Origin of 16O-rich fine-grained Ca-Al-rich inclusions of different mineralogy and texture

Han, J.; Jacobsen, Ben; Liu, Ming‐Chang; Brearley, Adrian J.; Matzel, J.; Keller, L. P.

doi:10.1016/j.chemer.2019.125543

Cited by 10 publications

(5 citation statements)

References 48 publications

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“…. Similar relationships were observed from spinel-rich CAIs from carbonaceous chondrites (Han et al 2015Needham et al 2017;Han et al 2019).…”

Section: Planar Defects In Hibonitesupporting

confidence: 78%

“…First, hibonite in CAIs and their rims from carbonaceous chondrites contains abundant planar defects along the (001) plane that are often correlated with Mg enrichments and Ti depletions (Keller 1991;Han et al 2015Needham et al 2017;Han et al 2020 (Schmid and De Jonghe 1983;Han et al 2015). Second, hibonite in spinel-rich CAIs from carbonaceous chondrites often shares a consistent crystallographic orientation relationship with adjacent spinel, such that (001) hibonite //(111) spinel (Han et al 2015Needham et al 2017;Han et al 2019). This relationship provides strong evidence that the structural similarity between hibonite and spinel enabled epitaxial nucleation and growth of spinel on hibonite surfaces, thereby kinetically inhibiting melilite formation (MacPherson et al 1984;Beckett and Stolper 1994;Simon et al 2006;Han et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Kӧӧp et al 2016). In general, spinel intergrown with hibonite in least altered CAIs from carbonaceous chondrites is close to pure stoichiometric MgAl 2 O 4 (e.g.,Han et al 2015Han et al , 2019. In addition, fast Fourier transform (FFT) analyses of HRTEM images show a crystallographic orientation relationship between host hibonite and spinel inclusion, such that [100] hibonite //[011] spinel and (001) hibonite //(111) spinel…”

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confidence: 99%

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Atomic-scale structure and non-stoichiometry of meteoritic hibonite: A transmission electron microscope study

Han

Yasuhara

Keller

2022

American Mineralogist

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Hibonite (CaAl 12 O 19 ) is a common refractory mineral in Ca-Al-rich inclusions (CAIs) in primitive meteorites. Transmission electron microscope (TEM) studies have identified enigmatic planar defects in different occurrences of hibonite in the Allende meteorite that give rise to strong streaking along c* in electron diffraction patterns. Atomic resolution high-angle annular dark-field (HAADF) imaging and energy dispersive X-ray (EDX) analyses were used to This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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“…. Similar relationships were observed from spinel-rich CAIs from carbonaceous chondrites (Han et al 2015Needham et al 2017;Han et al 2019).…”

Section: Planar Defects In Hibonitesupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Atomic-scale structure and non-stoichiometry of meteoritic hibonite: A transmission electron microscope study

Han

Yasuhara

Keller

2022

American Mineralogist

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“…Therefore, studies of new carbonaceous chondrites are critical in defining the basic materials that make up our inner solar system and bridging the gap between asteroid belt observations and terrestrial recovered meteorite material. Carbonaceous chondrites of the Ornans type (CO) in particular have provided insights into early solar system processes and conditions with numerous studies of their components such as chondrules (e.g., Berlin et al., 2011; Wick & Jones, 2012), metal (e.g., Daly et al., 2017), organics (e.g., Burton et al., 2012; De Gregorio et al., 2013), calcium‐aluminum‐rich inclusions and other refractory inclusions (e.g., Han et al., 2019; Krot, 2019; Simon & Grossman, 2015), matrix (e.g., Brearley, 1993), presolar grains (e.g., Nguyen et al., 2010; Nittler et al., 2018), and nebular isotopic properties (e.g., Ebert et al., 2018; Nielsen et al., 2019; Zhu et al., 2021). Identifying the most primitive and least thermally altered CO3 chondrites is critical to provide material for the wide diversity of studies being carried out on carbonaceous chondrites.…”

Section: Introductionmentioning

confidence: 99%

Pairing relations within CO3 chondrites recovered at the Dominion Range and Miller Range, Transantarctic mountains: Constraints from chondrule olivines, noble gas, and H, C, N bulk and isotopic compositions

