QUE94201, a New Martian Meteorite that May Represent a Bulk Melt Rather than a Cumulate Fraction

Mathematics – Logic

Scientific paper

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Basalt, Mars, Meteorites: Snc, Rare Earth Elements, Shergottites

Scientific paper

QUE94201 is a new mafic achondrite dominated by pyroxene and plagioclase. Petrologic and geochemical analyses of a bulk chip (,16) and thin-section (,7) indicate the sample is a basaltic gabbro that is related to previously described basaltic and lherzolitic shergottites of suspected martian origin. However, unlike the cumulate fractions represented by other shergottites, QUE94201 is a plutonic rock that fractionally crystallized in what appears (petrographically) to be a closed system. QUE94201 contains more Fe-rich pyroxene and more bulk Al, Ti, and P than other shergottites, including lithology B of EETA79001, and thus appears to be more evolved. However, QUE94201 is also more LREE-depleted than other shergottites which suggests it has not assimilated as much of the LREE-enriched mantle component thought to have affected the compositions of other shergottites.

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