Oxygen isotopes in HED meteorites and their constraints on parent asteroids

Zhang, Chuantong; Miao, Bingkui; He, Huaiyu

doi:10.1016/j.pss.2019.02.007

Cited by 13 publications

(15 citation statements)

References 81 publications

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“…Interstitial areas between grains have been darkened by shock, and they reflect the primary lithology of the meteorites. b Δ 17 O diagram showing NWA 12217, 12319, and 12562 in relation to other achondrite groups 39 , 62 – 64 . The TFL is the mass-dependent terrestrial fractionation line.…”

Section: Resultsmentioning

confidence: 99%

Olivine-rich achondrites from Vesta and the missing mantle problem

et al. 2021

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Mantles of rocky planets are dominantly composed of olivine and its high-pressure polymorphs, according to seismic data of Earth’s interior, the mineralogy of natural samples, and modelling results. The missing mantle problem represents the paucity of olivine-rich material among meteorite samples and remote observation of asteroids, given how common differentiated planetesimals were in the early Solar System. Here we report the discovery of new olivine-rich meteorites that have asteroidal origins and are related to V-type asteroids or vestoids. Northwest Africa 12217, 12319, and 12562 are dunites and lherzolite cumulates that have siderophile element abundances consistent with origins on highly differentiated asteroidal bodies that experienced core formation, and with trace element and oxygen and chromium isotopic compositions associated with the howardite-eucrite-diogenite meteorites. These meteorites represent a step towards the end of the shortage of olivine-rich material, allowing for full examination of differentiation processes acting on planetesimals in the earliest epoch of the Solar System.

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Section: Resultsmentioning

confidence: 99%

Olivine-rich achondrites from Vesta and the missing mantle problem

et al. 2021

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“…Whereas all the previously mentioned analyses seem to suggest that PCA 82502 came from a different parent body, more recent high-precision oxygen isotope analyses yielded a Δ 17 O isotopic composition of −0.223‰ (no uncertainty given; Greenwood et al 2017). This value is indistinguishable from the average Δ 17 O isotopic composition of the HED meteorites (Δ 17 O = −0.240 AE 0.01‰; Greenwood et al 2017;Zhang et al 2019) at the 2σ level which suggests that PCA 82502 originated from the same parent body as the HED meteorites. This is compatible with PCA 82502 having a similar LREE-depleted pattern similar to some other eucrites such as EET 90020, MET 01081, and PCA 91078 (Bermingham et al 2008).…”

Section: Origin and Formation Of Pca 82502mentioning

confidence: 72%

“…4) indicating post-crystallization cooling of moderate speed (Leroux et al 2016) in agreement with the medium size of the crystals and probably indicating an intrusive nature. Its oxygen composition is indistinguishable from the main eucritic population (Δ17O = −0.22‰; Greenwood et al 2017;Zhang et al 2019) and it has a light REE-depleted pattern and Eu positive anomaly similar to few other equilibrated eucrites such as EET90020 and to cumulate eucrites (Bermingham et al 2008;Yamaguchi et al 2009) and thus suggests that PCA 82502 too comes from Vesta. PCA 82502 includes two distinct lithologies with similarly old ages: veins of very fine-grained gray and crumbly matrix and large and abundant mediumgrained crystalline clasts of seemingly the same material (Figs.…”

Section: Origin and Shock History Of Pca 82502mentioning

confidence: 90%

“…1) (Bermingham et al 2008). However, the lack of any significant, observable shock in thin section, its unequilibrated state, along with its recent reinstatement in the HED clan (Greenwood et al 2017;Zhang et al 2019) prompted us to investigate if PCA 82502 could help better constrain the timing of the magmatic activity of 4 Vesta. We will demonstrate hereafter that, through dating of the crystalline igneous clasts, PCA 82502 provides a robust age constraint on the end (or near end) of the magmatic period on asteroid 4 Vesta.…”

Section: Introductionmentioning

confidence: 99%

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End of magmatism in the upper crust of asteroid 4 Vesta

