Interaction between clay minerals and organics in asteroid Ryugu

Viennet, J.-C.; Roskosz, M.; Nakamura, T.; Beck, P.; Baptiste, B.; Lavina, B.; Alp, E.E.; Hu, M.Y.; J., Zhao,; Gounelle, M.; Brunetto, R.; Yurimoto, H.; Noguchi, T.; Okazaki, R.; Yabuta, H.; Naraoka, H.; Sakamoto, K.; Tachibana, S.; Yada, T.; Nishimura, M.; Nakato, A.; Miyazaki, A.; Yogata, K.; Abe, M.; Okada, T.; Usui, T.; Yoshikawa, M.; Saiki, T.; Tanaka, S.; Terui, F.; Nakazawa, S.; Watanabe, S.-I.; Tsuda, Y.

doi:10.7185/geochemlet.2307

Cited by 19 publications

(5 citation statements)

References 27 publications

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“…It is not clear whether the organic IR features are derived from macromolecular organic matter or smaller/soluble organic compounds. However, one possibility is that the organics overlapping with phyllosilicates could be soluble compounds present in the interlayer spaces; additionally, organics that did not overlap with phyllosilicates could be macromolecular materials, since the organic matter is known to be present in the interlayer spaces of phyllosilicates in Ryugu particles (Viennet et al., 2023).…”

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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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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“…Looking at the distribution of the diffuse organic matter in the whole-rock sample, the CH X signature of these labile molecules seems intimately linked to the phyllosilicates. Viennet et al (2023) have suggested that organics are contained in the interlayer space of Ryugu smectites, whereas the interlayer space of Orgueil A198, page 7 of 14 Fig. 6.…”

Section: Insoluble Organic Matter Analysismentioning

confidence: 99%

AFM-IR nanospectroscopy of nanoglobule-like particles in Ryugu samples returned by the Hayabusa2 mission

Mathurin,

Bejach,

Dartois

et al. 2024

A&A

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The JAXA Hayabusa2 mission returned well-preserved samples collected from the carbonaceous asteroid Ryugu, providing unique non-terrestrially weathered samples from a known parent body. This work aims to provide a better understanding of the formation and evolution of primitive asteroidal matter by studying the fine scale association of organic matter and minerals in Ryugu samples. We characterized the samples by IR nanospectroscopy using the AFM-IR technique. This technique overcomes the diffraction limit (of several microns) of conventional infrared microspectroscopy (µ-FTIR). The samples were mapped in the mid-IR range at a lateral spatial resolution about a hundred times better than with µ-FTIR. This provided us with unique in situ access to the distribution of the different infrared signatures of organic components at the sub-micron scale present in the Ryugu whole-rock samples as well as to the characterization of the compositional variability of Ryugu in the insoluble organic matter (IOM) chemically extracted from the Ryugu samples. The AFM-IR maps of whole-rock particles and IOM residues from Ryugu samples were recorded with a lateral resolution of tens of nanometers. Spectra were recorded in the 1900-900 cm$^−1$ spectral range by AFM-IR (Icon-IR) for all samples, and additional spectra were recorded from 2700 to 4000 cm$^−1$ for one IOM sample by an optical photothermal IR (O-PTIR) technique using a mIRage$^ textregistered $ IR microscope. Organic matter is present in two forms in the whole-rock samples: as a diffuse phase intermixed with the phyllosilicate matrix and as individual organic nanoparticles. We identify the Ryugu organic nanoparticles as nanoglobule-like inclusions texturally resembling nanoglobules present in primitive meteorites. Using AFM-IR, we record for the first time the infrared spectra of Ryugu organic nanoparticles that clearly show enhanced carbonyl (C=O) and CH contributions with respect to the diffuse organic matter in Ryugu whole-rock and IOM residue.

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“…Therefore, the iron nitride could have been produced by vapour from Ryugu's materials that is richer in nitrogen than carbon. It has been suggested that NH-rich compounds and NH-bearing organics occur within the interlayers of phyllosilicates in Ryugu samples 37,38 , but a large clump of nitrogen-dominated…”

Section: Nitridation Of the Space-weathered Surfacesmentioning

confidence: 99%

“…37 CAS Center for Excellence in Deep Earth Science, Guangzhou, China. 38 Japan Synchrotron Radiation Research Institute, Sayō, Japan. 39 University of Chinese Academy of Sciences, Beijing, China.…”

Section: Helium Ion Irradiation Experiments Of Ryugu Grainsmentioning

confidence: 99%

Influx of nitrogen-rich material from the outer Solar System indicated by iron nitride in Ryugu samples

Matsumoto,

Noguchi,

Miyake

et al. 2023

Nat Astron

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Large amounts of nitrogen compounds, such as ammonium salts, may be stored in icy bodies and comets, but the transport of these nitrogen-bearing solids into the near-Earth region is not well understood. Here, we report the discovery of iron nitride on magnetite grains from the surface of the near-Earth C-type carbonaceous asteroid Ryugu, suggesting inorganic nitrogen fixation. Micrometeoroid impacts and solar wind irradiation may have caused the selective loss of volatile species from major iron-bearing minerals to form the metallic iron. Iron nitride is a product of nitridation of the iron metal by impacts of micrometeoroids that have higher nitrogen contents than the CI chondrites. The impactors are probably primitive materials with origins in the nitrogen-rich reservoirs in the outer Solar System. Our observation implies that the amount of nitrogen available for planetary formation and prebiotic reactions in the inner Solar System is greater than previously recognized.

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Interaction between clay minerals and organics in asteroid Ryugu

Cited by 19 publications

References 27 publications

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

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

AFM-IR nanospectroscopy of nanoglobule-like particles in Ryugu samples returned by the Hayabusa2 mission

Influx of nitrogen-rich material from the outer Solar System indicated by iron nitride in Ryugu samples

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