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Volume 24 Issue 2
Apr 2013
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Article Contents
Yan Zhao, Qingfei Wang, Xiang Sun, Gongjian Li. Characteristics of Ore-Forming Fluid in the Zhenyuan Gold Orefield, Yunnan Province, China. Journal of Earth Science, 2013, 24(2): 203-211. doi: 10.1007/s12583-013-0323-4
Citation: Yan Zhao, Qingfei Wang, Xiang Sun, Gongjian Li. Characteristics of Ore-Forming Fluid in the Zhenyuan Gold Orefield, Yunnan Province, China. Journal of Earth Science, 2013, 24(2): 203-211. doi: 10.1007/s12583-013-0323-4

Characteristics of Ore-Forming Fluid in the Zhenyuan Gold Orefield, Yunnan Province, China

doi: 10.1007/s12583-013-0323-4
Funds:

the National Key Basic Research Development Program 2009CB421006

the National Key Basic Research Development Program 2009CB421008

the Century Training Program Foundation for the Talents of Humanities and Social Science by the State Education Commission NCET-09-0710

the Program of Introducing Talents of Discipline to Universities of China B07011

More Information
  • Corresponding author: Qingfei Wang, wqf@cugb.edu.cn
  • Received Date: 11 Jan 2012
  • Accepted Date: 25 May 2012
  • Publish Date: 01 Apr 2013
  • 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 H2O and CO2, with low contents of N2, CH4, and C2H6, and the liquids mainly contains Na+, K+, Ca2+, Mg2+, Cl, and SO42−. 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 CO2-dominated FIs. The two generations FIs developed as quartz grew displaying a continuous evolution of the ore-forming fluids.

     

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