 | | Journal (article/letter/editorial) | | Crystallization conditions of Los Angeles, a basaltic Martian meteorite DIMITRIOS XIROUCHAKIS,1,* DAVID S. DRAPER...Fe-rich clinopyroxene exsolved to augite and pigeonite. Initial appearance of titanomagnetite probably...pyroxene exsolution, thus producing assemblages of pigeonite, titanomagnetite, olivine, ilmenite, and augite...shocked plagioclase, and the breakdown of Fe-rich pigeonite compositions to olivine⫹augite⫹silica below 900...minerals in Los Angeles and other similar basaltic Martian meteorites can control the T-fO2 equilibration |  | | Journal (article/letter/editorial) | | accepted in revised form February 21, 2003) Abstract—Martian meteorites Sayh al Uhaymir (SaU) 005 and lithology...finer-grained groundmasses consisting principally of pigeonite (⬃50% in SaU 005; ⬃60% in EET-A), plagioclase...basalts. (3) The CSD function for groundmass pigeonite in EET-A indicates continuous nucleation and growth...crystallization. This is supported by: (1) high pigeonite/plagioclase ratios; (2) low augite contents; and...and Treiman, 1998). However, recently discovered Martian meteorites include olivinephyric basalts (Table |  | | Journal (article/letter/editorial) | | (Dhofar 007) and noncumulated (NWA 011). Results: A meteorite shower, 37 pieces weighing a total of 21,270 g...(~0.5). Pyroxene is presented as two phases: pigeonite (FS~~-*, Wo3-'J and augite (FS=-~~. The ratio...metagabbroitic structure consisting of subhedral grains of pigeonite (0.5-0.6 mm) and plagioclase (0.05-0.1 mm). Accessories...Pyroxene is also presented here as two phases: pigeonite (Fs,-,, WO,~ and augite (Fs43-50.Wo30-38).The...in the range of cumulated eucrites; the REE pattern supports a cumulate type of this meteorite also. At |
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