Calcium Isotope Evolution During Differentiation of Vesta and Calcium Isotopic Heterogeneities in the Inner Solar System

Ke Zhu; Hejiu Hui; Martijn Klaver; Shi Jie Li; Lu Chen; Weibiao Hsu

doi:10.1029/2022GL102179

Calcium Isotope Evolution During Differentiation of Vesta and Calcium Isotopic Heterogeneities in the Inner Solar System

Ke Zhu^*, Hejiu Hui, Martijn Klaver, Shi Jie Li, Lu Chen, Weibiao Hsu^*

^*Corresponding author for this work

School of Earth Sciences

Research output: Contribution to journal › Article (Academic Journal) › peer-review

5 Citations (Scopus)

Abstract

We employed MC-ICP-MS to measure the mass-dependent Ca isotope compositions of Vesta-related meteorites. Eucrites and diogenites show distinct Ca isotope compositions, which is caused by crystallization of isotopically heavy orthopyroxene. The Ca isotope data support a model where the two lithologies are linked, where the diogenites, mainly composed of orthopyroxene crystallized from an eucritic melt. As normal eucrites are the main Ca reservoir on Vesta, their δ^44/40Ca values (per mil ⁴⁴Ca/⁴⁰Ca ratios relative to NIST 915a) best represents that of bulk silicate Vesta (0.83 ± 0.04‰). This value is different from those of bulk Earth (0.94 ± 0.05‰) and Mars (1.04 ± 0.07‰), suggesting that there exists notable Ca isotope heterogeneity between inner solar system bodies. The δ^44/40Ca difference between chondrules and these planets does not support the pebble accretion model as the main mechanism for planetary growth.

Original language	English
Article number	e2022GL102179
Journal	Geophysical Research Letters
Volume	50
Issue number	4
DOIs	https://doi.org/10.1029/2022GL102179
Publication status	Published - 28 Feb 2023

Bibliographical note

Funding Information:
This work was supported by National Key Research and Development Program of China (2021YFA0716100), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant XDB 41000000), and the National Natural Science Foundation of China (Grant 41973060), Civil Aerospace pre-research projects (D020202 and D020302), and the Minor Planet Foundation of China. K. Z. and M. K. thank postdoc fellowships from Alexander von Humboldt Foundation. K. Z. also thanks a UK STFC grant (Grant ST/V000888/1). Sheng Shang and Dehan Shen are acknowledged for preparing the samples. The authors appreciate efficient editorial handling of Andrew Dombard and constructive comments from Zoltan Vaci and an anonymous reviewer. Discussion with James Day, Jamie Lewis, and Michael Antonelli also largely improved this manuscript.

Funding Information:
This work was supported by National Key Research and Development Program of China (2021YFA0716100), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant XDB 41000000), and the National Natural Science Foundation of China (Grant 41973060), Civil Aerospace pre‐research projects (D020202 and D020302), and the Minor Planet Foundation of China. K. Z. and M. K. thank postdoc fellowships from Alexander von Humboldt Foundation. K. Z. also thanks a UK STFC grant (Grant ST/V000888/1). Sheng Shang and Dehan Shen are acknowledged for preparing the samples. The authors appreciate efficient editorial handling of Andrew Dombard and constructive comments from Zoltan Vaci and an anonymous reviewer. Discussion with James Day, Jamie Lewis, and Michael Antonelli also largely improved this manuscript.

Publisher Copyright:
© 2023. The Authors.

Keywords

Ca isotopes
chondrules
isotope heterogeneities
magmatic evolution
Vesta

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title = "Calcium Isotope Evolution During Differentiation of Vesta and Calcium Isotopic Heterogeneities in the Inner Solar System",

abstract = "We employed MC-ICP-MS to measure the mass-dependent Ca isotope compositions of Vesta-related meteorites. Eucrites and diogenites show distinct Ca isotope compositions, which is caused by crystallization of isotopically heavy orthopyroxene. The Ca isotope data support a model where the two lithologies are linked, where the diogenites, mainly composed of orthopyroxene crystallized from an eucritic melt. As normal eucrites are the main Ca reservoir on Vesta, their δ44/40Ca values (per mil 44Ca/40Ca ratios relative to NIST 915a) best represents that of bulk silicate Vesta (0.83 ± 0.04‰). This value is different from those of bulk Earth (0.94 ± 0.05‰) and Mars (1.04 ± 0.07‰), suggesting that there exists notable Ca isotope heterogeneity between inner solar system bodies. The δ44/40Ca difference between chondrules and these planets does not support the pebble accretion model as the main mechanism for planetary growth.",

keywords = "Ca isotopes, chondrules, isotope heterogeneities, magmatic evolution, Vesta",

author = "Ke Zhu and Hejiu Hui and Martijn Klaver and Li, {Shi Jie} and Lu Chen and Weibiao Hsu",

