Sequential Chemical Separation of Cr and Ti from a Single Digest for High‐Precision Isotope Measurements of Planetary Materials

Hibiya, Yuki; Iizuka, Tsuyoshi; Yamashita, Katsuyuki; Yoneda, Shigekazu; Yamakawa, Akane

doi:10.1111/ggr.12249

Cited by 9 publications

(4 citation statements)

References 50 publications

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“…A 24 mg aliquot of this fraction was digested with a concentrated HF-HNO 3 mixture at 200 ˚C using a Parr bomb ® The digested sample was converted to a soluble form by repeated evaporation with concentrated HNO 3 , and dissolved in 6 M HCl. The chemical separation of Ti was performed following the procedure described by 71 . First, the sample in 6 M HCl was loaded onto the column packed with Bio-Rad AG1-X8 anion exchange resin (200-400 mesh), in which Ti is eluted while Fe and U are retained by the resin.…”

Section: Uranium Isotope Analysis Methods and Resultsmentioning

confidence: 99%

U-Pb age of the oldest achondrite points to 26Al heterogeneity in the early Solar System

Krestianinov

Amelin²,

Yin

et al. 2022

Preprint

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The homogeneity of distribution of radioisotope 26Al in the early solar nebula, a major heat source for early planetary differentiation and foundational assumption to high resolution cosmochronology, remains debatable. Here we report a precise Pb-isotopic age of 4565.56±0.12 million years (Ma) for the recently discovered andesitic achondrite Erg Chech 002. Combining this age with published high-precision 26Al-26Mg data, we demonstrate that the initial 26Al/27Al in the source material of this achondrite was distinctly higher than in several well preserved and precisely dated achondrites. We argue that the current data clearly indicate spatial heterogeneity of 26Al in the precursor molecular cloud or the protoplanetary disk of the Solar System, likely associated with the late infall of stellar materials with freshly synthesized radionuclides.

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Section: Uranium Isotope Analysis Methods and Resultsmentioning

confidence: 99%

U-Pb age of the oldest achondrite points to 26Al heterogeneity in the early Solar System

Krestianinov

Amelin²,

Yin

et al. 2022

Preprint

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“…The Cr isotopic anomalies of individual CCs were determined by high-precision isotope ratio measurements with a multi-collector-type mass spectrometer. Subgroups of CCs are well discriminated within each other based on the isotope data (Shukolyukov & Lugmair 2006;Trinquier et al 2007;Qin et al 2010;Larsen et al 2011;Petitat et al 2011;Jenniskens et al 2012;Hibiya et al 2018). Table 1 shows the data of the Cr isotopic anomalies for the meteorite groups discussed earlier (i.e., CI, CM, C2-ungrouped, and CV).…”

Section: Classification Of Meteorites and Asteroidsmentioning

confidence: 93%

Assessment of Cr Isotopic Heterogeneities of Volatile-rich Asteroids Based on Multiple Planet Formation Models

Fukai

Arakawa

2021

ApJ

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Describing the comprehensive evolutionary scenario for asteroids is key to explaining the various physical processes of the solar system. Bulk-scale carbonaceous chondrites (CCs) possibly record the primordial information associated with the formation processes of their parent bodies. In this study, we tried to estimate the relative formation region of volatile-rich asteroids by utilizing the nucleosynthetic Cr isotopic variation ( 54 Cr/ 52 Cr) in bulk-scale CCs.Numerical calculations were conducted to track the temporal evolution of isotopically different (solar and presolar) dust and 54 Cr/ 52 Cr values for mixed materials with disk radius.First, we found that isotopic heterogeneities in CC formation regions would be preserved with a weak turbulence setting that would increase the timescales of the advection and diffusion in the disk. Second, we assessed the effects of gaps formed by giant planets. Finally, the distance from the injected supernovae and Cr isotopic compositions of the presolar grains were investigated in terms of the estimated formation region of CCs. In our results, a plausible formation region of four types of CCs can be obtained with the supernova from approximately 2 pc and typical Cr isotopic compositions of presolar grains. Among the parent bodies of CCs (i.e., volatile-rich asteroids), B-type asteroids formed in the outermost region, which is inconsistent with the present population, showing that D-type asteroids are generally located beyond most of the C-complex asteroids. Both the initial and present orbits of asteroids might be explained by the scatter attributed to the inward-outward migration of Jupiter and Saturn.

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“…The digested sample was converted to a soluble form by repeated evaporation with concentrated HNO 3 and dissolved in 6 M HCl. The chemical separation of Ti was performed following the procedure described by 69 . First, the sample in 6 M HCl was loaded onto the column packed with Bio-Rad AG1-X8 anion exchange resin (200-400 mesh), in which Ti is eluted while Fe and U are retained by the resin.…”

Section: Methodsmentioning

confidence: 99%

Igneous meteorites suggest Aluminium-26 heterogeneity in the early Solar Nebula

Krestianinov,

Amelin,

Yin

et al. 2023

Nat Commun

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The short-lived radionuclide aluminium-26 (26Al) isotope is a major heat source for early planetary melting. The aluminium-26 – magnesium-26 (26Al-26Mg) decay system also serves as a high-resolution relative chronometer. In both cases, however, it is critical to establish whether 26Al was homogeneously or heterogeneously distributed throughout the solar nebula. Here we report a precise lead-207 – lead-206 (207Pb-206Pb) isotopic age of 4565.56 ± 0.12 million years (Ma) for the andesitic achondrite Erg Chech 002. Our analysis, in conjunction with published 26Al-26Mg data, reveals that the initial 26Al/27Al in the source material of this achondrite was notably higher than in various other well-preserved and precisely dated achondrites. Here we demonstrate that the current data clearly indicate spatial heterogeneity of 26Al by a factor of 3-4 in the precursor molecular cloud or the protoplanetary disk of the Solar System, likely associated with the late infall of stellar materials with freshly synthesized radionuclides.

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Sequential Chemical Separation of Cr and Ti from a Single Digest for High‐Precision Isotope Measurements of Planetary Materials

Cited by 9 publications

References 50 publications

U-Pb age of the oldest achondrite points to 26Al heterogeneity in the early Solar System

U-Pb age of the oldest achondrite points to 26Al heterogeneity in the early Solar System

Assessment of Cr Isotopic Heterogeneities of Volatile-rich Asteroids Based on Multiple Planet Formation Models

Igneous meteorites suggest Aluminium-26 heterogeneity in the early Solar Nebula

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