Fluid inclusions, muscovite Ar-Ar age, and fluorite trace elements at the Baiyanghe volcanic Be-U-Mo deposit, Xinjiang, northwest China: Implication for its genesis

	Fluid inclusions, muscovite Ar-Ar age, and fluorite trace elements at the Baiyanghe volcanic Be-U-Mo deposit, Xinjiang, northwest China: Implication for its genesis
	Xiaofeng Li; Guo Wang; Wei Mao; Chunzeng Wang; Rong Xiao; Mou Wang
	2014
发表期刊	Ore Geology Reviews
卷号	64 期号:1 页码:387-399
摘要	The Baiyanghe Be-U-Mo deposit is located in the Late Paleozoic Xuemisitan-Kulankazi island arc of the northwestern margin of the Junggar plate, Northwest China. It is the largest Be deposit (2.2 M tons of ore with grades ranging from 02% to 1.4%) in Asia. Orebodies in the deposit occur as fractures along contact zones between the Yangzhuang granite porphyry intrusion and Devonian pyroclastic country rocks and within the porphyry itself. Muscovite-fluorite veins are closely associated with the Be-U-Mo mineralization. A new Ar-Ar dating of the muscovite in this study yields a plateau age of 303.0 +/- 1.6 Ma, which constrains the timing of the Be-U-Mo mineralization of the deposit. Three stages of fluorite of different colors have been identified at the deposit, with the earliest dark-purple fluorite more closely associated with the mineralization. Microthermometry of fluid inclusions obtained from the three stages of fluorite suggests that the fluorites were precipitated as veins from low temperature (120-150 degrees C) hydrothermal fluids with salinity ranging from 4.7 to 19.7 wt.% NaCl eqv. Based on the trace elemental concentrations and REE patterns of the fluorite, the style of veining, and the low salinity and low temperature characters of the fluid inclusions, it is suggested that Be and U were most likely transported as fluoride complexes and Mo as hydroxyl complexes. Pb isotopic compositions of the ores and country rocks, as well as O and H isotopic characters of the ore-related muscovite, indicate mixing between magmatic and meteoric waters; both contributed to formation of the ore-forming fluids. Metallic Be, U, and Mo were most likely leached out from the granite porphyry by the fluids. The fluid mixing led to the reduction of U, Mo, and Be and their precipitation at the deposit.
关键词	Be–u–mo Mineralization Fluorite Fluid Inclusions Fluid Mixing Muscovite Ar–ar Dating Pb Isotope Baiyanghe Deposit Northwest China
学科领域	矿床地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5292
专题	矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文矿床地球化学国家重点实验室
推荐引用方式 GB/T 7714	Xiaofeng Li,Guo Wang,Wei Mao,et al. Fluid inclusions, muscovite Ar-Ar age, and fluorite trace elements at the Baiyanghe volcanic Be-U-Mo deposit, Xinjiang, northwest China: Implication for its genesis[J]. Ore Geology Reviews,2014,64(1):387-399.
APA	Xiaofeng Li,Guo Wang,Wei Mao,Chunzeng Wang,Rong Xiao,&Mou Wang.(2014).Fluid inclusions, muscovite Ar-Ar age, and fluorite trace elements at the Baiyanghe volcanic Be-U-Mo deposit, Xinjiang, northwest China: Implication for its genesis.Ore Geology Reviews,64(1),387-399.
MLA	Xiaofeng Li,et al."Fluid inclusions, muscovite Ar-Ar age, and fluorite trace elements at the Baiyanghe volcanic Be-U-Mo deposit, Xinjiang, northwest China: Implication for its genesis".Ore Geology Reviews 64.1(2014):387-399.

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