Other
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998m%26ps...33..181m&link_type=abstract
Meteoritics & Planetary Science, vol. 33, no. 2, pages 181-189.
Other
18
Scientific paper
Antarctic meteorite QUE94201 is a new basaltic shergottite that is mainly composed of subequal amounts of maskelynite and pyroxenes (pigeonite and augite) plus abundant merrillite and accessory phases. It also contains impact melt. Complex zoning patterns in QUE94201 pyroxenes revealed by elemental map analyses using an electron microprobe suggest a crystallization sequence from Mg-rich pigeonite (En62Fs30Wo8) to extremely Fe-rich pigeonite (En5Fs81Wo14) via {110} Mg-rich augite bands (En44Fs20Wo36) in a single crystal. These textures, along with the abundant plagioclase (maskelynite), indicates single-stage rapid cooling (> 5 oC/yr) of this rock from a supercooled magma. Transition from Mg-rich augite to Fe-rich pigeonite reflects the onset of plagioclase crystallization. Enrichment of late-stage phases in QUE94201 implies crystallization from an evolved magma and suggests a different parent magma composition from the other basaltic shergottites. Lithology B of EETA79001 basaltic shergottite contains pyroxenes that show complex zoning with augite bands similar to those in QUE94201 pyroxene, suggesting similar one-stage rapid cooling. Lithology B of EETA79001 also resembles QUE94201 in its coarse-grained texture of silicates and its high abundance of maskelynite, although QUE94201 probably crystallized from a more fractionated magma. We also note that some Apollo lunar mare basalts (e.g., 12020 and 12021) have similar mineralogy and petrology to QUE94201, especially in pyroxene zoning. All these basaltic rocks with complex pyroxene zoning suggest rapid metastable crystallization from supercooled magmas.
McKay Gordon A.
Mikouchi Takashi
Miyamoto Masamichi
No associations
LandOfFree
Mineralogy of Antarctic basaltic shergottite QUE94201: Similarities to EETA7900 1 (Lithology B) martian meteorite does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mineralogy of Antarctic basaltic shergottite QUE94201: Similarities to EETA7900 1 (Lithology B) martian meteorite, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mineralogy of Antarctic basaltic shergottite QUE94201: Similarities to EETA7900 1 (Lithology B) martian meteorite will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-958460