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Hydrothermal controls on the genesis of REE deposits: Insights from an in situ XAS study of Yb solubility and speciation in high temperature fluids (T<400°C) | |
Marion Louvel; Amélie Bordage; Denis Testemale; Li Zhou; John Mavrogenes | |
2015 | |
发表期刊 | Chemical Geology |
卷号 | 417页码:228-237 |
摘要 | High pressure-high temperature experiments are used to investigate the effect of temperature, pH and fluid composition on the transport and deposition of REE and provide constraints on the role of hydrothermal fluids in the formation of rare metal deposits. In situ X-ray absorption (XAS) measurements were conducted at 50 MPa to determine simultaneously the solubility of Yb compounds (Yb2O3, Yb2Si2O7 and YbPO4) and Yb speciation from 200 to 350–400 °C in fluids involving Cl, F and P ligands. Yb concentrations were monitored down to tens of ppm from the height of the absorption edge while XANES and EXAFS analyses were used to refine the aqueous speciation of Yb in the high temperature fluids. The XAS analysis suggests that Yb solubility is retrograde from 200 °C and that 10 to 100 ppm Yb can be dissolved in acidic fluids (pH < 2) at T < 400 °C, most probably as Yb[(H2O)7,8]3 +species. Increasing pH and adding phosphorus trigger the precipitation of Yb compounds from 200 to 400 °C. Hence buffering of acid orthomagmatic fluids and leaching of P from host rocks could be major mechanisms in the development of (H)REE enrichments in magmatic-hydrothermal systems. |
关键词 | Ree Deposit ytterbium solubility speciation hydrothermal Fluids in Situ X-ray Absorption Spectroscopy |
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/42920512-1/9570 |
专题 | 地球内部物质高温高压实验室 |
作者单位 | 1.Research School of Earth Sciences, Australian National University, Canberra 0200, Australia 2.ICMMO, Université Paris-Sud 11, UMR CNRS 8182, F-91405, Orsay, France 3.Inst. Neel, Universite Grenoble Alpes, UPR CNRS 2940, F-38000, Grenoble, France 4.Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
推荐引用方式 GB/T 7714 | Marion Louvel;Amélie Bordage;Denis Testemale;Li Zhou;John Mavrogenes. Hydrothermal controls on the genesis of REE deposits: Insights from an in situ XAS study of Yb solubility and speciation in high temperature fluids (T<400°C)[J]. Chemical Geology,2015,417:228-237. |
APA | Marion Louvel;Amélie Bordage;Denis Testemale;Li Zhou;John Mavrogenes.(2015).Hydrothermal controls on the genesis of REE deposits: Insights from an in situ XAS study of Yb solubility and speciation in high temperature fluids (T<400°C).Chemical Geology,417,228-237. |
MLA | Marion Louvel;Amélie Bordage;Denis Testemale;Li Zhou;John Mavrogenes."Hydrothermal controls on the genesis of REE deposits: Insights from an in situ XAS study of Yb solubility and speciation in high temperature fluids (T<400°C)".Chemical Geology 417(2015):228-237. |
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