Jourdan

Forman

Kennedy

et al. 2021

Meteorit & Planetary Scien

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Asteroid 4 Vesta is the only largely preserved differentiated asteroid and thus is an excellent proxy to study early magmatism occurring on planets and moons. In this study, we focus on eucrite Pecora Escarpment (PCA) 82502, a medium-to fine-grained eucrite which chemical analyses suggest belongs to the main howardite-eucrite-diogenite clan, albeit with some peculiarities. We carried out backscattered electron and electron backscattered diffraction microscopy analyses of the meteorite along with step-heating 40 Ar/ 39 Ar dating analyses of various types of groundmass aliquots. We show that Pecora Escarpment 82502 is composed of medium-grained igneous crystalline clasts and smaller fractured satellite clasts surrounded by approximately 50 µm wide impact melt veins of the same composition. Our results show that the large crystalline clasts and fine-grained veins both display little evidence of shock processes. Six groundmass aliquots from large crystalline clasts returned concordant plateau (>70% of 39 Ar) or mini-plateau (50-70% of 39 Ar) 40 Ar/ 39 Ar ages with a weighted mean of 4531 AE 6 Ma (P = 0.67). Thermodynamic cooling and 40 Ar diffusion models suggest that the K/Ar system recorded and preserved the igneous age despite subsequent infiltration of hot and quickly quenched melt veins. Our new igneous age, combined with evidence for four other young volcanic and plutonic eucrites of similar age, shows that Vesta was still magmatically active around 4531 Ma. The lack of younger ages suggests that this age might well represent the end of the magmatic activity in the upper crust of Vesta. When combined with existing paleomagnetic constraints, our data suggest that 4 Vesta had an active dynamo that was still active~35 Ma after accretion. 620F. Jourdan et al.

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“…The subsequent discovery of V-type asteroids near the gravitational resonance region of the asteroid belt [4] implies a possible transfer mechanism of the HED meteorites from Vesta to Earth [5] from the dynamics perspective. Therefore, there has been a wide consensus that the HEDs may come from Vesta or V-type asteroids ejected from Vesta [1,2], although this has been challenged by the discovery of anomalous oxygen isotopes in few eucrites recently [6][7][8][9]. Except for lunar and Martian meteorites, the HEDs are the only available group of meteorites which may have a genetic link with definite parent asteroid [10].…”

Section: Introductionmentioning

confidence: 99%

A Petrologic and Noble Gas Isotopic Study of New Basaltic Eucrite Grove Mountains 13001 from Antarctica

Zhang

Miao

et al. 2021

Minerals

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Howardite-Eucrite-Diogenite (HED) meteorite clan is a potential group of planetary materials which provides significant clues to understand the formation and evolution of the solar system. Grove Mountains (GRV) 13001 is a new member of HED meteorite, recovered from the Grove Mountains of Antarctica by the Chinese National Antarctic Research Expedition. This research work presents a comprehensive study of the petrology and mineralogy, chemical composition, noble gas isotopes, cosmic-ray exposure (CRE) age and nominal gas retention age for the meteorite GRV 13001. The output data indicate that GRV 13001 is a monomict basaltic eucrite with typical ophitic/subophitic texture, and it consists mainly of low-Ca pyroxene and plagioclase with normal eucritic chemical compositions. The noble gas based CRE age of the GRV 13001 is approximately 29.9 ± 3.0 Ma, which deviates from the major impact events or periods on the HED parent body. Additionally, the U,Th-4He and 40K-40Ar gas retention ages of this meteorite are ~2.5 to 4.0 Ga and ~3.6 to 4.1 Ga, respectively. Based on the noble gases isotopes and the corresponding ages, GRV 13001 may have experienced intense impact processes during brecciation, and weak thermal event after the ejection event at approximately 30 Ma.

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Oxygen isotopes in HED meteorites and their constraints on parent asteroids

Cited by 13 publications

References 81 publications

Olivine-rich achondrites from Vesta and the missing mantle problem

Olivine-rich achondrites from Vesta and the missing mantle problem

End of magmatism in the upper crust of asteroid 4 Vesta

A Petrologic and Noble Gas Isotopic Study of New Basaltic Eucrite Grove Mountains 13001 from Antarctica

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