Similarities in zoning of pyroxenes from QUE94201 and EETA79001 Martian meteorites

Details Similarities in zoning of pyroxenes from QUE94201 and EETA79001 Martian meteorites Similarities in zoning of pyroxenes from QUE94201 and EETA79001 Martian meteorites

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..955m&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 955.

Computer Science

1

Pyroxenes, Mars Atmosphere, Meteorites, Magnesium, X Ray Analysis

Scientific paper

Complex zoning of minerals is often observed in volcanic rocks and experimental products, and is considered to be produced by crystal growth. QUE94201, a recently discovered basaltic shergottite, contains coarse-grained, complexly-zoned crystals of pyroxene. The QUE94201 pyroxene is zoned from Mg-rich pigeonite cores through an intermediate zone of Mg-rich augite and then to extremely Fe-rich pigeonite rims. This unique zoning of pyroxene has been reported from Apollo lunar mare basalts; however, no similar zoning of pyroxene has been reported from Martian meteorites. We have surveyed pyroxenes of Martian meteorites, especially shergottites using an elemental mapping technique by JEOL JXA8900L electron microprobe, and found that pyroxenes from lithology B of EETA79001 show similar complex zoning to QUE94201 pyroxenes. Zoning of this type has not been detected from pyroxenes in Zagami, ALH77005, LEW88516, and Y793605. The affinity of zoning pattern and chemical composition between QUE94201 and EETA79001B pyroxenes indicate similar crystallization condition of these shergottites, although QUE94201 is more enriched in late-crystallized phases.

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