Matches in SemOpenAlex for { <https://semopenalex.org/work/W76866024> ?p ?o ?g. }
Showing items 1 to 70 of
70
with 100 items per page.
- W76866024 abstract "The redox states of planetary interiors can be inferred from the abundance, partitioning behaviour or direct valence determination of redox-sensitive elements in the mineral-melt assemblages of mantle rocks and their partial melting products. An element that has received considerable attention due to its large number of possible valence states in silicate melts and minerals is vanadium (V2+, V3+, V4+ and V5+). The transition from V2+ to V5+ covers the entire spectrum of redox conditions of the inner solar system, hence there is potential for V to be used as a universal redox sensor in geological and cosmochemical materials. A comprehensive experimental study aimed at investigating the speciation and partitioning behaviour of V using LA-ICP-MS and XANES techniques is presented. The results indicate that the interpretation of direct valence determinations in basaltic glasses at room temperature may be complicated by the effect of charge-transfer reactions, particularly between V and Cr at more reducing conditions. Modelling the bulk-rock abundances of V relative to homovalent elements also appears not to be effective as a redox indicator in basalt suites, because the influences of variables other than oxygen fugacity and source heterogeneity overwhelm the redox signal. As an alternative to both methods, we propose that the direct determination of V partition coefficients be- tween basaltic matrix and olivine phenocrysts can be used effectively as a redox sensor in planetary olivine-phyric mafic volcanics, recording the oxygen fugacity at the pre-eruptive stage of the magma’s history and thus avoiding effects from degassing, reaction with the atmosphere and subsequent alteration. This method is formulated, tested and applied to 79 recent olivine-phyric terrestrial mafic volcanics. The results indicate that MORBs and OIBs record a restricted and statistically identical range of redox conditions, from QFM to QFM+1. In contrast, IABs record significantly more oxidizing conditions, from QFM+1 to QFM+2.5. Additional partitioning experiments carried out over a large range of redox conditions were used to constrain the behaviour of Re during basalt petrogenesis. Oxygen fugacity was shown to have a strong effect on the bulk geochemical behaviour of Re because Re4+ is compatible and Re6+ is highly incompatible in most minerals. Therefore, Re is expected to be compatible during the genesis of lunar basalts, moderately incompat- ible during the genesis of MORBs, and highly incompatible during the genesis of IABs. Oxygen fugacity should therefore be considered a critical variable in the interpretation of Re-Os isotopic systematics applied to mantle and mantle-derived rocks." @default.
- W76866024 created "2016-06-24" @default.
- W76866024 creator A5010956897 @default.
- W76866024 date "2008-10-30" @default.
- W76866024 modified "2023-09-23" @default.
- W76866024 title "Mantle redox state and its effect on trace-element partitioning during basalt petrogenesis" @default.
- W76866024 doi "https://doi.org/10.25911/5d5e772c0f231" @default.
- W76866024 hasPublicationYear "2008" @default.
- W76866024 type Work @default.
- W76866024 sameAs 76866024 @default.
- W76866024 citedByCount "0" @default.
- W76866024 crossrefType "dissertation" @default.
- W76866024 hasAuthorship W76866024A5010956897 @default.
- W76866024 hasConcept C127313418 @default.
- W76866024 hasConcept C161509811 @default.
- W76866024 hasConcept C168900304 @default.
- W76866024 hasConcept C17409809 @default.
- W76866024 hasConcept C178790620 @default.
- W76866024 hasConcept C179104552 @default.
- W76866024 hasConcept C185592680 @default.
- W76866024 hasConcept C199289684 @default.
- W76866024 hasConcept C2777335606 @default.
- W76866024 hasConcept C2778998827 @default.
- W76866024 hasConcept C2780364934 @default.
- W76866024 hasConcept C44938399 @default.
- W76866024 hasConcept C55904794 @default.
- W76866024 hasConcept C67236022 @default.
- W76866024 hasConcept C93746451 @default.
- W76866024 hasConceptScore W76866024C127313418 @default.
- W76866024 hasConceptScore W76866024C161509811 @default.
- W76866024 hasConceptScore W76866024C168900304 @default.
- W76866024 hasConceptScore W76866024C17409809 @default.
- W76866024 hasConceptScore W76866024C178790620 @default.
- W76866024 hasConceptScore W76866024C179104552 @default.
- W76866024 hasConceptScore W76866024C185592680 @default.
- W76866024 hasConceptScore W76866024C199289684 @default.
- W76866024 hasConceptScore W76866024C2777335606 @default.
- W76866024 hasConceptScore W76866024C2778998827 @default.
- W76866024 hasConceptScore W76866024C2780364934 @default.
- W76866024 hasConceptScore W76866024C44938399 @default.
- W76866024 hasConceptScore W76866024C55904794 @default.
- W76866024 hasConceptScore W76866024C67236022 @default.
- W76866024 hasConceptScore W76866024C93746451 @default.
- W76866024 hasLocation W768660241 @default.
- W76866024 hasOpenAccess W76866024 @default.
- W76866024 hasPrimaryLocation W768660241 @default.
- W76866024 hasRelatedWork W139345799 @default.
- W76866024 hasRelatedWork W1542042645 @default.
- W76866024 hasRelatedWork W1628383677 @default.
- W76866024 hasRelatedWork W1982630226 @default.
- W76866024 hasRelatedWork W1991492676 @default.
- W76866024 hasRelatedWork W1996431679 @default.
- W76866024 hasRelatedWork W2009134313 @default.
- W76866024 hasRelatedWork W2050060766 @default.
- W76866024 hasRelatedWork W2065757458 @default.
- W76866024 hasRelatedWork W2081597995 @default.
- W76866024 hasRelatedWork W2089418355 @default.
- W76866024 hasRelatedWork W2160151635 @default.
- W76866024 hasRelatedWork W2281216012 @default.
- W76866024 hasRelatedWork W2889910942 @default.
- W76866024 hasRelatedWork W3000263371 @default.
- W76866024 hasRelatedWork W3035705559 @default.
- W76866024 hasRelatedWork W3045044562 @default.
- W76866024 hasRelatedWork W594250633 @default.
- W76866024 hasRelatedWork W1648664978 @default.
- W76866024 hasRelatedWork W1671696166 @default.
- W76866024 isParatext "false" @default.
- W76866024 isRetracted "false" @default.
- W76866024 magId "76866024" @default.
- W76866024 workType "dissertation" @default.