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https://hdl.handle.net/2440/101049
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dc.contributor.author | Li, K. | - |
dc.contributor.author | Pring, A. | - |
dc.contributor.author | Etschmann, B. | - |
dc.contributor.author | Macmillan, E. | - |
dc.contributor.author | Ngothai, Y. | - |
dc.contributor.author | O'Neill, B. | - |
dc.contributor.author | Hooker, A. | - |
dc.contributor.author | Mosselmans, F. | - |
dc.contributor.author | Brugger, J. | - |
dc.date.issued | 2015 | - |
dc.identifier.citation | American Mineralogist: an international journal of earth and planetary materials, 2015; 100(8-9):1728-1735 | - |
dc.identifier.issn | 0003-004X | - |
dc.identifier.issn | 1945-3027 | - |
dc.identifier.uri | http://hdl.handle.net/2440/101049 | - |
dc.description.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. | - |
dc.description.statementofresponsibility | Kan Li, Allan Pring, Barbara Etschmann, Edeltraud Macmillan, Yung Ngothai, Brian O, Neill, Anthony Hooker, Fred Mosselmans, Joël Brugger | - |
dc.language.iso | en | - |
dc.publisher | Mineralogical Society of America | - |
dc.rights | © 2015 Mineralogical Society of America | - |
dc.source.uri | http://dx.doi.org/10.2138/am-2015-5125 | - |
dc.subject | Uranium; scavenging; IOCG deposits; experiment; sulfidation reaction; interface coupled dissolution-reprecipitation reactions | - |
dc.title | Uranium scavenging during mineral replacement reactions | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.2138/am-2015-5125 | - |
dc.relation.grant | http://purl.org/au-research/grants/arc/DP1095069 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Ngothai, Y. [0000-0002-0199-4225] | - |
dc.identifier.orcid | Hooker, A. [0000-0003-2324-4748] | - |
Appears in Collections: | Aurora harvest 3 Chemical Engineering publications |
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