Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..887m&link_type=abstract
Lunar and Planetary Science, volume 27, page 887
Other
5
Mars: Petrogenesis, Meteorites: Martian
Scientific paper
We have begun a geochemical study of the martian meteorites Governador Valadares and QUE 94201. As expected based on petrology, Governador Valadares is a typical martian clinopyroxenite, very similar in composition to Lafayette and Nakhla. Quite unexpectedly, the new martian meteorite QUE 94201 is unusual in composition. In general geochemical characteristics, it is most similar to EETA79001 lithology B. However, QUE 94201 exhibits more extreme geochemical fractionations. QUE 94201 is extremely LREE depleted, with La/Sm ~0.1 times CI, but shows little fractionation in the MREE to HREE (Sm/Yb ~0.7 times CI). QUE 94201 is enriched in the high field strength elements (HFSE), and has higher contents of P, Ti and Hf than any other martian meteorite yet found. Paradoxically, QUE 94201 is highly depleted in two other HFSE, Ta and Th. The extreme geochemical variations exhibited by martian basalts (EETA79001 lithologies A and B, QUE 94201, Shergotty and Zagami) are unusual by terrestrial standards, and suggest unusual petrogenetic processes on Mars.
Lindström Markus
Mittlefehldt Dave W.
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