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2014, 33(3) 591-602 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Characteristics of ore- forming fluid and stable isotope from Jinchanggouliang gold deposit in Inner Mongolia |
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SUN Zhen-Jun, LI Xue-Yuan, XU He-Nan, SUN Guo-Sheng, ZHU Ji-Hao, LU Li-Na, XUE Huai-Yu, SU Rong |
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1. Department of Earthquake Science��Institute of Disaster Prevention��Beijing 101601��China; 2. Inner Mongolia Mining Development Co�� ��Ltd��Huhehaote 010010��China; 3. College of Earth Sciences��Jilin University��Changchun 130061��China; 4. Key Laboratory of Submarine Geosciences��Second Institute of Oceanography��State Oceanic Administration�� Hangzhou 310012��China |
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Abstract��
The authors studied the petrography and microthermometry on fluid inclusions from auriferous quartz in Jinchanggouliang gold deposit��including laser ��aman microspectroscopic and oxygen isotope as well as sulphur isotope analyses��etc�� The results show that the gas phase of ore- forming fluid is mainly composed of H 2 O�� belonging to H 2 O- NaCl system�� The fluid inclusion homogenization temperatures range from 148. 7�� to 352�棬 and the salinities are between 1. 05% ��5. 99%�� The values of δ 18 O vary from ��1. 1‰ to 3. 0‰��which indicates that ore- forming fluid inherits the characteristics of metamorphic fluid��while is still mainly dominated by the mag- matic water and meteoric waters added in later stage�� The δ 34 S V �� CDT ranges 0. 6‰ to 4. 3‰ in composition�� with the mean as 0. 817‰��and range as 3. 1‰��indicating the sulfur in ore- forming fluid mainly came from the mantle source��and secondly from the surrounding rocks�� In sum��the Jinchanggouliang gold deposit is a shallow orogenic gold deposit formed in the extensional environment caused by Pacific Plate's subduction leading to rapid thinning of the lithosphere and delamination in the late Yanshanian period�� |
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Keywords��
fluid inclusion
laser ��aman testing
stable isotope
Jinchangouliang gold deposit
Inner Mon- golia
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