���õ���̽�롢�����ʴ- - �����ϵ����������ײ��Լ������Գ�嶫�ϲ���ƽȺб���������к���ĸ�ij���Ԫ�ء�΢�� (ϡ��) Ԫ�ؽ����˲��Է������о�����: ��嶫�ϲ���ƽȺб���������еĺ���ĸ����Ԫ���Ը� Fe��Mg Ϊ������Ϊ����þ��ĸ; ����ĸϡ��Ԫ�غ����ͣ�����ϡ�������ǿ��δEu��δCe ��ֵΪ����Ϊѡ�� Ce��Nd ������Ϳ���; ����ĸ�� ��b��Ba��Pb �� Cs �ȴ�������ʯԪ�ظ������ر��� Cs��Ba ���Ը������� Sr ���п���; �߳�ǿԪ�� Zr��Hf��Sc �ȿ��𣬽ϸ�����Ԫ��Ϊ U��Th ��Nb��Ta Ԫ��; ���������Ԫ��Ϊ Cr��Ni��������������Ԫ��Ϊ V��Ti; ����Ԫ�� Cu ����� Zn ���Ը���; ��ɢԪ�� Ga �����Եĸ�����

The major and trace elements for biotites from amphibolites in Jianping Group��located in the southeast of Chifeng City��have been analyzed by electron microprobe and laser ablation inductively coupled plas- ma- mass spectrometry (LA- ICP- MS)�� The study shows that the biotite from amphibolites in Jianping Group char- acterized by enrichment in Fe and Mg��belonging to high iron magnesia mica�� The biotites are low ��EE in content�� with strong fractionation between L��EE and H��EE and positive anomalies of both Eu and Ce��indicating the bio- tites as a Ce + Nd �� rich fraction elemental assemblage mineral�� The biotites exhibit the enrichment of LILE (e. g�� ����b��Ba��Pb��and Cs��especially in Ba and Cs) except Sr��while significantly nagetive HFSE (e. g.��Zr�� Hf and Sc)��and weakly enriched in U��Th��Nb and Ta�� It is also characterized by relatively low siderophile ele- ments Cr��Ni��high V��Ti�� The elements Cu is low��high Zn�� And the dispersed elements Ga is enriched obviously��