Characteristics of Ore-Forming Fluid in the Zhenyuan Gold Orefield, Yunnan Province, China
查看参考文献29篇
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文摘
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The Zhenyuan (镇沅) gold orefield is located in the Ailaoshan (哀牢山) gold belt, Sanjiang (三江) metallogenic region, China. The fluid inclusions (FIs) in mineralized quartz samples, collected from four deposits, i.e., Laowangzhai (老王寨), Donggualin (冬瓜林), Kudumu (库独木), and Daqiaoqing (搭桥箐), in the orefield, were studied to reveal ore-forming process. Only aqueous-type and H2O-NaCl-type FIs were observed in the samples. Two generations of FIs are identified due to the spatial occurrences of FIs in host minerals. The early generation is located in the internal zone of quartz crystal, and it has higher homogenization temperatures varying from 180 to 255 ℃ and salinities ranging from 8.7% to 11%; the late generation, often with beating bubbles under room temperature, is developed in the quartz margin, its homogenization temperatures is lower within 95 to 160 ℃. After elimination of the late generation of FIs, early generation FIs compositions were tested. Gaseous phases in the FIs were H_2O and CO_2, with low contents of N_2, CH_4, and C_2H_6, and the liquids mainly contains N_a~+, K~+, Ca~(2+), Mg~(2+), Cl~-, and SO_4~(2-). The reappraisal of the previously published hydrogen and oxygen isotope results suggested that the early generation of ore-forming fluid was mainly primary magma hydrothermal, while the late generation fluid contains large amounts of meteoric water. Thus, the result showed that Zhenyuan gold orefield may differ from typical orogenic deposits, which contains abundant CO_2-dominated FIs. The two generations FIs developed as quartz grew displaying a continuous evolution of the ore-forming fluids. |
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来源
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Journal of Earth Science
,2013,24(2):203-211 【核心库】
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DOI
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10.1007/s12583-013-0323-4
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关键词
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fluid inclusion (FI)
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ore-forming fluid
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Ailaoshan orogenic belt
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Zhenyuan gold orefield
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地址
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China University of Geosciences (Beijing), State Key Laboratory of Geological Processes and Mineral Resources, Beijing, 100083
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1674-487X |
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基金
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supported by the National Key Basic Research Development Program
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the Century Training Program Foundation for the Talents of Humanities and Social Science by the State Education Commission
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国家教育部高等学校学科创新引智计划项目
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文献收藏号
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CSCD:4793505
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