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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
Source PublicationChemical Geology
Volume417Pages:228-237
Abstract

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.

KeywordRee Deposit ytterbium solubility speciation hydrothermal Fluids in Situ X-ray Absorption Spectroscopy
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/9570
Collection地球内部物质高温高压实验室
Affiliation1.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
Recommended Citation
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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