TY  - JOUR
A1  - Woodland, Alan B.
A1  - Uenver-Thiele, Laura
A1  - Seitz, Hans-Michael
T1  - Influence of metasomatism on vanadium-based redox proxies for mantle peridotite
T2  - Geochemical perspectives letters
N2  - 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.
KW  - peridotite
KW  - oxidation state
KW  - Mössbauer spectroscopy
KW  - vanadium
KW  - V/Sc
KW  - metasomatism
Y1  - 2018
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/47905
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-479058
SN  - 2410-3403
SN  - 2410-339X
N1  - Published by the European Association of Geochemistry under Creative Commons License CC BY 4.0
VL  - 8
SP  - 11
EP  - 16
PB  - Assoc.
CY  - [Paris]
ER  -