Crystal growth and disequilibrium distribution of oxygen isotopes in an igneous Ca-Al-rich inclusion from the Allende carbonaceous chondrite

Kawasaki, Noriyuki; Simon, S. B.; Grossman, Lawrence; Sakamoto, Naoya; Yurimoto, H.

doi:10.1016/j.gca.2017.05.035

Cited by 47 publications

(45 citation statements)

References 70 publications

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“…By using the Princivalle et al (1999) thermometer, we calculated the intercrystalline closure temperatures of the meteoritic spinels and found out T c in the range 465-520°C. The Allende parent body is known to have undergone thermal metamorphism with a peak temperature of about 600°C (Huss et al [2006] and references therein; Ito and Messenger 2010;Kawasaki et al 2018). The found T c are consistent with the estimate of the peak metamorphic temperature of Allende.…”

Section: Discussionsupporting

confidence: 69%

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MgAl₂O₄ spinels from Allende and NWA 763 carbonaceous chondrites: Structural refinement, cooling history, and trace element contents

Lenaz

Lughi

Perugini

et al. 2019

Meteorit & Planetary Scien

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MgAl2O4 spinels from Allende and NWA 763 carbonaceous chondrites were studied by X‐ray single crystal diffraction, SEM, electron microprobe, LA‐ICP‐MS, and Raman spectroscopy. Those from Allende are almost pure, but, in one case, we found a strong FeOtot zonation. Spinels from NWA 763 show Mg‐Fe2+ substitutions. Almost pure MgAl2O4 spinels from both meteorites underwent slow cooling and reached their intracrystalline closure temperature (Tc) in the range 460–520 °C. The NWA 763 spinel with higher FeO content shows a Tc of about 720 °C. X‐ray single crystal diffraction and Raman spectroscopy suggest a slow cooling and an ordered structure with trivalent cations in M site and divalent in T site. Among the trace elements, Ti and Co are enriched with respect to the terrestrial analogs, while Mn, Ni, and Sn show intermediate values between different terrestrial occurrences. Vanadium cannot be used as a tracer of extraterrestrial origin as for Cr‐spinels, because its content is similar in extraterrestrial and terrestrial spinels. In the zoned crystal from Allende, Co show a strong zonation similar to that of FeO.

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Section: Discussionsupporting

confidence: 69%

“…and references therein; Ito and Messenger ; Kawasaki et al. ). The found T c are consistent with the estimate of the peak metamorphic temperature of Allende.…”

Section: Discussionmentioning

confidence: 99%

MgAl₂O₄ spinels from Allende and NWA 763 carbonaceous chondrites: Structural refinement, cooling history, and trace element contents

Lenaz

Lughi

Perugini

et al. 2019

Meteorit & Planetary Scien

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“…In carbonaceous chondrites of petrologic types 2-3.0, refractory inclusions are isotopically uniform with respect to oxygen (Fig. 11) Katayama et al 2012;Kawasaki et al 2012Kawasaki et al , 2017Kawasaki et al , 2018Krot et al 2014bKrot et al , 2018cKrot et al , 2018dAl eon 2016;Williams et al 2017;Al eon et al 2007Al eon et al , 2018. In the Oxygen Isotopic Exchange in Chondrules and Texturally Fine-Grained Refractory Inclusions in Metamorphosed CV and CO Chondrites During Fluid-rock Interaction section, I discuss the .…”

Section: Origin Of Oxygen Isotopic Heterogeneity In Refractory Inclusmentioning

confidence: 97%

“…2012b; Aléon ; Kawasaki et al. ). It is suggested that these observations may reflect crystallization of the pyroxenes (1) during partial melting of the initially 16 O‐rich (with solar‐like Δ 17 O) CAIs in a nebular gas with rapidly changing O‐isotope composition from 16 O‐rich to 16 O‐poor and to 16 O‐rich again (Kawasaki et al.…”

Section: Oxygen Isotopic Compositions Of Chondrites and Their Componentsmentioning

confidence: 99%

“…It is suggested that these observations may reflect crystallization of the pyroxenes (1) during partial melting of the initially 16 O‐rich (with solar‐like Δ 17 O) CAIs in a nebular gas with rapidly changing O‐isotope composition from 16 O‐rich to 16 O‐poor and to 16 O‐rich again (Kawasaki et al. ); (2) during partial melting and dissolution of 16 O‐poor perovskite in an 16 O‐rich melilite melt followed by O‐isotope exchange of melilite with an 16 O‐poor gaseous reservoir (MacPherson et al. 2012b); (3) during back‐reaction of early crystallized 16 O‐rich spinel with a silicate partial melt having previously undergone an 16 O‐depletion (Aléon ).…”

Section: Oxygen Isotopic Compositions Of Chondrites and Their Componentsmentioning

confidence: 99%

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Refractory inclusions in carbonaceous chondrites: Records of early solar system processes

