大兴安岭南段西坡拜仁达坝-维拉斯托矿床成矿流体特征及其演化

梅微; 吕新彪; 唐然坤; 王祥东; 赵严

doi:10.3799/dqkx.2015.010

Volume 40 Issue 1

Jan. 2015

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Article Navigation > Earth Science > 2015 > 40(1): 145-162

Mei Wei, Lü Xinbiao, Tang Rankun, Wang Xiangdong, Zhao Yan, 2015. Ore-Forming Fluid and Its Evolution of Bairendaba-Weilasituo Deposits in West Slope of Southern Great Xing'an Range. Earth Science, 40(1): 145-162. doi: 10.3799/dqkx.2015.010

Citation:

Mei Wei, Lü Xinbiao, Tang Rankun, Wang Xiangdong, Zhao Yan, 2015. Ore-Forming Fluid and Its Evolution of Bairendaba-Weilasituo Deposits in West Slope of Southern Great Xing'an Range. Earth Science, 40(1): 145-162. doi: 10.3799/dqkx.2015.010

Citation:

Mei Wei, Lü Xinbiao, Tang Rankun, Wang Xiangdong, Zhao Yan, 2015. Ore-Forming Fluid and Its Evolution of Bairendaba-Weilasituo Deposits in West Slope of Southern Great Xing'an Range. Earth Science, 40(1): 145-162. doi: 10.3799/dqkx.2015.010

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Ore-Forming Fluid and Its Evolution of Bairendaba-Weilasituo Deposits in West Slope of Southern Great Xing'an Range

doi: 10.3799/dqkx.2015.010

1.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2014-03-19
Publish Date: 2015-01-15

Abstract

Abstract

The Bairendaba-Weilasituo deposits are the two of the largest hydrothermal vein-type silver deposits at the southern Great Xing'an Range. This paper presents the studies of the fluid inclusions from wolframite, light sphalerite, quartz and fluorite and the sulfur isotope of sulfides. Results show that the homogenization temperatures and salinities decrease gradually from stages Ⅰ to Ⅲ in the Bairendaba deposit. During the mineralization periods of the Weilasituo deposit, fluid of stages Ⅰ and Ⅱ is featured with higher temperature and salinity. The stage Ⅲ has immiscible fluid, which is of medium temperature and salinity (homogenization temperature is 208 to 294 ℃, salinity is 4.65% to 12.39%), and the higher temperature and lower salinity (homogenization temperature is 333 to 406 ℃, salinity is 3.55% to 6.88%) respectively. The fluid of the stage Ⅳ is characterized by lower temperature and salinity. The gas phase compositions of the fluid inclusion show that ore-forming fluids are CO₂-H₂O-NaCl system in the two deposits. In the Bairendaba deposit, the temperature and salinity decreased from stagesⅠ to Ⅲ and H-O isotopes show that the earlier stage fluid is magmatic and the later stage fluid is meteoric water. In the Weilasituo deposit, H-O isotopes and fluid composition (CH₄/C₂H₆ varies from 39.271% to 101.438%), showing that the fluid is magmatic. Sulfur isotopes demonstrate that the sulfur is from the deep source in Bairendaba-Weilasituo deposits. It is concluded that metallogenic mechanism of the Bairendaba deposit is the fluid mixing with different origins, metallogenic mechanism of the Weilasituo deposit is cooling and fluid immiscibility.
- fluid composition,
- ore deposit,
- H-O-S isotope,
- fluid evolution,
- Bairendaba-Weilasituo

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Ore-Forming Fluid and Its Evolution of Bairendaba-Weilasituo Deposits in West Slope of Southern Great Xing'an Range

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