Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 115, Issue 34, Pages 8535-8540Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1808101115
Keywords
carbonaceous chondrites; organic matter; oxygen isotopes; protosolar nebula; secondary ion mass spectrometry
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Funding
- European Research Council Grant PaleoNanoLife [290861]
- Agence Nationale de la Recherche Grant CRADLE [ANR-15-CE31-0004-01]
- UK Science and Technology Facilities Council [ST/M001253/1, ST/P005225/1]
- UK Research Partnership Investment Funding Manchester Research Partnership Investment Funding Round 2
- EPSRC [EP/P025021/1] Funding Source: UKRI
- STFC [ST/M001253/1, ST/P005225/1] Funding Source: UKRI
- European Research Council (ERC) [290861] Funding Source: European Research Council (ERC)
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Dust grains of organic matter were the main reservoir of C and N in the forming Solar System and are thus considered to be an essential ingredient for the emergence of life. However, the physical environment and the chemical mechanisms at the origin of these organic grains are still highly debated. In this study, we report high-precision triple oxygen isotope composition for insoluble organic matter isolated from three emblematic carbonaceous chondrites, Orgueil, Murchison, and Cold Bokkeveld. These results suggest that the O isotope composition of carbonaceous chondrite insoluble organic matter falls on a slope 1 correlation line in the triple oxygen isotope diagram. The lack of detectable mass-dependent O isotopic fractionation, indicated by the slope 1 line, suggests that the bulk of carbonaceous chondrite organics did not form on asteroidal parent bodies during low-temperature hydrothermal events. On the other hand, these O isotope data, together with the H and N isotope characteristics of insoluble organic matter, may indicate that parent bodies of different carbonaceous chondrite types largely accreted organics formed locally in the protosolar nebula, possibly by photochemical dissociation of C-rich precursors.
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