�ɽ��ӽ��λ�ڼ�Ƥ��—�����ɿ���Ķ��϶Σ�����һ���Լ��д����ƣ�������Ҫ������ SN ������С�����ʯ��Ȼ���ͣ��ɽ�һ������Ϊʴ��������ʯӢ���͡���������ҪΪ��Ⱦ״��ϸ��״�����ݿ��ﹲ����ϡ������봩���ϵ���ɽ��ɽ��ӽ��ɿ���̻���Ϊ 3 ���׶�: ������--ʯӢ�׶Ρ����������--ʯӢ�׶μ�ʯӢ--̼���ν׶Ρ��о����������������������ҪΪ��Һ��������弰 CO2��������塣�ɿ������һ�¶ȷ�ΧΪ 138�� �� 355�棬�ζȷ�ΧΪ 2. 23% �� 11. 60% NaCl���ܶȷ�ΧΪ 0. 59 ��0. 99 g/cm3���ɿ�ѹ��Ϊ 64 ��92 MPa���ɿ����Ϊ 6. 45 �� 7. 88 km�����ɿ�׶κ� CO2�������������Һ��������干�棬���������Ͱ�����ľ�һ�¶�������ζȲ��ϴ� CO2/H2O ��ֵ���ͣ������ɿ����巢������ CO2��ʧΪ�����IJ����ܻ���ڣ����������ζ����ߡ��ɿ����������ɷ�Ϊ CO2�� CH4����ʾ���Դ���������ۺ��о��������ɽ��ӽ�󴲳������������г���ɽ�ͽ��

Songjianghe gold deposit��located in the southeast of Jiapigou-Haigou metallogenic belt��was strict- ly controlled by a ductile shear zone and ore-bodies occurred in the SN trending faults�� According to the natural type of ores��the ore can be divided into altered rock type and quartz-vein type�� On the basis of the mineral assem- blage��metasomatic alteration and intercalation��the process of ore-forming can be divided into three phases: py- rite-quartz stage��polymetallic-quartz sulfides stage and quartz-carbonate stage�� Our studying results show that fluid inclusions in quartz can be classified into aqueous two-phase and CO2contain three-phase inclusions mainly�� Hom- ogenization temperatures of ore-forming fluid range from 138�� to 355�棬salinities range from 2. 23% to 11. 60% NaCl��densities range from 0. 59 g/cm3to 0. 99 g/cm3and the ore-forming pressure ranges from 64 to 92 MPa��the ore-forming depth ranges from 6. 45 km to 7. 88 km�� In the main metallogenic stage��aqueous two-phase and CO2-- contain three-phase inclusions coexist��with the close homogenization temperatures��big difference in salinity and decreasing CO2/H2O ratio��which shows the immiscibility or boiling characterized by CO2escaping��and resulted in salinity increasing of the residual fluid�� The gas-phase in fluid inclusions is chiefly made up of CO2and CH4and shows mantle characteristics�� Comprehensive research presents that Songjianghe gold deposit belongs to the mesozo- nal orogenic gold deposit in genetic type��