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ZHOU Xiang-ke,WANG Jian-guo,LIU Yin-chun,LI Guang-jing,LEI Heng-yong,MAO Bing.Fluid Inclusion and Sulfur Isotope Study on the Donggualin Gold Deposit in the Ailaoshan Gold Belt[J].Rock and Mineral Analysis,2017,36(4):430-439
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Fluid Inclusion and Sulfur Isotope Study on the Donggualin Gold Deposit in the Ailaoshan Gold Belt
Received:January 06, 2017  Revised:June 10, 2017
DOI:10.15898/j.cnki.11-2131/td.201701060002
Key words: Donggualin gold deposit  fluid inclusion  sulfur isotope  mantle-derived fluid  microthermometry
Author NameAffiliationE-mail
ZHOU Xiang-ke School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
The Geological Museum of China, Beijing 100034, China 
 
WANG Jian-guo School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China wjg@cugb.edu.cn 
LIU Yin-chun China Gold Science and Technology Co. LTD, Beijing 100176, China  
LI Guang-jing China Gold Science and Technology Co. LTD, Beijing 100176, China  
LEI Heng-yong Zhenyuan Company of Yunnan Gold Co. LTD, Zhenyuan 666511, China  
MAO Bing The Geological Museum of China, Beijing 100034, China  
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Abstract:
      Fluid inclusions and sulfur isotopes can reveal the characteristics of ore-forming fluid and the origin of ore-forming materials, which are important indicators for ore genesis. The Donggualin gold deposit is located in the Zhenyuan gold orefield of the Ailaoshan gold belt. Only a few studies have been carried out on this deposit and thus the ore genesis remains unsolved. Microthermometry of fluid inclusion in veins from two mineralization stages and sulfur isotope analyses of pyrite from ores has been studied, in order to unravel the ore genesis. Fluid inclusion results show that the ore-forming fluids belong mainly to the NaCl-H2O system and the homogenization temperatures range from 100℃ to 400℃, with two peak values of 160-190℃ and 280-310℃. The salinities peak at 6%-9% NaCleqv. The densities have two peaks of 0.7-0.8 g/cm3 and 0.9-1.0 g/cm3. These results suggest that the gold-forming fluids are characterized by mid-low temperature and low salinity. The δ34S values of pyrite from the two stages are 0-1‰ and -4.7‰-3‰, respectively, which are generally consistent with those of the lamprophyre wallrock (-0.44‰-0.54‰). The lamprophyre is very close to gold mineralization and lamprophyre-hosted ore is the most common. It can be inferred that the ore materials are probably related to the lamprophyre derived from mantle related to minor crustal contamination. In conclusion, the Donggualin deposit was possibly formed by mantle-derived gold-bearing fluids involved in meteoric water and wall rocks. This research provides an important clue for the ore genesis of the Donggualin gold deposit and gold deposits in the Ailaoshan gold belt.