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Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/74150

Type: Journal article
Title: XAS evidence for the stability of polytellurides in hydrothermal fluids up to 599ºC, 800 bar
Other Titles: XAS evidence for the stability of polytellurides in hydrothermal fluids up to 599 degrees C, 800 bar
Author: Brugger, Joel
Etschmann, Barbara
Grundler, Pascal Vincent
Liu, Weihua
Testemale, Denis
Pring, Allan
Citation: American Mineralogist, 2012; 97(8):1519-1522
Publisher: Mineralogical Soiety of America
Issue Date: 2012
ISSN: 0003-004X
School/Discipline: School of Earth and Environmental Sciences
Statement of
Responsibility: 
Joël Brugger, Barbara E. Etschmann, Pascal V. Grundler, Weihua Liu, Denis Testemale and Allan Pring
Abstract: Although the crustal abundance of tellurium (Te) is about half of that of gold (Au), several classes of Au deposits are highly enriched in Te. Our understanding of the nature of this Au-Te association is hampered by the lack of experimental studies of Te geochemistry at elevated temperature. We characterized the structure of polytelluride solutions from room temperature to 599ºC at 800 bar using in situ X-ray absorption spectroscopy. Both ab-initio XANES and EXAFS fits show that polytellurides are stable up to the highest temperature with planar structures (four-or threefold coordination of Te) giving way to linear chaines (e.g. Te2-ion) at temperatures above --200ºC. This is the first experimental confirmation of the thermal stability of polytelluride species. The data shows that polytellurides play an important role in Te transport in reduced S-rich or CO2-rich solutions and vapors.
Keywords: Tellurium; polytellurides; aqueous speciation; X-ray absorption spectroscopy; hydrothermal ore deposits
Rights: Copyright © 2012 Mineralogical Society of America. All rights reserved.
RMID: 0020121567
Description (link): http://www.minsocam.org/msa/ammin/toc/2012/AS12.html
Appears in Collections:Earth and Environmental Sciences Publications
View citing articles in: Web of Science

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