Citation: | CHEN Cong, WU Taotao, REN Yunsheng, ZHAO Chunqiang, HAO Yujie, SHANG Qingqing. 2024. Property and source of the ore–forming fluids and genesis of the Sidaogou scheelite deposit in the eastern Yanbian area, Jilin Province[J]. Geology in China, 51(4): 1175-1190. doi: 10.12029/gc20210302002 |
This paper is the result of mineral exploration engineering.
Sidaogou deposit is located in the Au–Cu–W ore concentrated area of the eastern Yanbian, and is a typical quartz vein type scheelite deposit. This paper studied the property and source of the ore–forming fluids and genesis of the deposit, to promote the understanding of the quartz vein type scheelite deposit in NE China and further prospecting.
This paper presents the petrographic observation, microtemperature measurement and Laser Roman spectral analysis of the fluid inclusion, C–H–O isotope analysis and rare earth element compositions for the Sidaogou scheelite–quartz veins.
Petrographic observation indicates that the liquid–rich, daughter minerals–bearing, gas–rich, and CO2–bearing inclusions coexisted in the quartz, and all the types of fluid inclusions have similar homogenization temperatures, which indicate that they belong to boiling fluid inclusions. The lowest homogenization temperature of the gas–rich fluid inclusion (283℃) represents the ore−forming temperature. Laser Raman spectral analysis indicates that the gas phases in the fluid inclusions include H2O and CO2, as well as minor CH4 and N2. Scheelite grains yield “hump” type REE patterns with weak negative δEu anomalies.
The results indicate that the ore–forming fluids of the Sidaogou scheelite deposit are oxidizing NaCl–H2O–CO2±CH4±N2 fluids with high–medium temperature. C–H–O isotopic data indicate that the ore–forming fluids were mainly derived from magmatic water, mixed with a little bit of meteoric water, and the carbonaceous material resulted from oxidation of organic material in the sedimentary rocks from the Wudaogou Group. Therefore, Sidaogou scheelite deposit belongs to mesothermal vein type scheelite deposit, and the fluid boiling induced the precipitation of scheelite.
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Tectonic division of the NE China and tectonic location of the eastern Yanbian area (modified from Wu et al., 2011)
Geological map of the Au–Cu–W ore concentrated area of the eastern Yanbian
Geological map of Sidaogou scheelite deposit
Photographs (a) and micrographs (b, c, d) of the Sidaogou scheelite ores
Micrographs of the fluid inclusions in the Sidaogou scheelite deposit
Histograms of homogenization temperatures (a) and salinity (b) of the fluid inclusions in the Sidaogou scheelite deposit
Spectra of laser Raman microspectroscopic analysis on the gas phase within the single fluid inclusions of the Sidaogou scheelite deposit
Diagrams of
Chondrite–normalized REE patterns of the scheelite in the Sidaogou deposit (normalization values after Sun and McDonough, 1989)
Diagram of homogenization temperatures versus salinity of the fluid inclusions in the Sidaogou scheelite deposit
Sketch map showing the formation of the Sidaogou scheelite deposits in the eastern Yanbian area