Arid
DOI10.1111/j.1945-5100.2011.01257.x
Heterogeneous distributions of amino acids provide evidence of multiple sources within the Almahata Sitta parent body, asteroid 2008 TC3
Burton, Aaron S.1; Glavin, Daniel P.1; Callahan, Michael P.1; Dworkin, Jason P.1; Jenniskens, Peter2; Shaddad, Muawia H.3
通讯作者Burton, Aaron S.
来源期刊METEORITICS & PLANETARY SCIENCE
ISSN1086-9379
出版年2011
卷号46期号:11页码:1703-1712
英文摘要

Two new fragments of the Almahata Sitta meteorite and a sample of sand from the related strewn field in the Nubian Desert, Sudan, were analyzed for two to six carbon aliphatic primary amino acids by ultrahigh performance liquid chromatography with UV-fluorescence detection and time-of-flight mass spectrometry (LC-FT/ToF-MS). The distribution of amino acids in fragment #25, an H5 ordinary chondrite, and fragment #27, a polymict ureilite, were compared with results from the previously analyzed fragment #4, also a polymict ureilite. All three meteorite fragments contain 180-270 parts-per-billion (ppb) of amino acids, roughly 1000-fold lower than the total amino acid abundance of the Murchison carbonaceous chondrite. All of the Almahata Sitta fragments analyzed have amino acid distributions that differ from the Nubian Desert sand, which primarily contains L-alpha-amino acids. In addition, the meteorites contain several amino acids that were not detected in the sand, indicating that many of the amino acids are extraterrestrial in origin. Despite their petrological differences, meteorite fragments #25 and #27 contain similar amino acid compositions; however, the distribution of amino acids in fragment #27 was distinct from those in fragment #4, even though both are polymict ureilites from the same parent body. Unlike in CM2 and CR2/3 meteorites, there are low relative abundances of alpha-amino acids in the Almahata Sitta meteorite fragments, which suggest that Strecker-type chemistry was not a significant amino acid formation mechanism. Given the high temperatures that asteroid 2008 TC3 appears to have experienced and lack of evidence for aqueous alteration on the asteroid, it is possible that the extraterrestrial amino acids detected in Almahata Sitta were formed by Fischer-Tropsch/Haber-Bosch type gas-grain reactions at elevated temperatures.


类型Article
语种英语
国家USA ; Sudan
收录类别SCI-E
WOS记录号WOS:000297414600007
WOS关键词POLYCYCLIC AROMATIC-HYDROCARBONS ; MURCHISON METEORITE ; ISOTOPE COMPOSITION ; ORDINARY CHONDRITE ; ORGANIC-COMPOUNDS ; ENRICHMENT ; RECOVERY ; UREILITE ; SAMPLES ; BODIES
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/169649
作者单位1.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA;
2.SETI Inst, Carl Sagan Ctr, Mountain View, CA 94043 USA;
3.Univ Khartoum, Dept Phys, Khartoum 11115, Sudan
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Burton, Aaron S.,Glavin, Daniel P.,Callahan, Michael P.,et al. Heterogeneous distributions of amino acids provide evidence of multiple sources within the Almahata Sitta parent body, asteroid 2008 TC3[J],2011,46(11):1703-1712.
APA Burton, Aaron S.,Glavin, Daniel P.,Callahan, Michael P.,Dworkin, Jason P.,Jenniskens, Peter,&Shaddad, Muawia H..(2011).Heterogeneous distributions of amino acids provide evidence of multiple sources within the Almahata Sitta parent body, asteroid 2008 TC3.METEORITICS & PLANETARY SCIENCE,46(11),1703-1712.
MLA Burton, Aaron S.,et al."Heterogeneous distributions of amino acids provide evidence of multiple sources within the Almahata Sitta parent body, asteroid 2008 TC3".METEORITICS & PLANETARY SCIENCE 46.11(2011):1703-1712.
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