Mathematics – Logic
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.p51a..07w&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #P51A-07
Mathematics
Logic
5410 Composition, 5455 Origin And Evolution, 6215 Extraterrestrial Materials, 6225 Mars, 1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008)
Scientific paper
Currently, a small group of achondrites, comprising less than two dozen individual specimens, known as the "SNC" (Shergottite-Nakhlite-Chassignite) meteorites are the only samples of the Martian crust available to us for detailed laboratory analyses. These samples have been the focus of numerous petrologic, geochemical and isotopic investigations for more than two decades, particularly since the early 1980s when studies of the elemental and isotopic composition of trapped gases in one of these meteorites (EETA 79001) established that these rocks most likely originated on Mars. Since these rocks span an age range from 4.5 Ga to 180 Ma, their petrologic, geochemical and isotopic characteristics have the potential to provide "windows" into the evolution of the lithosphere, hydrosphere and atmosphere of Mars over geologic time. In this presentation I will highlight the results from some of the more recent studies that demonstrate the variety of constraints that have so far been obtained from the limited amount of Martian meteorite material available for study. Nevertheless, it is important to recognize that despite the insights gained about Mars from these samples, the very nature of these rocks places stringent limitations on the information that can be garnered from them. As meteorites, they lack geologic context and cannot be said to be a representative sample of the crust of Mars. Moreover, in certain instances, some of which will be discussed in the presentation, information inferred from the Martian meteorites appears to be at odds with that inferred from remote sensing spacecraft data. Martian sample return will be essential towards bridging the gap and reconciling apparent inconsistencies between laboratory studies of Martian meteorites and spacecraft observations and measurements.
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