ͨ���Ի������ʯ�����¶ȵļ��㣬��ô��˰��붫����ͬʱ�������ҽ�����Դ�¶ȣ�Ϊ̽�ֻ����ҵ��γ������͹��챳���ṩ��Ҫ��Ϣ�����������������˰������������������ҡ������������I �ͻ�����( �� 300 Ma) ���������A �ͻ�����( 260 �� 290 Ma) ���ڸ��»����ң����ȵIJ�������ɽ����չ���챳�����µ�����Ȧ��ӿ/�Դ�ҽ��ĵ��������й�; �����������I �ͻ����� ( �� 300 Ma) ��٪�޼ͻ��������ڵ��»����ң����ܷ�ӳ��һ�������������븩���йصĹ��챳��; ���Ѽ�I �ͻ����ҵ��ʯ�����¶���٪�޼ͻ����һ�����ͬ�������»����ң����γɿ���������ļ����йأ�����������Թ�̫ƽ�󸩳��Ƭ������; �����Ѽ�A �ͻ����������»����ң����ȵIJ�����������Ѽ�ʱ�ڰ�����չ������������ʯȦ�������µĵ���ҽ������йء�

The original temperatures of different aged granites in eastern Great Xing'an Range have been obtained by the calculation of the zircon saturation temperatures of the granites��which provided important information for discussing the forming condition and tectonic setting of the granites�� The results showed that Early Paleozoic granites��Late Paleozoic I type ( �� 300 Ma) and A type ( 260 �� 290 Ma) granites belonged to high temperature granites��the formation of high heat was related to asthenosphere upwelling or lower intrude action of sourcemantle caused by extensional background after orogenic activity�� Late Paleozoic I type granites ( �� 300 Ma) and Jurassic granites both belonging to low temperature granites��probably show an tectonic setting associated with subduction and fluids participation�� The zircon saturation temperatures of Cretaceous I type granites as the same as the Jurassic's��belonging to low temperature granites��and its formation was probably related to fluids participation�� which maybe came from the relict of ancient Pacific Ocean subductive plate�� Cretaceous A type granites belonging to high temperature granites��and the formation of high heat might be related to the lower intrude action of sourcemantle�� formed by lithosphere reduction in Cretaceous extensional tectonic framework��