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dc.contributor.authorMare, Eleanor
dc.contributor.authorO'Neill, Hugh St. C.
dc.contributor.authorBerry, Andrew
dc.contributor.authorGlover, Chris
dc.date.accessioned2020-11-02T00:37:53Z
dc.date.available2020-11-02T00:37:53Z
dc.date.issued2020-01-20
dc.identifier.citationMare , E , O'Neill , H S C , Berry , A & Glover , C 2020 , ' The stability of divalent Ge in silicate melts and its geochemical properties ' , Chemical Geology , vol. 532 , 119306 . https://doi.org/10.1016/j.chemgeo.2019.119306en
dc.identifier.issn0009-2541
dc.identifier.otherPURE: 263236338
dc.identifier.otherPURE UUID: 06dbea29-dced-423e-a676-e9a7a44bb031
dc.identifier.otherORCID: /0000-0003-0531-7755/work/65014452
dc.identifier.otherScopus: 85075483293
dc.identifier.otherWOS: 000513868400035
dc.identifier.urihttp://hdl.handle.net/10023/20870
dc.descriptionHON gratefully acknowledges funding from the Australian Research Council through grant FL130100066.en
dc.description.abstractThe oxidation state of Ge in silicate glasses, quenched from melts, was determined by X-ray absorption spectroscopy. The melts were equilibrated over the range of relative oxygen fugacities (fO2) from IW -3 to IW + 10, where IW is the iron-wüstite oxygen buffer in logarithmic units. X-ray absorption near edge structure (XANES) spectra of the samples show that over the range in fO2 from IW -2.8 to IW + 2.4, the Ge4+/(Ge2+ + Ge4+) ratio increases from 0.05 to 0.95. Modelling of extended X-ray absorption fine structure (EXAFS) gives the Ge2+–O bond length as 1.89 ± 0.03 Å. Olivine–melt partitioning experiments were also conducted, which show that Ge2+ is highly incompatible, with DGe2+ol/melt < 0.005, whereas DGe4+ol/melt is ∼ 1, where D is the partition coefficient. The geochemical properties of Ge during the magmatic differentiation of the Moon and other reduced rocky planets and achondrite parent bodies will therefore be entirely different to that familiar from terrestrial examples. In particular, the incompatible nature of Ge2+ may explain the anomalous enrichment of Ge in KREEP basalts.
dc.language.isoeng
dc.relation.ispartofChemical Geologyen
dc.rightsCopyright © 2019 Published by Elsevier B.V. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.chemgeo.2019.119306en
dc.subjectGermaniumen
dc.subjectSilicate melten
dc.subjectOxidation stateen
dc.subjectXANESen
dc.subjectEXAFSen
dc.subjectPartitioningen
dc.subjectGE Environmental Sciencesen
dc.subjectQE Geologyen
dc.subjectDASen
dc.subject.lccGEen
dc.subject.lccQEen
dc.titleThe stability of divalent Ge in silicate melts and its geochemical propertiesen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.identifier.doihttps://doi.org/10.1016/j.chemgeo.2019.119306
dc.description.statusPeer revieweden
dc.date.embargoedUntil2020-11-02


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