���õ��ʡ���̽����̽�ҿ󷽷�����Į��Ԫ��ɽ�������ۺ��о������������Ŀǰ�ѷ��ֿ��� 4 �������� 3 ����Au ƽ��Ʒλ 2. 15 ×10 ��6 ; ����ز�Ϊ٪��ϵ��ͳĮ����; �ؿ���Ϊ NEE ��Į���Ƹ����졣�ų�ǿ�� ΔT ֵһ���� �� 30 �� 20 nT��ΔΤ ���ֵΪ 133. 1 nT; �Ӽ��������ֵΪ 23. 58%��ƽ��ֵΪ 10. 58%; �ӵ�����һ����500 Ω·m ���£����Ϊ1 200 Ω·m����ʾ��̽�쳣�ߵ��衢�߼���������Į����ز��Ԫ�ط��ֵΪ 8. 06 × 10 ^��9 ����׼���Ϊ 0. 25���仯ϵ��Ϊ 0. 912�������� δ 34 S ֵΪ 3. 3 ×10 ^��3 ��5. 3 ×10 ^��3 ������Ϊ 2. 5 ×10 ^��3 ��ƽ��ֵΪ 4. 5 × 10 ^��3 �������ҽ����ص�; ʯӢ������������ δ 18 O ֵΪ 5. 2 × 10 ^��3 �� 9. 6 × 10 ^��3 ��δD ֵΪ �� 125 × 10 ^��3 �� �� 112 × 10 ^��3 ��δ 18 O �� δD �仯��Χ�ϴ󣬷�ӳ�ڳɿ�������д�����ˮ���롣���ݵ��ʺ��ﻯ̽�쳣�������ۺ���Ϣ����Ϊ��������С�� (HS- - 8 ˮϵ����쳣) �����õ��ҿ�ǰ����

Comprehensive research was carried on the gold ore in Yuanbaoshan by geological��geophysical and geochemical exploration methods�� The results show that four ore bodies and three mineralized bodies have been found with an average Au grade of 2. 15 × 10 ^��6 �� The ore- hosting strata are the Middle Jurassic Mohe Formation�� The ore- controlling structure is nappe structure of Mohe with NEE direction�� The magnetic field strength ΔT usually is ��30 ��20 nT��while with 133. 1 nT in maximum�� The apparent polarization is 23. 58% in maximum and its av- erage is 10. 58%�� The apparent resistivity is usually below 500 Ω·m��and the highest is 1 200 Ω·m��which shows the abnormal geophysical exploration feature by low resistance and high polarization�� The gold abundance in Mohe Formation is 8. 06 ×10 ��9 ��the standard deviation is 0. 25��and the coefficient of variation is 0. 912�� The val- ue of pyrite δ 34 S is 3. 3 ×10 ^��3 ��5.3 ×10 ^��3 ��the range is 2. 5 ×10 ^��3 ��and the average is 4. 5 ×10 ^��3 ��which indi- cates the characteristics of magmatic sulfur�� The value of δ 18 O of fluid inclusion in quartz is 5. 2 × 10 ^��3 �� 9. 6 × 10 ^��3 ��the value of δD is ��125 ×10 ^��3 �� ��112 ×10 ^��3 ��and the variation range of δ 18 O and δD is comparatively big��which shows atmospheric precipitation was in the process of mineralization�� According to the abnormal features of geological and geophysical exploration��we believe that there is good prospect for explovation in Xiaojingou in western ore district (HS- - 8 combination anomaly of stream) .