Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/159451
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dc.contributor.authorFarsang, Stefanen_US
dc.contributor.authorLouvel, Marionen_US
dc.contributor.authorRosa, Angelika D.en_US
dc.contributor.authorAmboage, Monicaen_US
dc.contributor.authorAnzellini, Simoneen_US
dc.contributor.authorWidmer, Remo N.en_US
dc.contributor.authorRedfern, Simon Anthony Turneren_US
dc.date.accessioned2022-06-21T05:00:39Z-
dc.date.available2022-06-21T05:00:39Z-
dc.date.issued2021-
dc.identifier.citationFarsang, S., Louvel, M., Rosa, A. D., Amboage, M., Anzellini, S., Widmer, R. N. & Redfern, S. A. T. (2021). Effect of salinity, pressure and temperature on the solubility of smithsonite (ZnCO₃) and Zn complexation in crustal and upper mantle hydrothermal fluids. Chemical Geology, 578, 120320-. https://dx.doi.org/10.1016/j.chemgeo.2021.120320en_US
dc.identifier.issn0009-2541en_US
dc.identifier.urihttps://hdl.handle.net/10356/159451-
dc.description.abstractModelling the reservoirs and fluxes of Zn in Earth's crust and mantle requires data on the solubility of its mineral hosts and ores in coexisting fluids, as well as on the complexation of Zn in these fluids as a function of fluid composition, pressure, and temperature. However, due to experimental challenges, the availability of such data is limited to pressures below 1 GPa, which are only representative of upper crust conditions. Here, we report the effects of salinity (0–4.5 m total Cl), pressure (0.5–6 GPa) and temperature (25–400 °C) on the solubility of smithsonite (ZnCO3) and speciation of Zn in aqueous fluids. Solubilities at mineral-fluid equilibria and Zn speciation in the coexisting aqueous fluids were determined in situ at high pressure-temperature (P-T) conditions by synchrotron X-ray fluorescence (XRF) and X-ray absorption spectroscopy (XAS) using resistively heated diamond anvil cells (RH-DAC). The solubility of smithsonite increases with salinity, pressure, and temperature. In agreement with previous studies, conducted at lower pressures (below 1 GPa), we observed a gradual transition from octahedral hydrated [Zn(H2O)6]2+ to tetrahedral hydrated and chlorinated [Zn(H2O)4-nCln]2-n (n = 1–4) complexes with increasing salinity and temperature. Our results suggest that these tetrahedral complexes remain stable under the conditions relevant to cold slab dehydration. This change of coordination further enhances the solubility of smithsonite in Cl-rich fluids and provides a likely mechanism for the efficient uptake of Zn by slab-derived fluids.en_US
dc.language.isoenen_US
dc.relation.ispartofChemical Geologyen_US
dc.rights© 2021 Elsevier B.V. All rights reserved.en_US
dc.subjectEngineering::Environmental engineeringen_US
dc.titleEffect of salinity, pressure and temperature on the solubility of smithsonite (ZnCO₃) and Zn complexation in crustal and upper mantle hydrothermal fluidsen_US
dc.typeJournal Articleen
dc.contributor.schoolAsian School of the Environmenten_US
dc.identifier.doi10.1016/j.chemgeo.2021.120320-
dc.identifier.scopus2-s2.0-85105791217-
dc.identifier.volume578en_US
dc.identifier.spage120320en_US
dc.subject.keywordsZinc Speciationen_US
dc.subject.keywordsSmithsoniteen_US
dc.description.acknowledgementThis work was supported by the Natural Environment Research Council (grant number NE/L002507/1).en_US
item.grantfulltextnone-
item.fulltextNo Fulltext-
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