|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
1 Institute of Meteoritics, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, U.S.A.
2 Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, U.S.A.
3 Consortium for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, U.S.A.
4 NASA Johnson Space Center, Houston, Texas 77058, U.S.A.
Correspondence: * E-mail: jkarner{at}unm.edu
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.
Key Words: Oxygen fugacity • planetary basalts • vanadium • oxidation state • Mars • XANES
This article has been cited by other articles:
|
|
 |
|
  M. Wadhwa Redox Conditions on Small Bodies, the Moon and Mars Reviews in Mineralogy and Geochemistry, January 1, 2008; 68(1): 493 - 510. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. D. K. Herd Basalts as Probes of Planetary Interior Redox State Reviews in Mineralogy and Geochemistry, January 1, 2008; 68(1): 527 - 553. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 H. Uchida, K. Righter, B. Lavina, M. M. Nowell, S. I. Wright, R. T. Downs, and H. Yang Investigation of synthetic Mg1.3V1.7O4 spinel with MgO inclusions: Case study of a spinel with an apparently occupied interstitial site American Mineralogist, July 1, 2007; 92(7): 1031 - 1037. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J.M. Karner, J.J. Papike, C.K. Shearer, G. McKay, L. Le, and P. Burger Valence state partitioning of Cr and V between pyroxene-melt: Estimates of oxygen fugacity for martian basalt QUE 94201 American Mineralogist, July 1, 2007; 92(7): 1238 - 1241. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. J. Hagerty, C. K. Shearer, D. T. Vaniman, and P. V. Burger Identifying the effects of petrologic processes in a closed basaltic system using trace-element concentrations in olivines and glasses: Implications for comparative planetology American Mineralogist, October 1, 2006; 91(10): 1499 - 1508. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C.K. Shearer, J.J. Papike, and J.M. Karner Pyroxene europium valence oxybarometer: Effects of pyroxene composition, melt composition, and crystallization kinetics American Mineralogist, October 1, 2006; 91(10): 1565 - 1573. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Karner, J.J. Papike, and C.K. Shearer Comparative planetary mineralogy: Pyroxene major- and minor-element chemistry and partitioning of vanadium between pyroxene and melt in planetary basalts American Mineralogist, October 1, 2006; 91(10): 1574 - 1582. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. Righter, S.R. Sutton, M. Newville, L. Le, C.S Schwandt, H. Uchida, B. Lavina, and R.T. Downs An experimental study of the oxidation state of vanadium in spinel and basaltic melt with implications for the origin of planetary basalt American Mineralogist, October 1, 2006; 91(10): 1643 - 1656. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. Balan, J. P.R. De Villiers, S. G. Eeckhout, P. Glatzel, M. J. Toplis, E. Fritsch, T. Allard, L. Galoisy, and G. Calas The oxidation state of vanadium in titanomagnetite from layered basic intrusions American Mineralogist, May 1, 2006; 91(5-6): 953 - 956. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
