Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..879m&link_type=abstract
Lunar and Planetary Science, volume 27, page 879
Physics
5
Basalt: Mare, Cooling Rates, Pyroxene, Shergottite, Zoning: Chemical
Scientific paper
QUE94201 is a new Antarctic shergottite. Although its mineralogy is similar to previously known basaltic shergottites, QUE94201 (QUE) has distinct differences from them. QUE has larger grain sizes and contain abundant maskelynite, whitlockite and a wide impact melt vein enriched in P. The coarse-grained texture of pyroxene and maskelynite is similar to lunar meteorite Asuka881757. The largest difference of QUE from typical shergottites is pyroxene zoning trends which are very similar to pyroxenes of Apollo lunar mare basalts such as 12021. However, the low FeO/MnO ratio of pyroxene and existence of Na-rich maskelynite distinguish QUE from lunar basalts. Cooling rate calculations of pigeonite rim zoning constrain the cooling rate to be faster than 5 degrees C/yr (Burial depth: <30 m). This indicates the last stage of crystallization would occur in a shallow lava flow.
McKay Gordon A.
Mikouchi Takashi
Miyamoto Manabu
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