ѡ���Ĵ���֦������Գ��ҺͲ����������ҽ�����ʯѧ����ʯ����ѧ�Ա��о����������������Գ������ڹ����ʸƼ����ң��� Ti; ����������ƫ���ʸƼ����ң��� Mg���� Ti��΢����ϡ��Ԫ�ز�����ԣ�����Գ���ϡ�������ͣ�����Ϊ Eu ���쳣������ϡ������һ��; ������������ϡ�������ߣ�����Ϊ Eu Ԫ����΢�����쳣������ϡ���������ԡ���ԭʼ�����ȣ������Ҳ�����΢��Ԫ�غ����ϸߣ��ر��� ��b��Ba��Th��Nb��La��Ce��Sr ��ǿ������Ԫ�ظ������ 50 �� 100 �������ǰ���о��ɹ���������֦������Գ������̲�����ҿ���Դ�ڸ�����ᣲ�ͬ�̶ȵIJ������ڣ����ں����ݻ������в�ͬ�̶ȵػ�Ⱦ�˿�Դ���ʡ�������Ϊ���ҽ��Ľᾧ�������á���Դ���ʵĻ�Ⱦ�ͻӷ�����ֵı������������������ܹ��γɷ��Ѵ����󴲵���Ҫ�������ء�

Ore- bearing gabbros and ore- free basalts from Panzhihua��Sichuan are compared in this article u- sing lithology and petrogeochemistry methods�� The results show that the ore- bearing gabbros are proved to be pera- luminous calc- alkali rocks��rich in Ti�� However��the ore- free basalts belong to metaluminous calc- alkali rocks�� showing high Mg and low Ti�� The differences in trace elements and rare earth elements are obviously�� The former has low ��EE��a positive anomaly in Eu and common fractionation between light and heavy ��EEs��while the latter appears higher in ��EE��with a weak positive anomaly in Eu and sharp fractionation�� Compared to primitive man- tle��incompatible elements in basalts are higher��especially strong incompatible elements such as ��b��Ba��Th�� Nb��La��Ce��Sr��accumulate 50 ��100 times relatively�� Combined with previous study��it is found that the Pan- zhihua ore- bearing gabbros and Ertan ore- free basalts may be derived from a different extent of partial melting of en- riched mantle��and then are contaminated with crust materials during magma evolution�� The authors propose that crystalization fractionation of magma��contamination with crust materials and retain of volatiles might be the vital controlling factors for gabbro intrusion to form the V- - Ti magnetite deposit��