organic matter

Eau dans les différentes chondrites carbonées / Water in the different carbonaceous chondrites

Piani L., Marrocchi Y., Vacher L. G., Yurimoto H., Bizzarro M. (2020) Origin of hydrogen isotopic variations in chondritic water and organics. Earth and Planetary Science Letters, Vol. 567, 117008. doi.org/10.1016/j.epsl.2021.117008

Dans ce nouveau papier paru en ligne en mai dans la revue EPSL, nous avons utilisé la méthode de mesure in situ en sonde ionique « D/H vs. C/H » (Piani et al. 2018, Nat. Astro.) pour estimer la composition isotopique de l’eau de nombreuses chondrites carbonées (CM, CI, CO, CR, ungrouped). Nous montrons que les variations D/H observées ne sont pas le résultats de processus secondaires sur le corps parent astéroïdal et proposons un modèle pour expliquer la distribution du D/H de l’eau et de la matière organique au moment de la formation de ces différentes chondrites.

In this recent paper published in EPSL, we report the in situ determination of the water D/H ratio in different types of carbonaceous chondrites (CM, CI, CO, CR, ungrouped) using a method recently developed on SIMS (Piani et al. 2018, Nat. Astro). We show that the D/H variations of water and organics in the different chondrite types are not the result of parent body processes and we propose a model to explain these distribution in the disk at the time and place of the chondrite parent formation.

D/H ratios of water in different carbonaceous chondrites: distinct and unique values are found for each chondrite type

Geochemical Journal special issue on the Evolution of Molecules in Space

A special issue of Geochemical Journal on the Evolution of Molecules in Space has just been published online! This issue has been proposed after the 3S symposium and linked to the Japanese Grant-in-aid of MEXT named Evolution of Molecules in Space and led by Akira Kouchi and Shogo Tachibana.

The issue was coordinated by five associate editors: Akira Kouchi, Shogo Tachibana, Laurette Piani, François-Régis Orthous-Daunay and Hiroshi Naraoka and gathered seven open-access publications.