�����ͭ�����ܶ��ѹ�����������������Ͽ��Ƶ��Խ�ͭΪ���Ķ�����󴲡������ڶԸ������ʵ���Ļ����ϣ����ú�����׷�������΢���¼����Գɿ���������о������ָ���Χ��ʴ���Ծ���ĸ���������һ���Ϊ�ձ飬�����ɿ�׶η�Ϊ4 ���׶�: ������Ӣ�ҽ׶Ρ�ʯӢ--������׶Ρ����������׶κ�ʯӢ--̼���ν׶�; ��Ӧ�ľ�һ�¶�Ϊ320�� �� 360�桢280�� �� 320�桢200�� �� 280���200�� �� 240��; �������ɿ�׶�Ϊ�ڶ������׶Σ����ɿ��¶�Ϊ200�� �� 320�棬��Ҳ����Һ��ˮ�Ͷ�����̼������ߵĽ׶Ρ������ζ�Ϊ1. 91 �� 13. 40 ( wt%��NaCl) ���ܶ�Ϊ0. 69 �� 0. 95 g /cm3���ߵ��ζȺ͵��ܶȵ��ص�; �ɿ����Ϊ0. 8 �� 1. 5 km����dz��ɿ���ص�; ����ͬλ�ط����� δ18OH2O��ֵΪ�� 4. 7 × 10 �� 3 �� 5. 83 × 10 �� 3��δDH2O��ֵΪ�� 89 × 10 �� 3 �� �� 124 × 10 �� 3��˵���ɿ�������ҪΪ�ҽ�ˮ������������ˮ���ۺ��о������������ͭ������dz�������ҽ���Һ�Ϳ󴲡�

Miantian gold-copper deposit is a gold-copper-based multi-metal deposit controlled by faults and neutral intrusions�� On the basis of geological survey��we studied the ore-forming fluids by infrared spectroscopy and micro themometry�� The results showed that the wall rock alteration was dominated by sericitization and propylitization�� and the mineralization consisted of four stages��including the beresite stage��quartz-pyrite stage��polymetallic sulfides stage and quartz-carbonate stage��Correspondingly the homogenization temperatures were 320�� �� 360�棬 280�� �� 320�棬200�� �� 280�� and 200�� �� 240�棬in which the second and third were the main mineralization stages��corresponding homogenization temperatures from 200�� to 320��) �� At the same time there were the highestcontents of H2O and CO2 in the main mineralization stages�� Salinity of fluid varied between 1. 91% and 13. 40% ( wt%��Nacl) and density was 0. 69 �� 0. 95 g /cm3��with obvious characteristics of low salinity and density�� The main ore-forming depth was from 0. 8 km to 1. 5 km��which indicated the epizonal characteristics�� Based on the compositional analytical results of fluid inclusions��the values of δ18OH2O and δDH2O were �� 4. 7 × 10 �� 3 �� 5. 83 × 10 �� 3 and �� 89 × 10 �� 3 �� �� 124 × 10 �� 3��which illustrated that the ore-forming fluids mainly originated from magmatic hydrothermal along with a small amount of atmospheric water�� Miantian gold-copper deposit belonged to medium temperature epizonal magmatic-hydrothermal deposit��