Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/101049
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Type: | Journal article |
Title: | Uranium scavenging during mineral replacement reactions |
Author: | Li, K. Pring, A. Etschmann, B. Macmillan, E. Ngothai, Y. O'Neill, B. Hooker, A. Mosselmans, F. Brugger, J. |
Citation: | American Mineralogist: an international journal of earth and planetary materials, 2015; 100(8-9):1728-1735 |
Publisher: | Mineralogical Society of America |
Issue Date: | 2015 |
ISSN: | 0003-004X 1945-3027 |
Statement of Responsibility: | Kan Li, Allan Pring, Barbara Etschmann, Edeltraud Macmillan, Yung Ngothai, Brian O, Neill, Anthony Hooker, Fred Mosselmans, Joël Brugger |
Abstract: | Interface coupled dissolution-reprecipitation reactions (ICDR) are a common feature of fluid-rock interaction during crustal fluid flow. We tested the hypothesis that ICDR reactions can play a key role in scavenging minor elements by exploring the fate of U during the experimental sulfidation of hematite to chalcopyrite under hydrothermal conditions (220–300 °C). The experiments where U was added, either as solid UO2+x(s) or as a soluble uranyl complex, differed from the U-free experiments in that pyrite precipitated initially, before the onset of chalcopyrite precipitation. In addition, in UO2+x(s)-bearing experiments, enhanced hematite dissolution led to increased porosity and precipitation of pyrite+magnetite within the hematite core, whereas in uranyl nitrate-bearing experiments, abundant pyrite formed initially, before being replaced by chalcopyrite. Uranium scavenging was mainly associated with the early reaction stage (pyrite precipitation), resulting in a thin U-rich line marking the original hematite grain surface. This “line” consists of nanocrystals of UO2+x(s), based on chemical mapping and XANES spectroscopy. This study shows that the presence of minor components can affect the pathway of ICDR reactions. Reactions between U- and Cu-bearing fluids and hematite can explain the Cu-U association prominent in some iron oxide-copper-gold (IOCG) deposits. |
Keywords: | Uranium; scavenging; IOCG deposits; experiment; sulfidation reaction; interface coupled dissolution-reprecipitation reactions |
Rights: | © 2015 Mineralogical Society of America |
DOI: | 10.2138/am-2015-5125 |
Grant ID: | http://purl.org/au-research/grants/arc/DP1095069 |
Published version: | http://dx.doi.org/10.2138/am-2015-5125 |
Appears in Collections: | Aurora harvest 3 Chemical Engineering publications |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.