Experimental investigation of Fe-clay/organic interactions under asteroidal conditions

Viennet, Jean‐Christophe; Guillou, C. Le; Rémusat, Laurent; Baron, Fabien; Delbes, Ludovic; Blanchenet, Anne-Marie; Laurent, Boris; Criouet, Isis; Bernard, Sylvain

doi:10.1016/j.gca.2021.12.002

Cited by 10 publications

(4 citation statements)

References 90 publications

(157 reference statements)

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“…In mass balance calculations, organic concentrations and D/H compositions are generally measured after solvent extraction (Yamashita & Naraoka 2014) or chemical isolation from minerals (Alexander et al 2007). However, about half of the total organic matter might not be accessible with these techniques (Alexander et al 2015;Viennet et al 2022), resulting in high and poorly constrained uncertainties. Alexander et al (2012) developed a powerful technique to estimate the water isotopic composition of chondritic parent bodies based on measurements of D/H and C/H ratios of the whole rock chondrites.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu

Piani

Nagashima

Kawasaki

et al. 2023

ApJL

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Rock fragments of the Cb-type asteroid Ryugu returned to Earth by the JAXA Hayabusa2 mission share mineralogical, chemical, and isotopic properties with the Ivuna-type (CI) carbonaceous chondrites. Similar to CI chondrites, these fragments underwent extensive aqueous alteration and consist predominantly of hydrous minerals likely formed in the presence of liquid water on the Ryugu parent asteroid. Here we present an in situ analytical survey performed by secondary ion mass spectrometry from which we have estimated the D/H ratio of Ryugu’s hydrous minerals, D/HRyugu, to be [165 ± 19] × 10−6, which corresponds to δDRyugu = +59 ± 121‰ (2σ). The hydrous mineral D/HRyugu’s values for the two sampling sites on Ryugu are similar; they are also similar to the estimated D/H ratio of hydrous minerals in the CI chondrites Orgueil and Alais. This result reinforces a link between Ryugu and CI chondrites and an inference that Ryugu’s samples, which avoided terrestrial contamination, are our best proxy to estimate the composition of water at the origin of hydrous minerals in CI-like material. Based on this data and recent literature studies, the contribution of CI chondrites to the hydrogen of Earth’s surficial reservoirs is evaluated to be ∼3%. We conclude that the water responsible for the alteration of Ryugu’s rocks was derived from water ice precursors inherited from the interstellar medium; the ice partially re-equilibrated its hydrogen with the nebular H2 before being accreted on the Ryugu’s parent asteroid.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu

Piani

Nagashima

Kawasaki

et al. 2023

ApJL

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“…This is potentially because the organics were either insoluble in water and/or strongly adsorbed on the minerals. The local heterogeneity of minerals, which might be the result of heterogeneous aqueous alteration processes, composition and/or pH of the alteration fluid, space weathering, or impacts, could also result in different compositions of organics (Hirakawa et al., 2021; Viennet et al., 2022; Vinogradoff et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

Nanoscale Spectroscopic Identification and Characterization of Minerals and Organic Matter in Ryugu Particles

Yesiltas,

Glotch,

Kebukawa

et al. 2024

JGR Planets

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Carbonaceous asteroids are leftover materials from the early solar system. They did not undergo planetary differentiation processes and thus still retained signatures and clues of the origin and evolution of the solar system. Thus, samples of carbonaceous asteroids provide significant potential for deciphering the origin of the solar system. The Hayabusa2 spacecraft returned the first samples of a carbonaceous asteroid (162173) Ryugu. In this work, we report the nanoscale mineralogy and organic matter content of two Ryugu particles, A0030 and C0034. These were analyzed by highly novel scattering‐type scanning near‐field optical microscopy (s‐SNOM)‐based nanoscale‐Fourier transform infrared (nano‐FTIR) spectroscopy with ∼20 nm spatial resolution. The nano‐FTIR measurements were supported by confocal micro‐Raman imaging and spectroscopy (∼500 nm/pixel spatial sampling). Our investigations show that the two Ryugu particles (a) contain different silicate mineralogies, indicating heterogeneous and incomplete aqueous alteration and (b) are highly rich in organic matter, consisting a variety of molecular functional groups. The spatial distributions of chemical functional groups and their associations based on pseudo‐heterodyne (PsHet) SNOM imaging show that the organic matter is distributed as either diffused or discrete grains. Micro‐Raman spectra show that the Ryugu particles experienced minimal thermal metamorphism, although A0030 was slightly more heated than C0034. The identification of abundant nanoscale organic molecules within the Ryugu grains that could not be identified via micrometer‐scale investigations emphasizes the importance of using nanoscale nondestructive methods for studying primitive solar system materials, such as Ryugu and OSIRIS‐Rex particles and those that will be returned in the future (such as MMX samples).

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“…It could then be accreted with silicate and metal grains to form parent bodies of meteorites. It must be noted that formation of IOM from soluble compounds during alteration under asteroidal conditions is hampered by the presence of clay minerals (Viennet et al 2022;Vinogradoff et al 2020). IOMA and IOM share several molecular characteristics: aromaticity, molecular diversity, and O content, even if some differences remain, such as a higher amount of N in IOMA.…”

Section: Dense Molecular Ices As a Source Of Chondritic Sommentioning

confidence: 99%

The transition from soluble to insoluble organic matter in interstellar ice analogs and meteorites

Danger

Ruf

Javelle

et al. 2022

A&A

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Context. Carbonaceous chondrites are sources of information on the origin of the Solar System. Their organic content is conventionally classified as soluble (SOM) and insoluble organic matter (IOM), where the latter represents the majority. Aims. In this work, our objectives are to identify possible relations between soluble and insoluble organic matter generated in laboratory experiments and to extrapolate the laboratory analog findings to soluble and insoluble organic matter of meteorites to test their connection. Methods. Using laboratory experiments, processes possibly linking IOM analog (IOMA) to SOM analog (SOMA) precursors are investigated by assuming that dense molecular ices are one of the sources of organic matter in the Solar System. Each organic fraction is analyzed by laser desorption coupled to a Fourier transform ion cyclotron resonance mass spectrometer on a comprehensive basis. Results. SOMA and IOMA significantly differ in their chemical fingerprints, and particularly in their aromaticity, O/C, and N/C elemental ratios. Using an innovative molecular network, the SOMA-IOMA transition was tested, revealing connection between both classes. This new network suggests that IOMA is formed in two steps: a first generation IOMA based on precursors from SOMA, while a second IOMA generation is formed by altering the first IOMA generation. Finally, using the same analytical technique, the molecular content of IOMA and that of the Paris IOM are compared, showing their molecular similarities for the first time. The molecular network application to the Paris SOM and IOM demonstrates that a possible connection related to photochemical ice processing is present, but that the overall history of IOM formation in meteorites is much more complex and might have been affected by additional factors (e.g., aqueous alteration). Conclusions. Our approach provides a new way to analyze the organic fraction of extraterrestrial material, giving new insights into the evolution of organic matter in the Solar System.

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Experimental investigation of Fe-clay/organic interactions under asteroidal conditions

Cited by 10 publications

References 90 publications

Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu

Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu

Nanoscale Spectroscopic Identification and Characterization of Minerals and Organic Matter in Ryugu Particles

The transition from soluble to insoluble organic matter in interstellar ice analogs and meteorites

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