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Application of a new vanadium valence oxybarometer to basaltic glasses from the Earth, Moon, and Mars
-
Jim M. Karner
,
Steven R. Sutton
Published/Copyright:
March 31, 2015
Abstract
The redox states of volcanic and impact melts from the Earth, Moon, and Mars have been estimated from the valence state of V in basaltic glasses (Sutton et al. 2005). The V valence has been determined using synchrotron micro X-ray absorption near-edge structure spectroscopy (XANES) (Sutton et al. 2005), which allows for in situ measurements on samples with a micrometer spatial resolution and ~100 ppm elemental sensitivity. Here, we interpret those results for the natural samples and compare them to the literature. The results show that terrestrial melts are dominated by V4+, lunar samples by V3+, with Martian melts a mixture of both V3+ and V4+. The fO₂ estimates derived from the V valence are consistent with those determined by other proven methods, whereby terrestrial basalts experience fO₂ conditions within 1 or 2 log units of the QFM buffer, lunar basalts equilibrate at 1 to 2 log units below the IW buffer, and Martian basalts fall somewhere between the QFM and IW buffer. The results illustrate the usefulness of this technique; i.e., a robust oxybarometer covering over six orders of magnitude, applicable to samples that record fO₂ conditions from reduced extraterrestrial bodies to the oxidized Earth.
Received: 2004-10-10
Accepted: 2005-8-23
Published Online: 2015-3-31
Published in Print: 2006-2-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Oxygen fugacity;
planetary basalts;
vanadium;
oxidation state;
Mars;
XANES
Articles in the same Issue
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- Pressure-induced hydration in zeolite tetranatrolite
- Annealing experiments on induced fission tracks in apatite: Measurements of horizontal-confined track lengths and track densities in basal sections and randomly oriented grains
- Alpersite (Mg,Cu)SO4·7H2O, a new mineral of the melanterite group, and cuprian pentahydrite: Their occurrence within mine waste
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- Hydrogen incorporation in olivine from 2–12 GPa
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- Thermodynamics and kinetics of cation ordering in natural and synthetic Mg(Al,Fe3+)2O4 spinels from in situ high-temperature X-ray diffraction
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- TEM imaging and analysis of microinclusions in diamonds: A close look at diamond-growing fluids
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