Influence of metasomatism on vanadium-based redox proxies for mantle peridotite

  • The multi-valence nature of vanadium means that its geochemical behaviour will be ƒO2-dependent, so that its concentration or V/Sc (or V/Ga), can serve as proxies for oxidation state in mantle peridotites. Compared to Fe3+/Fe2+-based equilibria, such trace elements may be less sensitive to metasomatic processes. To investigate these systematics, we have measured V, Sc, Ga and Fe3+ contents in clinopyroxene from well-characterised spinel peridotite xenoliths from the Massif Central, France. These samples were metasomatised by a variety of agents with different oxidation states.V contents can be modified by metasomatic interactions, and other geochemically similar elements including Sc and Ga can also be added, removed or remain constant. A link between V/Sc and Fe3+-Fe2+ equilibria is apparent. Partial removal of V is caused by different metasomatic agents; the common factor is that all agents were significantly more oxidised than the initial ambient mantle peridotite. This extraction can be understood by a decreasing partition coefficient for V for ΔlogƒO2 > ~FMQ-2. Considering that mineral/melt partitioning of V decreases similarly for all peridotite minerals, the bulk-rock V/Sc will also change during relatively oxidising metasomatic interactions and mirror the results obtained for clinopyroxene.

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Author:Alan B. WoodlandGND, Laura Uenver-Thiele, Hans-Michael SeitzGND
Parent Title (English):Geochemical perspectives letters
Place of publication:[Paris]
Contributor(s):Cin-Ty Lee
Document Type:Article
Year of Completion:2018
Date of first Publication:2018/09/07
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2018/11/01
Tag:Mössbauer spectroscopy; V/Sc; metasomatism; oxidation state; peridotite; vanadium
Page Number:6
First Page:11
Last Page:16
Published by the European Association of Geochemistry under Creative Commons License CC BY 4.0
Institutes:Geowissenschaften / Geographie / Geowissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Open-Access-Publikationsfonds:Geowissenschaften / Geographie
Licence (German):License LogoCreative Commons - Namensnennung 4.0