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Open AccessArticle

Fluid Evolution, H-O Isotope and Re-Os Age of Molybdenite from the Baiyinhan Tungsten Deposit in the Eastern Central Asian Orogenic Belt, NE China, and Its Geological Significance

1
Faculty of Geosciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
2
Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3
Innovation Academy of Earth Sciences, Chinese Academy of Sciences, Beijing 100029, China
4
University of Chinese Academy of Sciences, Beijing 100049, China
5
264 Brigade of the Jiangxi Nuclear Industry Geological Bureau, Ganzhou 341000, China
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(8), 664; https://doi.org/10.3390/min10080664
Received: 28 June 2020 / Revised: 19 July 2020 / Accepted: 23 July 2020 / Published: 26 July 2020
The quartz-vein-type Baiyinhan tungsten deposit is located at the eastern part of the Central Asian Orogenic Belt, NE China. Analyses of fluid inclusions, H-O isotope of quartz and Re-Os isotope of molybdenite were carried out. Three stages of mineralization were identified: The early quartz + wolframite + bismuth stage, the middle quartz + molybdenite stage and the late calcite + fluorite stage. Quartz veins formed in the three stages were selected for the fluid inclusion analysis. The petrographic observation and fluid inclusion microthermometry results revealed three types of fluid inclusions: CO2-H2O (C-type), liquid-rich (L-type) and vapor-rich (V-type). The homogenization temperatures of C-type, V-type and L-type inclusions were 233–374 °C, 210–312 °C, and 196–311 °C, respectively. The salinity of the three types of inclusions was identical, varying in the range of 5–12 wt%. The H-O isotope analyses results showed that quartz had δ18OH2O and δDSMOW compositions of −2.6‰ to 4.3‰ and −97‰ to −82‰, respectively, indicating that the ore-forming fluids were mainly derived from magmatic water with a minor contribution of meteoric water. The addition of meteoric water reduces the temperature and salinity of the ore-forming fluids, which leads to a decrease of the solubility of tungsten and molybdenum in the fluids and eventually the precipitation of minerals. Re-Os isotopic analysis of five molybdenite samples yielded an isochron age of 139.6 ± 7.6 Ma (2σ) with an initial 187Os of −0.05 ± 0.57 (MSWD = 3.5). Rhenium concentrations of the molybdenite samples were between 3.1 ug/g and 8.5 ug/g. The results suggest that the metals of the Baiyinhan deposit have a crust origin, and the mineralization is one episode of the Early Cretaceous tungsten mineralization epoch which occurred at the eastern part of the Central Asian Orogenic Belt. View Full-Text
Keywords: Re-Os dating; fluid inclusions; H-O isotope; quartz-vein tungsten deposit; eastern Central Asian Orogenic Belt Re-Os dating; fluid inclusions; H-O isotope; quartz-vein tungsten deposit; eastern Central Asian Orogenic Belt
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MDPI and ACS Style

Wang, R.; Zeng, Q.; Zhang, Z.; Guo, Y.; Lu, J. Fluid Evolution, H-O Isotope and Re-Os Age of Molybdenite from the Baiyinhan Tungsten Deposit in the Eastern Central Asian Orogenic Belt, NE China, and Its Geological Significance. Minerals 2020, 10, 664. https://doi.org/10.3390/min10080664

AMA Style

Wang R, Zeng Q, Zhang Z, Guo Y, Lu J. Fluid Evolution, H-O Isotope and Re-Os Age of Molybdenite from the Baiyinhan Tungsten Deposit in the Eastern Central Asian Orogenic Belt, NE China, and Its Geological Significance. Minerals. 2020; 10(8):664. https://doi.org/10.3390/min10080664

Chicago/Turabian Style

Wang, Ruiliang; Zeng, Qingdong; Zhang, Zhaochong; Guo, Yunpeng; Lu, Jinhang. 2020. "Fluid Evolution, H-O Isotope and Re-Os Age of Molybdenite from the Baiyinhan Tungsten Deposit in the Eastern Central Asian Orogenic Belt, NE China, and Its Geological Significance" Minerals 10, no. 8: 664. https://doi.org/10.3390/min10080664

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