'an ��ange and Lesser Xing'an ��ange Mts��where the Early Cretaceous magmatic activity was frequently�� The rocks are mainly composed of granite porphyry and granodiorite��with geochemical characteristics of high-K calc-alkaline I-type granite series��which enrichment in large-ion lithophile elements ( LILE) and depletion in high field strength elements ( HFSE) �� The UPb dating results confirmed by LA-ICPMS indicated that granite porphyry and granodiorite were emplaced at 118. 1 ± 1. 5 Ma and 112. 8 ± 0. 9 Ma��respectively��which were consistented with the stages of volcanic rocks�� Characteristics of zircon Hf isotopic indicated that the source rocks of Early Cretaceous granites were igneous rocks originated from depleted mantle of Mid-Neo Proterozoic�� Combining with their petrography and geological data of adjacent regions�� the authors proposed that Early Cretaceous granites might be closely related to the subduction of paleo-Pacific tectonic plate��