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| Titel |
New mineralogies of the Southern Martian Crust, as identified by the OMEGA/MEx investigation |
| VerfasserIn |
B. Gondet, Y. Langevin, F. Poulet, J. P. Bibring |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026628
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| Zusammenfassung |
| Observations by OMEGA of regions at high southern latitudes revealed an increased
hydration level as determined from the 3 μm absorption band [1], associated with polar
layered deposits (Apl unit in [2]). The same regions are characterized by a weak, broad
absorption feature which is shifted toward longer wavelengths when compared with the 1.9
μm feature of most hydrated minerals. A few H2O-bearing sulfates (in particular romerite
and amarantite) exhibit such a broad absorption band near 2.0 μm [3]. However, there is no
strong evidence of other spectral signatures of such minerals in the OMEGA spectra,
hence there is as yet no unambiguous identification of hydrated minerals in high
latitude southern terrains. This issue will be reinvestigated taking advantage of
new observations of these areas with an improved resolution as the pericenter of
Mars Express is at high southern latitudes during southern spring and summer in
2009.
References : [1] F. Poulet et al. (2009) in press, Geophysical Research Letters; [2]
Tanaka, K. L., and D. H. Scott (1987), U.S.G.S. Misc. Invest. Ser. Map, I-1802-C, U.S.
Geological Survey, Reston, VA.
[3] Cloutis, E. A., et al. (2006), Icarus, 184, 121– 157 |
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