Enrichment of deuterium in insoluble organic matter from primitive meteorites: A solar system origin?

Rémusat, Laurent; Palhol, Fabien; Robert, François; Derenne, Sylvie; France‐Lanord, Christian

doi:10.1016/j.epsl.2005.12.010

Cited by 116 publications

(153 citation statements)

References 29 publications

Supporting

Mentioning

137

Contrasting

Unclassified

Order By: Relevance

“…Alternatively, cold chemistry in the outer regions of the protoplanetary disk could be responsible for such enrichments. The negative correlation between the D/H ratios of the CH bonds and their binding energy in the Insoluble Organic Matter of Orgueil carbonaceous meteorite also suggests that deuterium enrichments could have been acquired within the protoplanetary disk itself (Remusat et al 2006). Whether this mechanism affected the D-fractionation observed in cometary HCN and H 2 O has still to be investigated.…”

Section: Deuteration In the Solar Nebulamentioning

confidence: 99%

Cometary Isotopic Measurements

et al. 2015

View full text Add to dashboard Cite

Section: Deuteration In the Solar Nebulamentioning

confidence: 99%

Cometary Isotopic Measurements

et al. 2015

View full text Add to dashboard Cite

“…The distribution of the deuterium has also been studied at the molecular scale [61,62]. A relation between the C-H bond dissociation energy and the D/H ratio has been revealed in Orgueil IOM [62]. In addition, radicals in the IOM of Orgueil are extremely D-rich: D/H = 15000 ± 5000×10 -6 ; δD = 95300‰ [63].…”

Section: Water In Chondritesmentioning

confidence: 99%

“…CO, CV [60] pointing out to their thermal sensitivity. The distribution of the deuterium has also been studied at the molecular scale [61,62]. A relation between the C-H bond dissociation energy and the D/H ratio has been revealed in Orgueil IOM [62].…”

Section: Water In Chondritesmentioning

confidence: 99%

“…Moreover the D is heterogeneously distributed between and within the samples, at the micron and the molecular scales. The interpretation of the D/H ratio in the IOMs of carbonaceous chondrites remains very speculative: it has been attributed to interstellar [55,57], nebular [62] or parent body processes [51]! This issue results from the superimposition of synthesis reactions (primary process) and the following modifications (secondary processes) that could affect the isotopic record of IOM in the gas phase or on the parent body.…”

Section: D/h Ratio Heterogeneities In the Iommentioning

confidence: 99%

See 1 more Smart Citation

Organic material in meteorites and the link to the origin of life

Rémusat

2014

BIO Web of Conferences

View full text Add to dashboard Cite

Abstract. Life requires specific conditions that have been, so far, only proven to meet on Earth. Though the chemical elements required to form living organism (C, H, N, O, S, etc) are widespread in the universe, the molecules that are crucial for Life, like nucleobases or amino acids, may not be so ubiquitous. The question of the formation of small and complex molecules is highly relevant to understand the process of Life origin. Carbonaceous chondrites are a class of meteorites rich in organic compounds and host potential precursors for the emergence of Life (organic matter and water). They could have been the source of complex molecules on the early Earth. This contribution will describe the main properties of the organic matter recovered from carbonaceous chondrites. However, the isotopic and molecular record of organic compounds is faded by secondary processes that occurred on the parent body of these meteorites. This results in complex signatures that raise multiple questions about the origin of organic compounds in the Solar System.

show abstract

“…Such materials were found to have D/H ratios higher than the SMOW, ranging from moderate excess (1-3× in Stardust samples) to extreme D enrichments (10-30× in UCAMMs, even up to 50× in CPIDPs) (Messenger 2000; Brownlee et al 2004;McKeegan et al 2006;Duprat et al 2010). Given other surface enrichment mechanisms for Solar objects, e.g., spallation reactions (Stephant & Robert 2014), it appears plausible that the 67P crust and dust surfaces contain excess D, bonded directly to primitive organics (Remusat et al 2006) or in hydroxyl groups in silicates (Mahaffy et al 2015). These D reservoirs may be tapped by energetic H 2 O + ions to produce deuterated water species, thus enriching the coma.…”

Section: Energetic Water Ions and Deuterium-enriched Cometary Mattermentioning

confidence: 99%

Dynamic Deuterium Enrichment in Cometary Water via Eley–rideal Reactions

Yao

Giapis

2017

ApJ

View full text Add to dashboard Cite

The deuterium-to-hydrogen ratio (D/H) in water found in the coma of Jupiter family comet (JFC) 67P/ Churyumov-Gerasimenko was reported to be (5.3±0.7)×10 −4 , the highest among comets and three times the value for other JFCs with an ocean-like ratio. This discrepancy suggests the diverse origins of JFCs and clouds the issue of the origin of Earth's oceanic water. Here we demonstrate that Eley-Rideal reactions between accelerated water ions and deuterated cometary surface analogs can lead to instantaneous deuterium enrichment in water scattered from the surface. The reaction proceeds with H 2 O + abstracting adsorbed D atoms, forming an excited H 2 DO * state, which dissociates subsequently to produce energetic HDO. Hydronium ions are also produced readily by the abstraction of H atoms, consistent with H 3 O + detection and abundance in various comets. Experiments with water isotopologs and kinematic analysis on deuterated platinum surfaces confirmed the dynamic abstraction mechanism. The instantaneous fractionation process is independent of the surface temperature and may operate on the surface of cometary nuclei or dust grains, composed of deuterium-rich silicates and carbonaceous chondrites. The requisite energetic water ions have been detected in the coma of 67P in two populations. This dynamic fractionation process may temporarily increase the water D/H ratio, especially as the comet gets closer to the Sun. The magnitude of the effect depends on the water ion energy-flux and the deuterium content of the exposed cometary surfaces.

show abstract

Enrichment of deuterium in insoluble organic matter from primitive meteorites: A solar system origin?

Cited by 116 publications

References 29 publications

Cometary Isotopic Measurements

Cometary Isotopic Measurements

Organic material in meteorites and the link to the origin of life

Dynamic Deuterium Enrichment in Cometary Water via Eley–rideal Reactions

Contact Info

Product

Resources

About