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| PubMed | |
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Article by Cong, Z. C. |
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Article by Sun, F. Y. |
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Article by Wang, L. |
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Article by Yang, G. B. |
�������λ����Զ—ƽ�ȳɿ���ڣ��ش���������������������������ڳ�¶���ҽ���Ϊ����ĸ���������ҡ�dzɫϸ�������Ҽ��ư�״���������ң������ܶ��ѹ�����ƣ���ʯӢ���ͽ����Ϊ�ĸ���: ʯӢ- - ������Ρ�������- -ʯӢ�Ρ�ʯӢ- -���������μ�̼���νΡ�����������о������������к���ʯӢ�������� CO2 ��������� (����)����Һ��������� (����) �ʹ� CO2 ������ (����) 3 �����͡��ɿ������������ε���Σ��¶ȴ��и��� (301�� �� 365��) ���е��� (200�� ��256��) ���ͣ�CO2 �Ӹ���ƶ���٣������Ͼ��е��ζ� (3. 53% ��10. 74% NaCl eqv ) �͵��ܶ� (0. 55 ��0. 96 g·cm-3 ) ���ص㣬�ɿ�ѹ��Ϊ 75 �� 129 MPa���ɿ����Ϊ 7. 04 ��9. 46 km���ɷ��� CO2 ��H2O Ϊ����δD = ��51 × 10-3 �� ��64. 2 × 10-3 ��δ18O ˮ = 0. 9 × 10-3 �� 7. 1 ×10-3 ��������Ϊ�ɿ������Ե������Ϊ���������д�����ˮ����; δ 34 S �仯��ΧΪ 6. 4 × 10-3 �� 7. 4 ×10-3 ����ʾ�ɿ�����Ϊ��Դ�����ҽ�����ӿ�������븳��Χ�ҷ������ۡ������Դ�������ɿ��������Һ���ͽ��
Jiuqu gold deposit is a quartz vein- altered type gold deposit��located at Zhaoyuan- - Pingdu metallo- genic belt in the northwest of eastern Shandong gold concentration area�� The igneous rocks exposed in the deposit are mainly composed of biotite monzogranites��light fine- grained granites and porphyry- like granodiorites�� Four sta- ges of mineralization were identified��which are quartz- pyrite stage��pyrite- quartz stage��quartz- polymetallic sulfide stage and carbonate stage�� The study of fluid inclusion shows that CO2 - bearing three- phase inclusions (type I)�� gas- liquid two- phase inclusions (type II) and pure CO2 inclusions (type III) developed in quartz of the main min- eralization�� From early to late stage the mineralization fluids demonstrate from low- medium (301�� �� 365��) to medium- high (200�� ��256��) in temperature��and CO2 changes from rich to poor in value��and gnerally have the charactes of low salinity (3. 53% �� 10. 74% NaCleqv) and density (0. 55 �� 0. 96 g·cm-3 )��with metallogenic pressure and depth of 75 ��129 MPa and 7. 04 ��9. 46 km��respectively�� In addition��mineralization fluids have δ18O (0. 9 ×10-3 ��7. 1 ×10-3 ) and δD ( ��51 ×10-3 �� ��64. 2 ×10-3) magma and ore- hosting rock in the up- welling process�� It is suggested that mantle- derived fluids contribute to mineralization�� And the Jiuqu gold deposit should be the mesothermal vein- type gold deposit in genesis��