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dc.contributor.authorPizzarello, Sandra
dc.contributor.authorHuang, Yongsong
dc.date.accessioned2021-02-12T20:55:33Z
dc.date.available2021-02-12T20:55:33Z
dc.date.issued2002-01-01
dc.identifier.citationPizzarello, S., & Huang, Y. (2002). Molecular and isotopic analyses of Tagish Lake alkyl dicarboxylic acids. Meteoritics & Planetary Science, 37(5), 687-696.
dc.identifier.issn1945-5100
dc.identifier.doi10.1111/j.1945-5100.2002.tb00848.x
dc.identifier.urihttp://hdl.handle.net/10150/655516
dc.description.abstractThe Tagish Lake meteorite soluble organic suite has a general composition that differs from those of both CI- and CM chondrites. These differences suggest that distinct processes may have been involved in the formation of different groups of organics in meteorites. Tagish Lake alkyl dicarboxylic acids have a varied, abundant distribution and are, with carboxylated pyridines, the only compounds to have an occurrence comparable to that of the Murchison meteorite. This study has undertaken their molecular and isotopic characterization, with the aim to understand their origin and to gain insights into the evolutionary history of the meteorite parent body. Tagish Lake alkyl dicarboxylic acids are present as a homologous series of saturated and unsaturated species with three through ten-carbon atom chain length. Linear saturated acids are predominant and show decreasing amounts with increasing chain length. A total of forty-four of these compounds were detected with the most abundant, succinic acid, present at ~40 nmoles/g. met. Overall the molecular distribution of Tagish Lake dicarboxylic acids shows a remarkable compound to compound correspondence with those observed in the Murchison and Murray meteorites. In both Tagish Lake and Murchison, the imides of the more abundant dicarboxylic acids were also observed. All delta-D and delta-13C values for Tagish Lake acids are positive and show a substantial isotopic enrichment. delta-D values vary from, approximately, +1120 ppm for succinic acid to +1530 ppm for methyl glutaric acid. delta-13C values ranged from +12.6 ppm for methyl glutaric acid to +22.9 ppm for glutaric acid, with adipic acid having a significantly lower value (+5.5 ppm). Murchison dicarboxylic acid showed similar isotopic values: their delta-13C values were generaly higher by an average 17% and delta-D values were lower for succinic and glutaric acids, possibly due to contamination. The molecular and isotopic data collected for these compounds restrict their possible origin to processes, either interstellar or of very cold nebular regions, that produced significant isotopic enrichments. Saturated or partially unsaturated nitriles and dinitriles appear to be good precursor candidates as their hydrolysis, upon water exposure, would produce dicarboxylic acids and other carboxylated species found in Tagish Lake. This evolutionary course could possibly include pre-accretionary processes.
dc.language.isoen
dc.publisherThe Meteoritical Society
dc.relation.urlhttps://meteoritical.org/
dc.rightsCopyright © The Meteoritical Society
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectsoluble meteoritic compounds
dc.subjectInsoluble organic material
dc.subjecthydrothermal treatment
dc.titleMolecular and isotopic analyses of Tagish Lake alkyl dicarboxylic acids
dc.typeArticle
dc.typetext
dc.identifier.journalMeteoritics & Planetary Science
dc.description.collectioninformationThe Meteoritics & Planetary Science archives are made available by the Meteoritical Society and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume37
dc.source.issue5
dc.source.beginpage687
dc.source.endpage696
refterms.dateFOA2021-02-12T20:55:33Z


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