������ʯѧ������ѧ�������� MC--ICP--MS �ʯ U--Pb ���꣬�Զ��������������������ҽ����˹��컷���о����������������������Ҿ��и߹衢�߼��Ը������� FeOt/MgO �� 104Ga/Al ֵ��������ϡ�������Ե� Eu ���쳣�����ԭʼ������Ը��� Zr��Ga��Y �� Hf �ȸ߳�ǿԪ�ز�ǿ�ҿ��� Ba��Sr��P �� Ti Ԫ�ص�������Ϊ A �ͻ����ҡ��ʯ U --Pb ����� 206Pb/238U ֵ��Ȩƽ������Ϊ416. 9 ±1. 3 Ma�������������־������ɽ����ĩ����ɽ��ײ�����־��־������������ɽ���ؽ�����ɽ����ײ�׶Ρ��ҽ𹵿���������������Ϊ����׼���ʸƼ��Ի����ң����� I �ͻ�����ϡ��Ԫ��������Ϊ I �ͻ����ң��γ�����Ϊ 258. 9 ±2. 1 Ma���������϶��ѽ����������������ʼ�������տ��������������������ص���䷢��ǿ�ҵĿ�᣼������õIJ��

According to the characteristics of petrology��geochemistry and MC--ICP--MS zircon U--Pb dating�� the tectonic setting of granite in Wulonggou of East Kunlun had been studied�� It was shown that the Huanglonggou granite had high content of silicon��alkaline��aluminum��FeOt/MgO��104Ga/Al and L��EE with apparent negative Eu anomalies�� There were obvious enrichment of high field strength elements (Zr��Ga��Y��and Hf) and strong los- ses of Ba��Sr��P��and Ti��comparing with primitive mantle�� These features were consistented with geochemical characteristics of A-type granitoids�� By using LA--ICP--MS zircon U--Pb method��a weighted average age of 416. 9 ±1. 3 Ma (MSWD =3. 6) was obtained��which indicates that the rocks were the post-orogenic collision product in Late Silurian of Early Palezoic��marking the East Kunlun orogenic cycle entering the post-collision stage in that time�� The granodiorite metaluminous calc-alkaline granite of the east Yanjingou mine had the characteristics of the granite type I in rare earth elements��and formed in 258. 9 ±2. 1 Ma��which was the product of intense magmatism resulted by strong crust-mantle shearing between southern Bayan Har terrane and central queensland of South Kun- lun terrane��began in Late Permian��