Journal
AMERICAN MINERALOGIST
Volume 98, Issue 11-12, Pages 2193-2196Publisher
MINERALOGICAL SOC AMER
DOI: 10.2138/am.2013.4622
Keywords
Vanadium; oxybarometry; Mars; Yamato 980459; spinel; olivine; XANES
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Funding
- NASA Cosmochemistry grants
- National Science Foundation-Earth Sciences [EAR-1128799]
- Department of Geosciences [DE-FG02-94ER14466]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Science [DE-AC02-06CH11357]
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A spiked (with REE, V, Sc) martian basalt Yamato 980459 (Y98) composition was used to synthesize olivine, spinel, and pyroxene at 1200 degrees C at five oxygen fugacities: IW-1, IW, IW+1, IW+2, and QFM. These run products were analyzed by electron microprobe, ion microprobe, and X-ray absorption near-edge spectroscopy to establish four oxybarometers based on vanadium partitioning behavior between the following pairs of phases: V spinel-melt, V/(Cr+Al) spinel-melt, olivine-melt, and spinel-olivine. The results for the spinel-melt, olivine-melt, and V/(Cr+Al) spinel-melt are applicable for the entire oxygen fugacity range while the spinel-olivine oxybarometer is only applicable between IW-1 and IW+1. The oxybarometer based on V partitioning between spinel-olivine is restricted to basalts that crystallized under low oxygen fugacities, some martian, all lunar, as well as samples from 4 Vesta. The true potential and power of the new spinel-olivine oxybarometer is that it does not require samples representative of a melt composition or samples with some remnant of quenched melt present. It just requires that the spinel-olivine pairs were in equilibrium when the partitioning of V occurred. We have applied the V spinel-olivine oxybarometer to the Y98 meteorite as a test of the method.
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