Searching for the source regions of martian meteorites using MGS TES

Integrating martian meteorites into the global distribution of igneous materials on Mars

Victoria E. Hamilton, Philip Christensen, Harry Y. McSween, Joshua L. Bandfield

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

The objective of this study was to identify and map possible source regions for all 5 known martian meteorite lithologies (basalt, lherzolite, clinopyroxenite, orthopyroxenite, and dunite) using data from the Mars Global Surveyor Thermal Emission Spectrometer (MGS TES). We deconvolved the TES data set using laboratory spectra of 6 martian meteorites (Los Angeles, Zagami, ALH A77005, Nakhla, ALH 84001, and Chassigny) as end members, along with atmospheric and surface spectra previously derived from TES data. Global maps (16 pixels/degree) of the distribution of each meteorite end member show that meteorite-like compositions are not present at or above TES detectability limits over most of the planet's dust-free regions. However, we have confidently identified local-scale (100s-1000s km2) concentrations of olivine- and orthopyroxene-bearing materials similar to ALH A77005, Chassigny, and ALH 84001 in Nili Fossac, in and near Ganges Chasma, in the Argyre and Hellas basin rims, and in Eos Chasma. Nakhla-like materials are identified near the detection limit throughout the eastern Valles Marineris region and portions of Syrtis Major. Basaltic shergottites were not detected in any spatially coherent areas at the scale of this study. Martian meteorite-like lithologies represent only a minor portion of the dust-free surface and, thus, are not representative of the bulk composition of the ancient crust. Meteorite-like spectral signatures identified above TES detectability limits in more spatially restricted areas (<tens of km) are targets of ongoing analysis.

Original languageEnglish (US)
Pages (from-to)871-885
Number of pages15
JournalMeteoritics and Planetary Science
Volume38
Issue number6
StatePublished - Jun 2003

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Allan Hills meteorite
SNC meteorites
Martian meteorite
Mars Global Surveyor
meteorites
thermal emission
mars
Mars
spectrometer
lithology
meteorite
spectrometers
shergottites
dust
dunite
spectral signatures
rims
olivine
basalt
planets

ASJC Scopus subject areas

  • Geophysics

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Searching for the source regions of martian meteorites using MGS TES : Integrating martian meteorites into the global distribution of igneous materials on Mars. / Hamilton, Victoria E.; Christensen, Philip; McSween, Harry Y.; Bandfield, Joshua L.

In: Meteoritics and Planetary Science, Vol. 38, No. 6, 06.2003, p. 871-885.

Research output: Contribution to journalArticle

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