[an error occurred while processing this directive] ������� 2011, 30(3) 313-322 DOI:     ISSN: 1004-5589 CN: 22-1111/P

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PubMed
Article by Wang, Z. G. 1
Article by Niu, J. H. 2
Article by Zhu, W. F. 3
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����������������Ϊ3�����ͣ���CO2���ࡢ��Һ����ʹ����ࡣ�����ζȼ�����7.44����8��67��NaCleqv��8.54����8.94��NaCleqv��9.84����10.87��NaCleqv�������䣻�����ܶ�Ϊ0.54��0.88 g/cm3���ɿ��¶���Ҫ������298.4�桫313.5���258.2�桫264.6�档�о������ɿ����ڽ׶�����Ϊ���ζȡ���CO2�ĸ������壬�Ҹ�CO2�ͺ͸���������干�档�ɿ������ڽ׶������ζȺ��¶����Խ��ͣ�CO2��H2O�������ܹ��������ݣ�������ϵ�ɷ��״̬ת��Ϊ�Ͽ���״̬��������ˮ�����ˮ�ȴ����������ҽ����巢����ϣ������������ڽ��������ܽ�ȼ�С��ֱ�ӵ��½�ͽ�������ij���͸������ɿ�ѹ����ΧΪ110��146 MPa���ɿ����Ϊ8.7��10.1 km��ͨ������͵���ɽ�ͽ�������Աȣ��ÿ󴲳�������Ϊ�г���ɽ�ͽ�󣬶���ѧ����Ϊ��һ��٪��������������������ǰ����ײ�ij���������͹�̫ƽ���鸩��ŷ�Ǵ�½�������������Զ��ЧӦ�������õĽ����

�ؼ����� �ɿ����壻�ɿ���ȣ��󴲳��򣻺�����󣻼���ʡ  
Ore-forming fluid characteristics and metallogenic mechanism of Haigou gold deposit in Antu of Jilin
WANG Zhi-Gang-1, NIU Ji-Hui-2, ZHU Wen-Feng-3
1. The First Geological Survey ofJilin Province��Changchun 130033��China�� 2. Institute ofGeological Survey ofJilin Province��Changchun 130061��China�� 3. Shandong Geologic Surveying and Mapping Institute��Jinan 250011��China
Abstract:

The three types of fluid inclusions in Haigou gold deposit include those of the three-phase (gas-liquid-solid) rich in CO2��two-phase (gas-liquid) and pure gas��The salinities of fluid inclusions concentrated in three ranges of 7.44����8.67����8.54����8.94�� and 9.84��-10.87��of NaCleqv��and the densities of fluid inclusions range from 0.54��0.88 g/cm3��The homogenization temperatures of fluid inclusions concentrated in two ranges of 298.4�桫313.5�� and 258.2�桫264.6�森The study shows that��during the early ore-forming stage, the ore-forming fluids are characterized by high temperature��low salinity��coexisting CO2-rich three phase and pure gas phase. In the middle-late ore-forming stage��the ore-forming fluids are characterized by falling in temperature, reducing in salinity��Abrupt falling of temperature results in CO2 and H2O loss��and the fluid system changes into opening system from closed system��The solubility of gold complexes from fluids reduces to cause precipitation of gold and other metal minerals because atmospheric water��interlayer water mixed with magma fluid��The ore-forming pressure is 110��146 MPa��the ore-forming depth is 8.7��10.1 km��Contrasted to other orogenic gold deposits, the Haigou gold deposit is defined as mesozonal orogenic gold deposit. Two kinds of forces, the post-collisional lasting convergent force of North China Plate and Siberia Plate, and the other force from paleo-Pacific Plate subduction to Eurasian continent formed the metallogenic dynamic background of Haigou gold deposit during Early-Middle Jurassic.

Keywords: ore-forming fluid   ore-forming depth   genesis of deposit   Haigou gold deposit   Jilin  
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