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Temperature and pressure effects on the partitioning of V and Sc between clinopyroxene and silicate melt: Implications for mantle oxygen fugacity

  • Yuan Li EMAIL logo
Published/Copyright: April 30, 2018
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Abstract

The partition coefficients of V and Sc between clinopyroxene and silicate melt (DVCpx/SMandDScCpx/SM) have been determined experimentally at 1200–1400 °C and 0.8–2.3 GPa, using a hornblende- and clinopyroxene-rich mantle rock in graphite-lined Pt95Rh05 capsules. The results show that the DVCpx/SM and DScCpx/SM values decrease from 3.8 to 2.3 and from 2.6 to 1.1, respectively, as the experimental temperature and pressure vary from 1200 °C and 0.8 GPa to 1400 °C and 2.3 GPa. The presence of water in silicate melts may also reduce DVCpx/SMandDScCpx/SM. These results imply that the effects of temperature, pressure, and melt water content on DVCpx/SM should be considered when using V systematics in cratonic mantle peridotites to constrain cratonic mantle oxygen fugacity (fo2). However, although the dominant V in the present silicate melt is mixed V3+ and V4+, the DVCpx/SM/DScCpx/SM together with literature data obtained at similar fo2 shows a nearly constant value of 1.68 ± 0.26, regardless of temperature, pressure, melt composition, and melt water content, indicating that these factors cannot cause fractionation of Sc3+ from mixed V3+ and V4+ in mantle melts through clinopyroxene/silicate melt partitioning. Therefore, in combination with V/Sc systematics in primitive MORBs and arc basalts, using DVCpx/SMandDScCpx/SM obtained at 1 bar and dry conditions should be valid to constrain mantle fo2 except for the case that the DCpx/SM for Sc3+ can be demonstrated to be fractionated from the DCpx/SM for mixed V4+ and V5+, which are present in oxidized basalts.

Acknowlegments

Support from the Recruitment Program of Global Young Experts (PR China) is appreciated. Constructive reviews by Maryjo Brounce, Ian Swainson, and two anonymous reviewers significantly improved this paper.

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Received: 2018-1-4
Accepted: 2018-2-13
Published Online: 2018-4-30
Published in Print: 2018-5-25

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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