Krot

2019

Meteorit & Planetary Scien

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Chondrites consist of three major components: refractory inclusions (Ca,Al‐rich inclusions [CAIs] and amoeboid olivine aggregates), chondrules, and matrix. Here, I summarize recent results on the mineralogy, petrology, oxygen, and aluminum‐magnesium isotope systematics of the chondritic components (mainly CAIs in carbonaceous chondrites) and their significance for understanding processes in the protoplanetary disk (PPD) and on chondrite parent asteroids. CAIs are the oldest solids originated in the solar system: their U‐corrected Pb‐Pb absolute age of 4567.3 ± 0.16 Ma is considered to represent time 0 of its evolution. CAIs formed by evaporation, condensation, and aggregation in a gas of approximately solar composition in a hot (ambient temperature >1300 K) disk region exposed to irradiation by solar energetic particles, probably near the protoSun; subsequently, some CAIs were melted in and outside their formation region during transient heating events of still unknown nature. In unmetamorphosed, type 2–3.0 chondrites, CAIs show large variations in the initial 26Al/27Al ratios, from <5 × 10–6 to ~5.25 × 10–5. These variations and the inferred low initial abundance of 60Fe in the PPD suggest late injection of 26Al by a wind from a nearby Wolf–Rayet star into the protosolar molecular cloud core prior to or during its collapse. Although there are multiple generations of CAIs characterized by distinct mineralogies, textures, and isotopic (O, Mg, Ca, Ti, Mo, etc.) compositions, the 26Al heterogeneity in the CAI‐forming region(s) precludes determining the duration of CAIs formation using 26Al‐26Mg systematics. The existence of multiple generations of CAIs and the observed differences in CAI abundances in carbonaceous and noncarbonaceous chondrites may indicate that CAIs were episodically formed and ejected by a disk wind from near the Sun to the outer solar system and then spiraled inward due to gas drag. In type 2–3.0 chondrites, most CAIs surrounded by Wark–Lovering rims have uniform Δ17O (= δ17O−0.52 × δ18O) of ~ −24‰; however, there is a large range of Δ17O (from ~−40 to ~ −5‰) among them, suggesting the coexistence of 16O‐rich (low Δ17O) and 16O‐poor (high Δ17O) gaseous reservoirs at the earliest stages of the PPD evolution. The observed variations in Δ17O of CAIs may be explained if three major O‐bearing species in the solar system (CO, H2O, and silicate dust) had different O‐isotope compositions, with H2O and possibly silicate dust being 16O‐depleted relative to both the Genesis solar wind Δ17O of −28.4 ± 3.6‰ and even more 16O‐enriched CO. Oxygen isotopic compositions of CO and H2O could have resulted from CO self‐shielding in the protosolar molecular cloud (PMC) and the outer PPD. The nature of 16O‐depleted dust at the earliest stages of PPD evolution remains unclear: it could have either been inherited from the PMC or the initially 16O‐rich (solar‐like) MC dust experienced O‐isotope exchange during thermal processing in the PPD. To understand the chemical and isotopic composition of the protosolar MC...

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The Hayabusa2 mission: what will we expect from samples from C-type near-Earth asteroid (162173) Ryugu?

Tachibana

2021

Sample Return Missions

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Crystal growth and disequilibrium distribution of oxygen isotopes in an igneous Ca-Al-rich inclusion from the Allende carbonaceous chondrite

Cited by 47 publications

References 70 publications

MgAl₂O₄ spinels from Allende and NWA 763 carbonaceous chondrites: Structural refinement, cooling history, and trace element contents

MgAl₂O₄ spinels from Allende and NWA 763 carbonaceous chondrites: Structural refinement, cooling history, and trace element contents

Refractory inclusions in carbonaceous chondrites: Records of early solar system processes

The Hayabusa2 mission: what will we expect from samples from C-type near-Earth asteroid (162173) Ryugu?

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Crystal growth and disequilibrium distribution of oxygen isotopes in an igneous Ca-Al-rich inclusion from the Allende carbonaceous chondrite

Cited by 47 publications

References 70 publications

MgAl2O4 spinels from Allende and NWA 763 carbonaceous chondrites: Structural refinement, cooling history, and trace element contents

MgAl2O4 spinels from Allende and NWA 763 carbonaceous chondrites: Structural refinement, cooling history, and trace element contents

Refractory inclusions in carbonaceous chondrites: Records of early solar system processes

The Hayabusa2 mission: what will we expect from samples from C-type near-Earth asteroid (162173) Ryugu?

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Product

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MgAl₂O₄ spinels from Allende and NWA 763 carbonaceous chondrites: Structural refinement, cooling history, and trace element contents

MgAl₂O₄ spinels from Allende and NWA 763 carbonaceous chondrites: Structural refinement, cooling history, and trace element contents