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Origin of hydrogen isotopic variations in chondritic water and organics

Abstract : Chondrites are rocky fragments of asteroids that formed at different times and heliocentric distances in the early solar system. Most chondrite groups contain water-bearing minerals, attesting that both water-ice and dust were accreted on their parent asteroids. Nonetheless, the hydrogen isotopic composition (D/H) of water in the different chondrite groups remains poorly constrained, due to the intimate mixture of hydrated minerals and organic compounds, the other main H-bearing phase in chondrites. Building on our recent works using in situ secondary ion mass spectrometry analyses, we determined the H isotopic composition of water in a large set of chondritic samples (CI, CM, CO, CR, CY, and C-ungrouped carbonaceous chondrites) and report that water in each group shows a distinct and unique D/H signature. Based on a comparison with literature data on bulk chondrites and their water and organics, our data do not support a preponderant role of parent-body processes in controlling the D/H variations among chondrites. Instead, we propose that the water and organic D/H signatures were mostly shaped by interactions between the protoplanetary disk and the molecular cloud that episodically fed the disk over several million years. Because the 2 preservation of D-rich interstellar water and/or organics in chondritic materials is only possible below their respective sublimation temperatures (160 and 350-450 K), the H isotopic signatures of chondritic materials depend on both the timing and location at which their parent body formed.
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Submitted on : Saturday, May 22, 2021 - 11:22:27 PM
Last modification on : Wednesday, August 25, 2021 - 3:28:33 AM
Long-term archiving on: : Monday, August 23, 2021 - 6:12:32 PM

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Laurette Piani, Yves Marrocchi, Lionel Vacher, Hisayoshi Yurimoto, Martin Bizzarro. Origin of hydrogen isotopic variations in chondritic water and organics. Earth and Planetary Science Letters, Elsevier, 2021, 567, pp.117008. ⟨10.1016/j.epsl.2021.117008⟩. ⟨hal-03232950⟩

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