Asuka 881757
WebSuch evidence has been found previously in lunar meteorites, such as high-pressure forms of silica in Asuka 881757 [Data Link from the Meteoritical Bulletin] by Eiji Ohtani (Tohoku University, Japan) and colleagues. But until recently, high-pressure polymorphs of silica had never been seen in any of the samples returned by the Apollo astronauts. WebAsuka-881757 is a coarse-grained (up to 8mm), holocrystalline, unbrecciated mare basalt with pyroxene and plagioclase as primary constituents (Supplementary Figs. 1 and 2), consistent with other
Asuka 881757
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WebAsuka-881757 is composed of large Fe-rich pyroxene and plagioclase grains with abundant hedenbergite + fayalite + silica mixtures. The pyroxene zoning and exsolu tion features of Asuka-881757 are similar to those of Los Angeles rather than QUE 94201. It is likely that Los Angeles and Asuka-881757 experienced similar crystalliza WebDec 27, 2010 · The BSE images of Asuka-881757 lunar meteorites. Two fragments, Asuka-881757-2 and 881757-3 were studied in this work. The amorphous silica grain, No. 1, in a …
Web40Ar-39Ar age determinations of lunar basalt meteorites Asuka 881757, Yamato 793169, Miller Range 05035, La Paz Icefield 02205, Northwest Africa 479, and basaltic breccia Elephant Moraine 96008 Vera A. FERNANDES1, 2*, Ray BURGESS2, and Adam MORRIS2 1Instituto Geofísico da Universidade de Coimbra, Av. Dias da Silva, 3000-134 Coimbra, … WebConsortium studies on lunar meteorites Yamato 793169 and Asuka 881757 (formerly Asuka-31) were performed to characterize these new samples from unknown locations …
http://www.psrd.hawaii.edu/CosmoSparks/July15/Apollo-sample-15299.html WebMar 27, 2010 · This age suggests that MIL 05035 could be paired with Asuka 881757, a low-Ti mare basalt meteorite. The magmatic event related to MIL 05035 was probably due to the late heavy impact bombardment on the moon around 3.9 Ga.
Asuka 881757 is compositionally and mineralogically similar to Yamato 793169, MIL 05035, and Ramlat Fasad 532 (Oman). All four were likely launched from the same crater on the Moon, probably along with breccia MET 01210.
WebDec 9, 2024 · Here we show the most depleted lunar meteorite, Asuka-881757, and associated mare basalts, represent ancient (~3.9 Ga) partial melts of KREEP-free Fe-rich mantle. Petrological modeling demonstrates that these basalts were generated at lower temperatures and shallower depths than typical Apollo mare basalts. © 2024. The … talbots 25% off saleWebJan 11, 2011 · N2 - Microcrystals of coesite and stishovite were discovered as inclusions in amorphous silica grains in shocked melt pockets of a lunar meteorite Asuka-881757 by … twitter mitomaWebJan 11, 2011 · In shocked lunar meteorite Asuka-881757, coesite crystals show a preferred orientation, and this was interpreted to have formed by solid-state transformation (Ohtani … talbots 2pc dress orange sleevelessWebAbstract–40Ar-39Ar data are presented for the unbrecciated lunar basaltic meteorites Asuka (A-) 881757, Yamato (Y-) 793169, Miller Range (MIL) 05035, LaPaz Icefield (LAP) … talbots3WebMay 31, 2024 · In addition, low Ti basaltic meteorites, Asuka 881757, Yamato793169, MIL 05035 and MET 01210 have yielded the oldest ages for basalt of this composition – 3.8 to 3.9 Ga (Fig. 8; Arai et al., 2008). Basilevsky et al. (2009) emphasize that the gaps in the ages of Apollo basalt groups disappear when the ages of meteoritic basalts are included … twitter mitrofanovWebBoth Asuka 881757 and Yamato 793169 show losses of radiogenic 4 He from U and Th decay and Yamato 793169 also 40 Ar loss from K-decay. For Asuka 881757, we calculate a K-Ar gas retention age of 3100 ± 600 Ma and a 244 Pu-136 Xe fission age of 4240 ± 170 Ma. This age is one of the oldest formation ages ever observed for a lunar basalt. talbots 25% offtwittermites mlp