Righter,

Alexander,

Foustoukos

et al. 2024

Meteorit & Planetary Scien

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The Dominion Range (DOM) and Miller Range (MIL) dense collection areas (DCAs) have yielded more than 20 and 200 CO3 chondrites (carbonaceous chondrites of the Ornans chemical group), respectively, over multiple field seasons. Several samples have exhibited primitive characteristics and have been the focus of interest. With so many CO3s recovered from this area, a natural question is if there are multiple pairing groups (where pairing refers to two or more meteorites that are part of a single fall) and if there is additional primitive material that would interest the meteorite community. This comprehensive study looks at all samples using several approaches: field and macroscopic observations; magnetic susceptibility; Cr in ferroan olivine; bulk elemental and isotopic analysis of H, C, N, and noble gas analyses to determine cosmic ray exposure (CRE) ages. Magnetic susceptibilities (measured as logχ) for all samples correlate with their type II (i.e., FeO‐rich) olivine Cr contents, with the most primitive CO3s (3.00) have logχ values near 5, while the higher grade CO3s have logχ values as low as 4.17. Altogether, there appear to be two distinct CO3 pairing groups and five other unpaired CO3s recovered at the Dominion Range: (a) the main DOM 08004 pairing group (16 specimens with a CRE age of 10–16 Ma), (b) the DOM 08006 group (2 specimens incl. DOM 10847 with a CRE age of 25 Ma), (c) DOM 14359 with a CRE age of 6 Ma, (d) DOM 18070 with a CRE age of 8 Ma (these two samples have similar ages but distinct trapped 20Ne contents), (e) DOM 10900 with a CRE age of 5.5 Ma, (f) DOM 18286 (with a CRE age of ~59 Ma), and (g) DOM 19034 (with a CRE age of ~43 Ma). There are three distinct age groupings of 3.00–3.05 COs, highlighting the diverse pristine CO3 materials present in the DOM area. There is one large MIL pairing group (MIL 07099; n = 199; 9–14 Ma CRE age where measured) and one smaller pairing group with distinctly lower Cr2O3 in type II olivines (8 samples of unknown CRE age), and five unpaired or unique CO3s. Notably, the large DOM and MIL pairing groups have 9–16 Ma exposure ages that could have been delivered in a single large fall event spanning ~200 km, two separate falls that were ejection paired, or two separate falls from two separate ejections. Finally, we recommend reclassifying several CO3 to CM2 based on new data and that from previous studies.

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“…Ca-Al-rich inclusions (CAIs) in meteorites are the oldest objects formed in the solar system, with an average age of 4567.30 AE 0.16 Ma (Connelly et al, 2012). Fine-grained CAIs (FGIs) are thought to be condensates from the solar nebular gas, based on volatility-fractionated Group II rare earth element (REE) patterns (Boynton, 1975;Davis & Grossman, 1979), the mineral assemblages, and their complex layered structures (Han & Brearley, 2017;Han et al, 2015Han et al, , 2019Itoh et al, 2004;Krot et al, 2004;Wada et al, 2020;Wark & Lovering, 1977). FGIs are aggregates of high-temperature condensate minerals and thus provide clues for understanding the evolution of the earliest solar system.…”

Section: Introductionmentioning

confidence: 99%

²⁶Al–²⁶Mg chronology of high‐temperature condensate hibonite in a fine‐grained, Ca‐Al‐rich inclusion from reduced CV chondrite

Kawasaki

Yamamoto

Wada

et al. 2023

Meteorit & Planetary Scien

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Al–Mg mineral isochron studies using secondary ion mass spectrometry (SIMS) have revealed the initial 26Al/27Al ratios, (26Al/27Al)0, for individual Ca‐Al‐rich inclusions (CAIs) in meteorites. We find that the relative sensitivity factors of 27Al/24Mg ratio for SIMS analysis of hibonite, one of the major constituent minerals of CAIs, exhibit variations based on their chemical compositions. This underscores the critical need for using appropriate hibonite standards to obtain accurate Al−Mg data. We measured the Al−Mg mineral isochron for hibonite in a fine‐grained CAI (FGI) from the Northwest Africa 8613 reduced CV chondrite by SIMS using synthesized hibonite standards with 27Al/24Mg of ~30, ~100, and ~400. The obtained mineral isochron of hibonite in the FGI yields (26Al/27Al)0 of (4.73 ± 0.09) × 10−5, which is identical to that previously obtained from the mineral isochron of spinel and melilite in the same FGI (Kawasaki et al., 2020). The uncertainties of (26Al/27Al)0 indicate that the constituent minerals in the FGI formed within ~0.02 Myr in the earliest solar system. The disequilibrium O‐isotope distributions of the minerals in the FGI suggest that the O‐isotope compositions of the nebular gas from which they condensed underwent a transitional change from 16O‐rich to 16O‐poor within ~0.02 Myr in the earliest solar system. Once formed, the FGI may have been removed from the forming region within ~0.02 Myr and transported to the accretion region of the parent body.

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Origin of 16O-rich fine-grained Ca-Al-rich inclusions of different mineralogy and texture

Cited by 10 publications

References 48 publications

Atomic-scale structure and non-stoichiometry of meteoritic hibonite: A transmission electron microscope study

Atomic-scale structure and non-stoichiometry of meteoritic hibonite: A transmission electron microscope study

Pairing relations within CO3 chondrites recovered at the Dominion Range and Miller Range, Transantarctic mountains: Constraints from chondrule olivines, noble gas, and H, C, N bulk and isotopic compositions

²⁶Al–²⁶Mg chronology of high‐temperature condensate hibonite in a fine‐grained, Ca‐Al‐rich inclusion from reduced CV chondrite

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Origin of 16O-rich fine-grained Ca-Al-rich inclusions of different mineralogy and texture

Cited by 10 publications

References 48 publications

Atomic-scale structure and non-stoichiometry of meteoritic hibonite: A transmission electron microscope study

Atomic-scale structure and non-stoichiometry of meteoritic hibonite: A transmission electron microscope study

Pairing relations within CO3 chondrites recovered at the Dominion Range and Miller Range, Transantarctic mountains: Constraints from chondrule olivines, noble gas, and H, C, N bulk and isotopic compositions

26Al–26Mg chronology of high‐temperature condensate hibonite in a fine‐grained, Ca‐Al‐rich inclusion from reduced CV chondrite

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²⁶Al–²⁶Mg chronology of high‐temperature condensate hibonite in a fine‐grained, Ca‐Al‐rich inclusion from reduced CV chondrite