Mathematics – Logic
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002usnc.conf...25j&link_type=abstract
Unmixing the SNCs: Chemical, Isotopic, and Petrologic Components of the Martian Meteorites, p. 25-26
Mathematics
Logic
Chemical Composition, Snc Meteorites, Radioactive Isotopes, Shergottites, Geochronology, Chemical Fractionation, Lunar Rocks, Basalt, Rubidium, Strontium, Crystallization
Scientific paper
Ten years ago we had 7 SNC meteorites while today we have 26 SNC meteorites. The newly found SNC's are essentially duplicates of the previously ones with some slight variations in their chemical composition. It seems that there are only a limited number of lithologies present on the SNC parent body, and we have already sampled the prominent lithologies. For many years the 'ages' of SNC meteorites have been under discussion. The 150 Ma to 500 Ma mineral ages for shergotites will be called the young or 180 Ma event, and will be the main focus in this contribution. Nyquist argued that the 180 Ma event might represent the age of crystallization. Indeed we have good evidence that some mineral equilibration took place at this time since in some cases Rb-Sr and Sm-Nd systematics give the same age. However, the conclusion that shergotites are magmatic rocks that were erupted at this time is not substantiated by data. To the contrary there is good evidence that a chemical fractionation, which is typical for magmatic rocks (Rb- Sr fractionation), was not associated with the young disturbance. Instead we find chemical fractionation patterns (Sm-Nd fractionation) that are not observed in any basalts.
Dreibus Gerlind
Jagoutz Emil
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