note = "Funding Information: This work was supported by National Key Research and Development Program of China (2021YFA0716100), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant XDB 41000000), and the National Natural Science Foundation of China (Grant 41973060), Civil Aerospace pre-research projects (D020202 and D020302), and the Minor Planet Foundation of China. K. Z. and M. K. thank postdoc fellowships from Alexander von Humboldt Foundation. K. Z. also thanks a UK STFC grant (Grant ST/V000888/1). Sheng Shang and Dehan Shen are acknowledged for preparing the samples. The authors appreciate efficient editorial handling of Andrew Dombard and constructive comments from Zoltan Vaci and an anonymous reviewer. Discussion with James Day, Jamie Lewis, and Michael Antonelli also largely improved this manuscript. Funding Information: This work was supported by National Key Research and Development Program of China (2021YFA0716100), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant XDB 41000000), and the National Natural Science Foundation of China (Grant 41973060), Civil Aerospace pre‐research projects (D020202 and D020302), and the Minor Planet Foundation of China. K. Z. and M. K. thank postdoc fellowships from Alexander von Humboldt Foundation. K. Z. also thanks a UK STFC grant (Grant ST/V000888/1). Sheng Shang and Dehan Shen are acknowledged for preparing the samples. The authors appreciate efficient editorial handling of Andrew Dombard and constructive comments from Zoltan Vaci and an anonymous reviewer. Discussion with James Day, Jamie Lewis, and Michael Antonelli also largely improved this manuscript. Publisher Copyright: {\textcopyright} 2023. The Authors.",

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T1 - Calcium Isotope Evolution During Differentiation of Vesta and Calcium Isotopic Heterogeneities in the Inner Solar System

AU - Zhu, Ke

AU - Hui, Hejiu

AU - Klaver, Martijn

AU - Li, Shi Jie

AU - Chen, Lu

AU - Hsu, Weibiao

N1 - Funding Information: This work was supported by National Key Research and Development Program of China (2021YFA0716100), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant XDB 41000000), and the National Natural Science Foundation of China (Grant 41973060), Civil Aerospace pre-research projects (D020202 and D020302), and the Minor Planet Foundation of China. K. Z. and M. K. thank postdoc fellowships from Alexander von Humboldt Foundation. K. Z. also thanks a UK STFC grant (Grant ST/V000888/1). Sheng Shang and Dehan Shen are acknowledged for preparing the samples. The authors appreciate efficient editorial handling of Andrew Dombard and constructive comments from Zoltan Vaci and an anonymous reviewer. Discussion with James Day, Jamie Lewis, and Michael Antonelli also largely improved this manuscript. Funding Information: This work was supported by National Key Research and Development Program of China (2021YFA0716100), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant XDB 41000000), and the National Natural Science Foundation of China (Grant 41973060), Civil Aerospace pre‐research projects (D020202 and D020302), and the Minor Planet Foundation of China. K. Z. and M. K. thank postdoc fellowships from Alexander von Humboldt Foundation. K. Z. also thanks a UK STFC grant (Grant ST/V000888/1). Sheng Shang and Dehan Shen are acknowledged for preparing the samples. The authors appreciate efficient editorial handling of Andrew Dombard and constructive comments from Zoltan Vaci and an anonymous reviewer. Discussion with James Day, Jamie Lewis, and Michael Antonelli also largely improved this manuscript. Publisher Copyright: © 2023. The Authors.

PY - 2023/2/28

Y1 - 2023/2/28

N2 - We employed MC-ICP-MS to measure the mass-dependent Ca isotope compositions of Vesta-related meteorites. Eucrites and diogenites show distinct Ca isotope compositions, which is caused by crystallization of isotopically heavy orthopyroxene. The Ca isotope data support a model where the two lithologies are linked, where the diogenites, mainly composed of orthopyroxene crystallized from an eucritic melt. As normal eucrites are the main Ca reservoir on Vesta, their δ44/40Ca values (per mil 44Ca/40Ca ratios relative to NIST 915a) best represents that of bulk silicate Vesta (0.83 ± 0.04‰). This value is different from those of bulk Earth (0.94 ± 0.05‰) and Mars (1.04 ± 0.07‰), suggesting that there exists notable Ca isotope heterogeneity between inner solar system bodies. The δ44/40Ca difference between chondrules and these planets does not support the pebble accretion model as the main mechanism for planetary growth.

AB - We employed MC-ICP-MS to measure the mass-dependent Ca isotope compositions of Vesta-related meteorites. Eucrites and diogenites show distinct Ca isotope compositions, which is caused by crystallization of isotopically heavy orthopyroxene. The Ca isotope data support a model where the two lithologies are linked, where the diogenites, mainly composed of orthopyroxene crystallized from an eucritic melt. As normal eucrites are the main Ca reservoir on Vesta, their δ44/40Ca values (per mil 44Ca/40Ca ratios relative to NIST 915a) best represents that of bulk silicate Vesta (0.83 ± 0.04‰). This value is different from those of bulk Earth (0.94 ± 0.05‰) and Mars (1.04 ± 0.07‰), suggesting that there exists notable Ca isotope heterogeneity between inner solar system bodies. The δ44/40Ca difference between chondrules and these planets does not support the pebble accretion model as the main mechanism for planetary growth.

KW - Ca isotopes

KW - chondrules

KW - isotope heterogeneities

KW - magmatic evolution

KW - Vesta

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U2 - 10.1029/2022GL102179

DO - 10.1029/2022GL102179

M3 - Article (Academic Journal)

AN - SCOPUS:85148854477

SN - 0094-8276

VL - 50

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 4

M1 - e2022GL102179

ER -

Calcium Isotope Evolution During Differentiation of Vesta and Calcium Isotopic Heterogeneities in the Inner Solar System

Abstract

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Keywords

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