Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/74140
Citations | ||
Scopus | Web of Science® | Altmetric |
---|---|---|
?
|
?
|
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Borg, S. | - |
dc.contributor.author | Liu, W. | - |
dc.contributor.author | Etschmann, B. | - |
dc.contributor.author | Tian, Y. | - |
dc.contributor.author | Brugger, J. | - |
dc.date.issued | 2012 | - |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2012; 92:292-307 | - |
dc.identifier.issn | 0016-7037 | - |
dc.identifier.issn | 1872-9533 | - |
dc.identifier.uri | http://hdl.handle.net/2440/74140 | - |
dc.description.abstract | Molybdenum(VI) is expected to be the main form of Mo in hydrothermal fluids up to magmatic hydrothermal conditions. We conducted an in situ X-ray absorption spectroscopic study of Mo(VI) speciation in H2O-HCl-NaCl brines up to 385°C at a pressure of 600bar. The EXAFS (Extended X-ray Absorption Fine Structure) and XANES (X-ray Absorption Near-Edge Structure) data supported by ab-initio XANES calculations confirm that tetrahedral complexes containing the molybdate anion (MoO42-) predominate in basic to near neutral solutions with chloride concentration up to 5.5m. The geometry of this species changes little over the investigated P-T range, and there is no complexation between MoO42- and chloride. In highly acidic solutions, Mo(VI) speciation is dominated by distorted octahedral oxo-chloro complexes MoOmCln6-2m-n; the number of chloride ligands increases with increasing temperature, to a maximum of ∼5 (e.g., MoOCl5-) at 340°C in 6.21m HCl. These data suggest that Mo speciation is dominated by tetrahedral molybdate species (e.g., HMoO4- or MoO42-) in the basic to near neutral solution phase of natural hydrothermal fluid, and chloride complexes will only play a significant role in highly acidic fluid under our experimental P-T conditions. © 2012 Elsevier Ltd. | - |
dc.description.statementofresponsibility | Stacey Borg, Weihua Liu, Barbara Etschmann, Yuan Tian and Joël Brugger | - |
dc.language.iso | en | - |
dc.publisher | Pergamon-Elsevier Science Ltd | - |
dc.rights | Copyright © 2012 Elsevier B.V. | - |
dc.source.uri | http://dx.doi.org/10.1016/j.gca.2012.06.001 | - |
dc.title | An XAS study of molybdenum speciation in hydrothermal chloride solutions from 25-385ºC and 600 bar | - |
dc.title.alternative | An XAS study of molybdenum speciation in hydrothermal chloride solutions from 25-385 degree(s) C and 600 bar | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1016/j.gca.2012.06.001 | - |
dc.relation.grant | http://purl.org/au-research/grants/arc/DP0878903 | - |
pubs.publication-status | Published | - |
Appears in Collections: | Aurora harvest 4 Earth and Environmental Sciences 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.