����Դ—ͷ����ƴ�ϴ����϶����������������ֲ��������ҽ�����ϵͳ����ʯѧ������ѧ�о������������ɵ�������ҪΪ���ʻԳ��ҡ�����״��������������Ҽ����ɫԶ������Dz㸻���ʰ��ң������Զμ���ʶϲ�Ӵ��������Ҳ��ֵĵ���ѧ������ʾ���� K �� Al��ǿ������Ԫ�� ��b�� Ba��Th��K��Pb��Hf ��ǿ�Ҹ����͸߳�ǿԪ�� Ta��P �����Կ��� ��� E- - MO��B ����������—����— �������̻�������ʮ�����Ƶĵ���ѧ������Ϊͬ�ڡ�ͬ���챳���IJ����������Դ�����Կ��������Ȧ���������������᣻���γɡ�ͨ�����컷���жϣ���������Ϊ���͵Ĺ����� SSZ �������ҡ�ͨ������Աȴ��˰��뱱��������������ݻ����ָ��˸���ɽ���̲��� Wilson ���أ���Ϊ����������˰�΢�������Դ—ͷ����һ��ƴ�ϣ��պ�ʱ��Ϊ����ϵܽ��ͳ��ɽ�ס�

The author systematically discussed petrology and geochemistry of the ophiolite in the studied area�� It mainly contains metamorphic gabbro��basaltic lava with pillow structure and siliceous slate in bronzing pelagic sedimentary cover from bottom to top�� All the lithologic units are in fault contact�� The geochemistry of the lava ap- pears low K and high Al��and the highly incompatible elements (��b��Ba��Th��K��Pb��Hf) are strong enriched�� with significant losses of high field strength elements (Ta��P)�� The geochemical characteristics of the ophiolite in Xilin��Gaxian��Jifeng��is characterized by E- MO��B��whch is very similar to that of the part igneous rock�� They are the products in the same period and tectonic background��reflecting the source region of the ophiolite derived from asthenospheric mantle and mixed with a small amount of enriched mantle�� Through the construction of environment judgment��it is considered that the ophiolite is in typical transitional SSZ type�� By comparison with the Early Paleo- zoic tectonic evolution in North Greater Khingan ��ange��the Wilson cycle of the orogenic process was recovered�� It is believed that Ergun and Xingan micro plates were pieced together along the Tayuan ��Toudaoqiao��and closing time for the Cambrian series Jiang Shanjie lotus��