��⬹������й������������͵ĵ�����dz�ɵ�����Һ�ͽ��Ϊȷ���ÿ󴲵ijɿ�����ѧ�������γ���ȣ��Բ�ͬ��ߵ�ͬһ������ʯӢ���е���������忪չ����΢���ºͼ����������׷������������������ʯӢ--����ʯ���е�ʯӢ�뷽��ʯ��Ҫ������Һ���༰������Һ������壬�������һ�¶ȱ仯��ΧΪ112. 2 �� �� 377. 7 �棬������200 �� �� 240 �棬�ζ�( w ( NaCl) ) Ϊ0. 18% �� 10. 87%��ƽ��ֵΪ3. 43%���ɿ������ܶ�Ϊ0. 57 g /cm3 �� 1. 00 g /cm3��ƽ��ֵΪ0. 89 g /cm3����ϰ�����������ֵļ����������׷�����Ϊ���ɿ����������¡����ζȡ����ܶȵ�NaCl --H2O ( --CO2 ) ��ϵ�����ݰ�������½����������ÿ󴲵ijɿ�ѹ��Ϊ7. 99 �� 37. 89 MPa��ƽ��ֵΪ14. 92 MPa����Ӧ�ijɿ����Ϊ0. 27 �� 1. 26 km��ƽ��ֵΪ0. 50 km���������ͬ��󴲵ĶԱ��о��������ÿ󴲰�ʴ��Ƚ�С����Ծ���һ�����ҿ�Զ����

The Ciweigou gold deposit is one of typical low-sulphidation epithermal gold deposits in NE China�� In order to determine its physical and chemical conditions and ore-forming depth��the microthermometric and laser raman spectrum analysis of fluid inclusions in the quartz and calcite from the same auriferous quartz-calcite vein in different levels are carried out�� There are major gas-liquid two-phase and small amount of liquid phase fluid inclusions in auriferous quartz-calcite vein�� The homogenization temperature of the two-phase inclusions ranges from 112. 2 �� to 377. 7 �� and mainly from 200 �� to 240 ��; the salinity ranges from 0. 18%NaCl to 10. 87%NaCl�� and the average value is 3. 43%NaCl; the density changes from 0. 57g /cm3 to 1. 00 g /cm3 and the average is 0. 89 g /cm3 �� Together with the Raman spectra of gas phase in fluid inclusions��characteristics of the fluid inclusions show that the ore-forming fluid belongs to NaCl-H2O ( CO2 ) hydrothermal system with low temperature��salinity and density�� According to the microthermometric data��the value of ore-forming pressure can be estimated from 7. 99 to 37. 89 MPa and the mean value is 14. 92 MPa�� The depth of the mineralization is from 0. 27 to 1. 26 km��averaging 0. 50 km�� Based on the comparision between the Ciweigou deposit with other epithermal gold deposits��it can be concluded that the small denudation depth of the Ciweigou deposit demonstrates the preferable ore prospecting in this deposits��