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2015, 34(4) 951-960 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Evolution characteristics of fluid and genesis of Qinglonggou gold deposit in Qinghai |
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WEI Zhan-Hao, DU Sheng-Peng, WANG Jian, ZHANG Yan-Jun, ZHANG Yu-Ting, CHEN Chang-Xin, BAI Yi-Na |
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1. The First Exploration Institute of Geology and Mineral ��esources in Qinghai Province��Haidong 810600��Qinghai��China; 2. College of Earth Sciences��Jilin University��Changchun 130061��China |
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Abstract��
Qinglonggou gold deposit is located in the northern margin of Qaidam Basin and sourthern Qilian o- rogenic belt�� The deposit is controlled by northwest trending layer slip fault of Qinglonggou anticline fold and be- longs to altered rock type of ore�� According to mineral combination and interspersed relationship��the mineraliza- tion process could be divided into three stages: non- ore quartz veins stage (stage ��)��quartz -pyrite sulphides stage (stage ��) and quartz carbonate stage (stage��)�� Petrographic and microthermometric study of fluid inclu- sions indicate that the fluid inclusions of different stages in quartz are mainly gas- liquid two- phase inclusions��and appear pure liquid in the quartz carbonate stage�� The homogenization temperatures are successively concentrated in 200�� ��240�棬 170�� ��210�� and 130�� ��160�棬correspondingly ore- forming pressure are 24. 39 MPa��17. 30 MPa and 11. 84 MPa while ore- forming depth are 2. 4 km�� 1. 7 km and 1. 2 km during the mineralization stages �� �� On the basis of fluid features and the geological characteristics��the Qinglonggou gold deposit is defined as an epizonal orogenic in genetic type�� |
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Keywords��
fluid inclusion
orogenic gold deposit
Qinglonggou
Qinghai
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Received Revised Online: |
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