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Title: Developing vanadium valence state oxybarometers (spinel-melt, olivine-melt, spinel-olivine) and V/(Cr+Al) partitioning (spinel-melt) for martian olivine-phyric basalts

Authors:
; ; ; ; ; ; ;  [1];  [2];  [2]
  1. (UNM)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
NSFDOE - BASIC ENERGY SCIENCES
OSTI Identifier:
1107422
Resource Type:
Journal Article
Resource Relation:
Journal Name: Am. Mineral.; Journal Volume: 98; Journal Issue: (11-12) ; 2013
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Papike, J.J., Burger, P.V., Bell, A.S., Le, L., Shearer, C.K., Sutton, S.R., Jones, J., Newville, M., NASA-JSC), and UC). Developing vanadium valence state oxybarometers (spinel-melt, olivine-melt, spinel-olivine) and V/(Cr+Al) partitioning (spinel-melt) for martian olivine-phyric basalts. United States: N. p., 2013. Web. doi:10.2138/am.2013.4622.
Papike, J.J., Burger, P.V., Bell, A.S., Le, L., Shearer, C.K., Sutton, S.R., Jones, J., Newville, M., NASA-JSC), & UC). Developing vanadium valence state oxybarometers (spinel-melt, olivine-melt, spinel-olivine) and V/(Cr+Al) partitioning (spinel-melt) for martian olivine-phyric basalts. United States. doi:10.2138/am.2013.4622.
Papike, J.J., Burger, P.V., Bell, A.S., Le, L., Shearer, C.K., Sutton, S.R., Jones, J., Newville, M., NASA-JSC), and UC). Thu . "Developing vanadium valence state oxybarometers (spinel-melt, olivine-melt, spinel-olivine) and V/(Cr+Al) partitioning (spinel-melt) for martian olivine-phyric basalts". United States. doi:10.2138/am.2013.4622.
@article{osti_1107422,
title = {Developing vanadium valence state oxybarometers (spinel-melt, olivine-melt, spinel-olivine) and V/(Cr+Al) partitioning (spinel-melt) for martian olivine-phyric basalts},
author = {Papike, J.J. and Burger, P.V. and Bell, A.S. and Le, L. and Shearer, C.K. and Sutton, S.R. and Jones, J. and Newville, M. and NASA-JSC) and UC)},
abstractNote = {},
doi = {10.2138/am.2013.4622},
journal = {Am. Mineral.},
number = (11-12) ; 2013,
volume = 98,
place = {United States},
year = {Thu Dec 05 00:00:00 EST 2013},
month = {Thu Dec 05 00:00:00 EST 2013}
}
  • Experiments on a Martian basalt composition show that D{sub V} augite/melt is greater than D{sub V} pigeonite/melt in samples equilibrated under the same fO{sub 2} conditions. This increase is due to the increased availability of elements for coupled substitution with the V{sup 3+} or V{sup 4+} ions, namely Al and Na. for this bulk composition, both Al and Na are higher in concentration in augite compared with pigeonite; therefore more V can enter augite than pigeonite. Direct valence state determination by XANES shows that the V{sup 3+} and V{sup 4+} are the main V species in the melt at fO{submore » 2} conditions of IW-1 to IW+3.5, whereas pyroxene grains at IW-1, IW, and IW+1 contain mostly V{sup 3+}. This confirms the idea that V{sup 3+} is more compatible in pyroxene than V{sup 4+}. The Xanes data also indicates that a small percentage of V{sup 2+} may exist in melt and pyroxene at IW-1. The similar valence of V in glass and pyroxene at IW-1 suggests that V{sup 2+} and V{sup 3+} may have similar compatibilities in pyroxene.« less
  • Chromium and vanadium are stable in multiple valence states in natural systems, and their distribution between garnet and silicate melt is not well understood. Here, the partitioning and valence state of V and Cr in experimental garnet/melt pairs have been studied at 1.8-3.0 GPa, with variable oxygen fugacity between IW-1.66 and the Ru-RuO{sub 2} (IW+9.36) buffer. In addition, the valence state of V and Cr has been measured in several high-pressure (majoritic garnet up to 20 GPa) experimental garnets, some natural megacrystic garnets from the western United States, and a suite of mantle garnets from South Africa. The results showmore » that Cr remains in trivalent in garnet across a wide range of oxygen fugacities. Vanadium, on the other hand, exhibits variable valence state from 2.5 to 3.7 in the garnets and from 3.0 to 4.0 in the glasses. The valence state of V is always greater in the glass than in the garnet. Moreover, the garnet/melt partition coefficient, D(V), is highest when V is trivalent, at the most reduced conditions investigated (IW-1.66 to FMQ). The V{sup 2.5+} measured in high P-T experimental garnets is consistent with the reduced nature of those metal-bearing systems. The low V valence state measured in natural megacrystic garnets is consistent with f{sub O{sub 2}} close to the IW buffer, overlapping the range of f{sub O{sub 2}} measured independently by Fe{sup 2+}/Fe{sup 3+} techniques on similar samples. However, the valence state of V measured in a suite of mantle garnets from South Africa is constant across a 3 log f{sub O{sub 2}} unit range (FMQ-1.8 to FMQ-4.5), suggesting that the valence state of V is controlled by the crystal chemistry of the garnets rather than f{sub O{sub 2}} variations. The compatibility of V and Cr in garnets and other deep mantle silicates indicates that the depletion of these elements in the Earth's primitive upper mantle could be due to partitioning into lower mantle phases as well as into metal.« less
  • This paper continues the study of the partitioning of multivalent elements between pyroxene-melt in synthetic charges of martian basalt QUE 94201 composition. Here we concentrate on the partitioning of V between augite/melt and pigeonite/melt. Previous studies have used the partitioning of V between minerals and melt to estimate the fO2 condition and setting of terrestrial and extraterrestrial lavas. Although the V partitioning studies have been successful in estimating fO{sub 2}, they provide no direct determination of V valence in the minerals or the melt. That information is now obtainable through XANES spectroscopy, and here we report XANES data on themore » same pyroxene grains that we measured the partitioning data.« less