Solar system Nd isotope heterogeneity: Insights into nucleosynthetic components and protoplanetary disk evolution

Saji, Nikitha Susan; Wielandt, D.; Holst, Jesper Christian; Bizzarro, Martin

doi:10.1016/j.gca.2020.05.006

Cited by 18 publications

(14 citation statements)

References 41 publications

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“…Another pure p-process nuclide, 144 Sm, has shown large deficits in carbonaceous chondrites relative to terrestrial samples (32) and small excesses in a few enstatite chondrites (33), indicating that 144 Sm was heterogeneously distributed in the solar nebula. Also, the variations in 142 Nd, when corrected for the s-process heterogeneity to reflect the p-process variations only, positively correlate with those in 144 Sm in carbonaceous chondrites (34). In contrast, the combined 142 Nd-144 Sm data for noncarbonaceous materials overlap within error (34) in line with the initial 92 Nb/ 93 Nb ratios, which are identical for noncarbonaceous chondrites (H chondrites), eucrites, mesosiderites, angrites, and ungrouped achondrites (6, 7), indicating no resolved variations in 92 Nb in the inner Solar System (35).…”

Section: The Initial Abundance Of 92 Nb In the Solar Systemmentioning

confidence: 85%

Precise initial abundance of Niobium-92 in the Solar System and implications for p -process nucleosynthesis

Haba

Lai

Wotzlaw

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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The niobium-92–zirconium-92 (92Nb–92Zr) decay system with a half-life of 37 Ma has great potential to date the evolution of planetary materials in the early Solar System. Moreover, the initial abundance of the p-process isotope 92Nb in the Solar System is important for quantifying the contribution of p-process nucleosynthesis in astrophysical models. Current estimates of the initial 92Nb/93Nb ratios have large uncertainties compromising the use of the 92Nb–92Zr cosmochronometer and leaving nucleosynthetic models poorly constrained. Here, the initial 92Nb abundance is determined to high precision by combining the 92Nb–92Zr systematics of cogenetic rutiles and zircons from mesosiderites with U–Pb dating of the same zircons. The mineral pair indicates that the 92Nb/93Nb ratio of the Solar System started with (1.66 ± 0.10) × 10−5, and their 92Zr/90Zr ratios can be explained by a three-stage Nb–Zr evolution on the mesosiderite parent body. Because of the improvement by a factor of 6 of the precision of the initial Solar System 92Nb/93Nb, we can show that the presence of 92Nb in the early Solar System provides further evidence that both type Ia supernovae and core-collapse supernovae contributed to the light p-process nuclei.

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Section: The Initial Abundance Of 92 Nb In the Solar Systemmentioning

confidence: 85%

Precise initial abundance of Niobium-92 in the Solar System and implications for p -process nucleosynthesis

Haba

Lai

Wotzlaw

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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“… µ 145 Nd-µ 148 Nd compositions of EC 002 compared with the mean compositions of chondrite groups ( 22 , 24 , 25 , 40 ), achondrite groups ( 22 , 26 , 40 , 41 ), lunar samples ( 3 , 9 , 42 – 44 ), and martian meteorites ( 26 , 40 , 45 – 48 ). Compiled µ 145 Nd and µ 148 Nd of meteorite groups and planetary bodies are from Frossard et al.…”

Section: Discussionmentioning

confidence: 99%

Half-life and initial Solar System abundance of ¹⁴⁶ Sm determined from the oldest andesitic meteorite

Fang

Frossard

Boyet

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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Significance 146 Sm- 142 Nd radioactive systematics can provide constraints on the timing of early differentiation processes on Earth, Moon, and Mars. The uncertainties related to the initial abundance and half-life of the extinct isotope 146 Sm impede the interpretation of the 146 Sm- 142 Nd systematics of planetary materials. The accurate determinations of Sm, Nd, and Mg isotopic compositions of the oldest “andesitic” achondrite Erg Chech 002 (EC 002) define a crystallization age of 1.8 Myr after the formation of the Solar System and provide the most accurate and reliable initial ratio of 146 Sm/ 144 Sm for the Solar System at 0.00840 ± 0.00032 using a 146 Sm half-life of 103 Ma, making EC 002 an anchor for 146 Sm- 142 Nd systematics for Earth and planetary materials.

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“…for individual measurements and two-sided Student's t-values 95% confidence intervals for martian mantle average. (20,22,53), updated with recent publications (9,23,42,47,52,(54)(55)(56)(57)(58)(59)(60)(61)(62).…”

Section: Supplementary Materials Figures S1 To S3mentioning

confidence: 99%

Terrestrial planet formation from lost inner solar system material

et al. 2021

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Solar system Nd isotope heterogeneity: Insights into nucleosynthetic components and protoplanetary disk evolution

Cited by 18 publications

References 41 publications

Precise initial abundance of Niobium-92 in the Solar System and implications for p -process nucleosynthesis

Precise initial abundance of Niobium-92 in the Solar System and implications for p -process nucleosynthesis

Half-life and initial Solar System abundance of ¹⁴⁶ Sm determined from the oldest andesitic meteorite

Terrestrial planet formation from lost inner solar system material

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Solar system Nd isotope heterogeneity: Insights into nucleosynthetic components and protoplanetary disk evolution

Cited by 18 publications

References 41 publications

Precise initial abundance of Niobium-92 in the Solar System and implications for p -process nucleosynthesis

Precise initial abundance of Niobium-92 in the Solar System and implications for p -process nucleosynthesis

Half-life and initial Solar System abundance of 146 Sm determined from the oldest andesitic meteorite

Terrestrial planet formation from lost inner solar system material

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Product

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Half-life and initial Solar System abundance of ¹⁴⁶ Sm determined from the oldest andesitic meteorite