The deuterium/hydrogen distribution in chondritic organic matter attests to early ionizing irradiation.

Abstract:

:Primitive carbonaceous chondrites contain a large array of organic compounds dominated by insoluble organic matter (IOM). A striking feature of this IOM is the systematic enrichment in deuterium compared with the solar hydrogen reservoir. This enrichment has been taken as a sign of low-temperature ion-molecule or gas-grain reactions. However, the extent to which Solar System processes, especially ionizing radiation, can affect D/H ratios is largely unknown. Here, we report the effects of electron irradiation on the hydrogen isotopic composition of organic precursors containing different functional groups. From an initial terrestrial composition, overall D-enrichments and differential intramolecular fractionations comparable with those measured in the Orgueil meteorite were induced. Therefore, ionizing radiation can quantitatively explain the deuteration of organics in some carbonaceous chondrites. For these meteorites, the precursors of the IOM may have had the same isotopic composition as the main water reservoirs of the inner Solar System.

journal_name

Nat Commun

journal_title

Nature communications

authors

Laurent B,Roskosz M,Remusat L,Robert F,Leroux H,Vezin H,Depecker C,Nuns N,Lefebvre JM

doi

10.1038/ncomms9567

subject

Has Abstract

pub_date

2015-10-13 00:00:00

pages

8567

issn

2041-1723

pii

ncomms9567

journal_volume

6

pub_type

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