Meteorite Yamato

Eugster O., Michel Th., and Niedermann S. (1992) Solar wind and cosmic ray exposure history of lunar meteorite Yamato-793274. Proc. NIPR Symp. Antarct. Meteorit. 5, 23-35. 

Nishiizumi K., Arnold J. R., Klein J., Fink D., Middleton R., Sharma P., and Kubik P. W. (1991b) Cosmic ray exposure history of lunar meteorite Yamato 793274. In 16th Symp. Antarctic Meteorites. Natl. Inst. Polar Res., Tokyo, Japan, pp. 188-191. 

Ostertag R., Stoffler D., Bischoff A., Palme H., Schultz L., Spettel B., Weber H., Weekwerth G., and Wanke H. (1986) Lunar Meteorite Yamato-791197 Petrography, shock history and chemical composition. Mem. Natl. Inst. Polar. Res. (Tokyo), Spec. Issue 41, 17-44. 

Takahashi K, Masuda A (1987) Two lunar meteorites Yamato 791197 and Yamato 82192 REE abundances and geochrono-logical dating. Mem. Natl. Inst. Polar Res., Special Issue 46 71-88... 

Essentially the same amino acids, and nearly equal quantities of D and L enantiomers, were detected in the Murray meteorite, another type II carbonaceous chondrite [6]. Recent expeditions to Antarctica have returned with a large number of meteorites, many of which are carbonaceous chondrites. These may have been protected from terrestrial contamination by the pristine Antarctic ice. Careful analysis of two of these, the Yamato (74662) and the Allan Hills (77306), both type II carbonaceous chondrites, by ion exchange chromatography, gas chromatography, and GC/MS, have detected a wide variety of both protein and non-protein amino acids in approximately equal D and L abundances [9,10]. Fifteen amino acids were detected in the Yamato meteorite and twenty in the Allan Hills, the most abundant being glycine and alanine. The amino acid content of the Yamato meteorite is comparable with that of the Murchison and Murray, but the Allan Hills contains 1/5 to 1/10 that quantity. Unlike earlier meteorites from other locations, the quantities of amino acids in the exterior and interior portions of the Yamato and Allan Hills meteorites are almost identical [9,10]. Thus, these samples may have been preserved without contamination since their fall in the blue ice of Antarctica, which js 250,000 years old in the region of collection. 

Ouri, Y., Shirari, N. and Ebihara, M. (2003) Chemical composition of Yamato (Y)980459 and Y000749 Neutron-induced prompt gamma-ray analysis study. Antarctic Meteorite Research, 16, 80—93. 

The ungrouped meteorites Belgica-7904, Yamato-86720, Yamato-82162, and Dhofar-225 have petrographic, mineralogical, and chemical affinities to the CM and Cl carbonaceous chondrites (e.g., Tomeoka et al., 1989 Tomeoka,... 

Bischoff A. and Metzler K. (1991) Mineralogy and petrography of the anomalous carbonaceous chondrites Yamato-86720, Yamato-82162, and Belgica-7904. Proc. NIPR Symp. Antarct. Meteorit. 4, 226-246. 

Tomeoka K., KojimaH., and YanaiK. (1989) Yamato-86720 a CM carbonaceous chondrite having experienced extensive aqueous alteration and thermal metamorphism. Proc. NIPR Symp. Antarct. Meteorit. 2, 55—74. 

Tomeoka K., Nomura K., and Takeda H. (1992) Na-bearing Ca—Al-rich inclusions in the Yamato-791717 CO carbonaceous chondrite. Meteoritics 27, 136—143. 

Hiyagon H. and Hashimoto A. (1999b) An ion microprobe study of oxygen isotopes in various types of inclusions in Yamato-791717 (C03) chondrite oxygen isotopes vs. fayalite content in ohvine. Symp. Antarct. Meteorit. 24, 37-39. 

Kimura M., Hiyagon H., Palme H., Spettel B., Wolf D., Clayton R. N., Mayeda T. K., Sato T., Suzuki A., and Kojima H. (2002) Yamato 792947, 793408 and 82038 the most primitive H chondrites, with abundant refractory inclusions. Meteorit. Planet. Sci. 37, 1417—1434. 

H. (2002) Yamato 79247, 79348 aud 82038 the most primitive H chondrites, with abundant refractory inclusions. Meteorit. Planet. Sci. 37, 1417-1434. 

Ichikawa O. and Ikeda Y. (1995) Petrology of the Yamato-8449 CR chondrite. Proc. NIPR Symp. Antarct Meteorit. 8, 63-78. 

Nagahara H. and Ozawa K. (1986) Petrology of Yamato-791493, lodranite melting, crystallization, cooling history, and relationship to other meteorites. Mem. NIPR Spec. Issue 41, 181- 205. 

Pyroxene pallasites are represented by only two members Vermillion and Yamato 8451. The two meteorites share the common feature of containing pyroxene, but differ substantially from one another. Yamato 8451 consists of —60% ohvine, 35% metal, 2% pyroxene, and 1% troihte (Hiroi et al., 1993 Yanai and Kojima, 1995). In contrast, Vermillion contains around 14% olivine, and less than 1% each of orthopyroxene, chromite, and phosphates (Boesenberg et al., 2000). The iron concentration in olivine (Fogg 9o) is similar to main group pallasites, although pyroxene pallasites have lower Fe/Mn ratios (Mittlefehldt et al., 1998). The two pyroxene pallasites do not share a common metal composition with each other or, in detail, with other pallasites (Wasson et al., 1998). 

Nagao K., Nakamura T., Miura Y. N., and Takaoka N. (1997) Noble gases and mineralogy of primary igneous materials of the Yamato-793605 shergottite. Antarct. Meteorit. Res. 10, 125-142. 

N. (1998) Two-stage irradiation of the Yamato 793605 Martian meteorite. Meteorit. Planet. Sci. 33, A114. 

Nishiizumi K. and Caffee M. (1997) Exposure history of shergottite Yamato 793605. Antarct. Meteorit. XXII, 149-151. 

Takaoka N. and Yoshida Y. (1992) Noble gases in Yamato-793274 and 86032 lunar meteorites. Proc. Natl. Inst. Polar Res. Symp. Antarct. Meteorit. 5, 36-48. 

Terribilini D., Eugster O., Burger M., Jakob A., and Krahenbiihl U. (1998) Noble gases and chemical composition of Shergotty mineral fractions, Chassigny and Yamato 793605 the trapped argon-40/argon-36 ratio and ejection times of Martian meteorites. Meteorit. Planet. Set 33, 677 -684. 

Thalmann C., Eugster O., Herzog G. F., Klein J., Krahenbiihl U., Vogt S., and Xue S. (1996) History of lunar meteorites Queen Alexandra Range 93069, Asuka 881757 and Yamato 793169 based on noble gas isotopic abundances, radionuclide concentrations and chemical composition. Meteorit. Planet. Sci. 31, 857-868. 

Vogt S., Herzog G. F., Fink D., Klein J., Middleton R., Dockhorn B., Korschinek G., and Nolte E. (1991) Exposure histories of the lunar meteorites MacAlpine Hills 88104, MacAlpine Hills 88105, Yamato 791197 and Yamato 86032. Geochim. Cosmochim. Acta 55, 3157-3165. 

Chondrules that have been analyzed from the some of the most pristine meteorites (e.g., Semarkona, Bishunpur, Yamato 81020) tend to show detectable Mg excesses that imply... 

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