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Science 23 February 2001:
Vol. 291. no. 5508, pp. 1527 - 1530
DOI: 10.1126/science.1057594
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Reports
Redox State of Mars' Upper Mantle and Crust from Eu Anomalies in Shergottite Pyroxenes
M. Wadhwa
The oxidation state of basaltic martian meteorites is determined
from the partitioning of europium (Eu) in their pyroxenes. The
estimated redox conditions for these samples correlate with their
initial neodymium and strontium isotopic compositions. This is
interpreted to imply varying degrees of interaction between the
basaltic parent melts, derived from a source in the martian mantle, and
a crustal component. Thus, the mantle source of these martian basalts
may have a redox state close to that of the iron-wüstite buffer,
whereas the martian crust may be more oxidized (with a redox state
higher than or equal to that of the quartz-fayalite-magnetite buffer).
A difference in redox state of more than 3 log units between mantle and
crustal reservoirs on Mars could result from oxidation of the crust by
a process such as aqueous alteration, together with a subsequent lack
of recycling of this oxidized crust through the reduced upper mantle.
Department of Geology, The Field Museum, 1400 South Lake Shore
Drive, Chicago, IL 60605, USA. E-mail: mwadhwa{at}fieldmuseum.org
Read the Full Text
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Redox Conditions on Small Bodies, the Moon and Mars.
- M. Wadhwa (2008)
Reviews in Mineralogy and Geochemistry
68, 493-510
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- Basalts as Probes of Planetary Interior Redox State.
- C. D. K. Herd (2008)
Reviews in Mineralogy and Geochemistry
68, 527-553
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- Pyroxene europium valence oxybarometer: Effects of pyroxene composition, melt composition, and crystallization kinetics.
- C.K. Shearer, J.J. Papike, and J.M. Karner (2006)
American Mineralogist
91, 1565-1573
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- Comparative planetary mineralogy: Pyroxene major- and minor-element chemistry and partitioning of vanadium between pyroxene and melt in planetary basalts.
- J. Karner, J.J. Papike, and C.K. Shearer (2006)
American Mineralogist
91, 1574-1582
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- Insights into the redox history of the NWA 1068/1110 martian basalt from mineral equilibria and vanadium oxybarometry.
- C. D.K. Herd (2006)
American Mineralogist
91, 1616-1627
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- The SNC meteorites: basaltic igneous processes on Mars.
- J.C. Bridges and P.H. Warren (2006)
Journal of the Geological Society
163, 229-251
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- Application of a new vanadium valence oxybarometer to basaltic glasses from the Earth, Moon, and Mars.
- J. M. Karner, S. R. Sutton, J. J. Papike, C. K. Shearer, J. H. Jones, and M. Newville (2006)
American Mineralogist
91, 270-277
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- Iron partitioning between basaltic melts and clinopyroxene as a function of oxygen fugacity.
- M. C. McCanta, M. D. Dyar, M. J. Rutherford, and J. S. Delaney (2004)
American Mineralogist
89, 1685-1693
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- Comparative planetary mineralogy: V/(Cr + Al) systematics in chromite as an indicator of relative oxygen fugacity.
- J. J. Papike, J.J. Papike, J.M. Karner, and C.K. Shearer (2004)
American Mineralogist
89, 1557-1560
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- Plagioclase from planetary basalts: Chemical signatures that reflect planetary volatile budgets, oxygen fugacity, and styles of igneous differentiation.
- J. Karner, J.J. Papike, and C.K. Shearer (2004)
American Mineralogist
89, 1101-1109
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- The behavior of Li and B during planetary basalt crystallization.
- C. D. K. Herd, C. D. K. Herd, A. H. Treiman, G. A. Mckay, and C. K. Shearer (2004)
American Mineralogist
89, 832-840
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