On the provenance of GEMS, a quarter century post discovery

Bradley, J. P.; Ishii, H. A.; Bustillo, Karen C.; Ciston, J.; Ogliore, R. C.; Stephan, T.; Brownlee, D. E.; Joswiak, D. J.

doi:10.1016/j.gca.2022.06.036

Cited by 13 publications

(3 citation statements)

References 86 publications

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“…Nanoscale sulfides and Mg-rich carbonates are restricted to the SOC areas and interpreted as primary condensates (see the Supplementary Materials for detailed explanation). These SOCs resemble glass with embedded metal and sulfide phases (i.e., GEMS) in IDPs and GEMS-like materials in primitive chondrites ( 24 , 25 ). The absence of metal and their relative sizes place the origin of these SOC most closely to GEMS-like matter in primitive chondrites (see the Supplementary Materials).…”

Section: Resultsmentioning

confidence: 97%

The nucleosynthetic fingerprint of the outermost protoplanetary disk and early Solar System dynamics

van Kooten,

Zhao,

Franchi

et al. 2024

Sci. Adv.

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Knowledge of the nucleosynthetic isotope composition of the outermost protoplanetary disk is critical to understand the formation and early dynamical evolution of the Solar System. We report the discovery of outer disk material preserved in a pristine meteorite based on its chemical composition, organic-rich petrology, and 15 N-rich, deuterium-rich, and 16 O-poor isotope signatures. We infer that this outer disk material originated in the comet-forming region. The nucleosynthetic Fe, Mg, Si, and Cr compositions of this material reveal that, contrary to current belief, the isotope signature of the comet-forming region is ubiquitous among outer Solar System bodies, possibly reflecting an important planetary building block in the outer Solar System. This nucleosynthetic component represents fresh material added to the outer disk by late accretion streamers connected to the ambient molecular cloud. Our results show that most Solar System carbonaceous asteroids accreted material from the comet-forming region, a signature lacking in the terrestrial planet region.

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Section: Resultsmentioning

confidence: 97%

The nucleosynthetic fingerprint of the outermost protoplanetary disk and early Solar System dynamics

van Kooten,

Zhao,

Franchi

et al. 2024

Sci. Adv.

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“…They were then rediscovered by Nakamura et al (2002) and Garvie & Buseck (2006), who dismissed the idea of these structures being of biogenic origin. Nanoglobules are present in primitive meteorites (e.g., De Gregorio et al 2013), in Stardust's samples returned from the comet 81P (Wild2) (De Gregorio et al 2010), in micrometeorites (Maurette et al 1995), UCAMMs (Bradley & Ishii 2017;Yabuta et al 2017), and in chondritic anhydrous IDPs and micrometeorites (Messenger et al 2008;Bradley et al 2022;Noguchi et al 2022).…”

Section: Ryugu Nanoglobule-like Particles Compared To Their Meteoriti...mentioning

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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“…The asteroid Ryugu is thought to have been an icy planetesimal that formed through the accretion of dust particles, consisting of GEMS (glass with embedded metal and sulfides) [49]-like matter and ice mantles that contain OM molecules. The accreted components recorded various origins, including the ISM and PSN.…”

Section: Formation Of a Progenitor Planetesimalmentioning

confidence: 99%

The Formation of a Rubble Pile Asteroid: Insights from the Asteroid Ryugu

et al. 2023

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The Hayabusa2 mission returned primitive samples from the C-type asteroid Ryugu to Earth. The C-type asteroids hold clues to the origin of Earth’s water and the building blocks of life. The rubble pile structure of C-type asteroids is a crucial physical feature relating to their origin and evolution. A rubble pile asteroid is hypothesized to be bound primarily by self-gravity with a significant void space among irregularly shaped materials after catastrophic impacts between larger asteroids. However, the geological observations from Hayabusa2 and the analyses of the returned sample from Ryugu revealed that the high microporosity was common to various >10 m- to mm-sized materials of Ryugu, which suggests that the asteroid Ryugu is not just a loosely bound agglomeration of massive rocky debris from shattered asteroids. For a better understanding of the origin and evolution of the rubble pile asteroid, the current most accepted hypothesis should be verified by observations and laboratory analyses and improved upon based on this information. Here, the previous models are examined using Hayabusa2’s geological observations of the asteroid and the analytical data from the samples returned from Ryugu’s surface and subsurface material. Incorporating the new findings, a hypothesis for the evolution of the rubble pile asteroid Ryugu from a cometary nucleus through sublimation and subsequent dynamic resurfacing is proposed. The proposed hypothesis is applicable to other rubble-pile asteroids and would provide perspectives for near-Earth objects in general.

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On the provenance of GEMS, a quarter century post discovery

Cited by 13 publications

References 86 publications

The nucleosynthetic fingerprint of the outermost protoplanetary disk and early Solar System dynamics

The nucleosynthetic fingerprint of the outermost protoplanetary disk and early Solar System dynamics

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

The Formation of a Rubble Pile Asteroid: Insights from the Asteroid Ryugu

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