Hydrogen and carbon isotopic ratios of polycyclic aromatic compounds in two CM2 carbonaceous chondrites and implications for prebiotic organic synthesis
Study of meteoritic organic compounds offers a unique opportunity to understand the origins of the organic matter in the early Solar System. Meteoritic polycyclic aromatic hydrocarbons (PAHs) and heteropolycyclic aromatic compounds (HACs) have been studied for over fifty years, however; their hydrog...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5009282 2023-05-15T14:02:24+02:00 Hydrogen and carbon isotopic ratios of polycyclic aromatic compounds in two CM2 carbonaceous chondrites and implications for prebiotic organic synthesis Huang, Y. Aponte, J. Zhao, J. Tarozo, R. Hallmann, C. 2015 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5009282 unknown info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2015.06.027 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5009282 Earth and Planetary Science Letters info:eu-repo/semantics/article 2015 ftgfzpotsdam https://doi.org/10.1016/j.epsl.2015.06.027 2022-09-14T05:57:59Z Study of meteoritic organic compounds offers a unique opportunity to understand the origins of the organic matter in the early Solar System. Meteoritic polycyclic aromatic hydrocarbons (PAHs) and heteropolycyclic aromatic compounds (HACs) have been studied for over fifty years, however; their hydrogen stable isotopic ratios (δD) have never been reported. Compound-specific δD measurements of PAHs and HACs are important, in part because the carbon isotopic ratios (δ13C) of various meteoritic PAHs cannot be readily distinguished from their terrestrial counterparts and it is difficult to rule out terrestrial contamination based on carbon isotopic ratios alone. In this study, we have extracted and identified more than sixty PAHs and HACs present in two CM2 carbonaceous chondrites Murchison and LON 94101. Their carbon and hydrogen stable isotopic ratios (δ13C and δD) were measured and used to discuss about their synthetic environments and formation mechanisms. The concentration of aromatic compounds is ∼30% higher in Murchison than in the Antarctic meteorite LON 94101, but both samples contained similar suites of PAHs and HACs. All PAHs and HACs found exhibited positive δD values (up to 1100‰) consistent with an extraterrestrial origin, indicating the relatively low δ13C values are indeed an inherent feature of the meteoritic aromatic compounds. The hydrogen isotopic data suggest aromatic compounds in carbonaceous chondrites were mainly formed in the cold interstellar environments. Molecular level variations in hydrogen and carbon isotopic values offer new insights to the formation pathways for the aromatic compounds in carbonaceous chondrites. Article in Journal/Newspaper Antarc* Antarctic GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic Murchison ENVELOPE(144.250,144.250,-67.317,-67.317) The Antarctic Earth and Planetary Science Letters 426 101 108 |
institution |
Open Polar |
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GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
description |
Study of meteoritic organic compounds offers a unique opportunity to understand the origins of the organic matter in the early Solar System. Meteoritic polycyclic aromatic hydrocarbons (PAHs) and heteropolycyclic aromatic compounds (HACs) have been studied for over fifty years, however; their hydrogen stable isotopic ratios (δD) have never been reported. Compound-specific δD measurements of PAHs and HACs are important, in part because the carbon isotopic ratios (δ13C) of various meteoritic PAHs cannot be readily distinguished from their terrestrial counterparts and it is difficult to rule out terrestrial contamination based on carbon isotopic ratios alone. In this study, we have extracted and identified more than sixty PAHs and HACs present in two CM2 carbonaceous chondrites Murchison and LON 94101. Their carbon and hydrogen stable isotopic ratios (δ13C and δD) were measured and used to discuss about their synthetic environments and formation mechanisms. The concentration of aromatic compounds is ∼30% higher in Murchison than in the Antarctic meteorite LON 94101, but both samples contained similar suites of PAHs and HACs. All PAHs and HACs found exhibited positive δD values (up to 1100‰) consistent with an extraterrestrial origin, indicating the relatively low δ13C values are indeed an inherent feature of the meteoritic aromatic compounds. The hydrogen isotopic data suggest aromatic compounds in carbonaceous chondrites were mainly formed in the cold interstellar environments. Molecular level variations in hydrogen and carbon isotopic values offer new insights to the formation pathways for the aromatic compounds in carbonaceous chondrites. |
format |
Article in Journal/Newspaper |
author |
Huang, Y. Aponte, J. Zhao, J. Tarozo, R. Hallmann, C. |
spellingShingle |
Huang, Y. Aponte, J. Zhao, J. Tarozo, R. Hallmann, C. Hydrogen and carbon isotopic ratios of polycyclic aromatic compounds in two CM2 carbonaceous chondrites and implications for prebiotic organic synthesis |
author_facet |
Huang, Y. Aponte, J. Zhao, J. Tarozo, R. Hallmann, C. |
author_sort |
Huang, Y. |
title |
Hydrogen and carbon isotopic ratios of polycyclic aromatic compounds in two CM2 carbonaceous chondrites and implications for prebiotic organic synthesis |
title_short |
Hydrogen and carbon isotopic ratios of polycyclic aromatic compounds in two CM2 carbonaceous chondrites and implications for prebiotic organic synthesis |
title_full |
Hydrogen and carbon isotopic ratios of polycyclic aromatic compounds in two CM2 carbonaceous chondrites and implications for prebiotic organic synthesis |
title_fullStr |
Hydrogen and carbon isotopic ratios of polycyclic aromatic compounds in two CM2 carbonaceous chondrites and implications for prebiotic organic synthesis |
title_full_unstemmed |
Hydrogen and carbon isotopic ratios of polycyclic aromatic compounds in two CM2 carbonaceous chondrites and implications for prebiotic organic synthesis |
title_sort |
hydrogen and carbon isotopic ratios of polycyclic aromatic compounds in two cm2 carbonaceous chondrites and implications for prebiotic organic synthesis |
publishDate |
2015 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5009282 |
long_lat |
ENVELOPE(144.250,144.250,-67.317,-67.317) |
geographic |
Antarctic Murchison The Antarctic |
geographic_facet |
Antarctic Murchison The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Earth and Planetary Science Letters |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2015.06.027 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5009282 |
op_doi |
https://doi.org/10.1016/j.epsl.2015.06.027 |
container_title |
Earth and Planetary Science Letters |
container_volume |
426 |
container_start_page |
101 |
op_container_end_page |
108 |
_version_ |
1766272662984720384 |