Stable chromium isotopic variations in peridotite mantle xenoliths: Metasomatism versus partial melting

Jerram, Matthew; Bonnand, Pierre; Harvey, Jason; Ionov, Dmitri A.; Halliday, Alex N.

doi:10.1016/j.gca.2021.10.022

Cited by 12 publications

(15 citation statements)

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“…Chromium stable isotopes have also been widely used to study planetary differentiation (Bonnand, Parkinson,& Anand, 2016; Bonnand et al., 2020; Bonnand & Halliday, 2018; Jerram et al., 2021; Shen et al., 2020; P. Sossi et al., 2018; Zhu et al., 2019; Zhu, Moynier, Schiller, & Bizzarro, 2020; Zhu, Moynier, Alexander, et al., 2021; Zhu, Moynier, Schiller, Alexander, Barrat, et al., 2021); however, there is a lack of Cr isotope data for ureilites. Previous Cr isotopic observation about similar Cr stable isotope compositions between chondrites and BSE and data from high pressure experiments have proved that Cr isotopes do not fractionate during core formation (Bonnand, Williams, et al., 2016; Schoenberg et al., 2008; Zhu et al., 2019; Zhu, Moynier, Schiller, Alexander, Barrat, et al., 2021), except for sulfur‐rich planets, that is, aubrites (Moynier et al., 2011; Zhu, Moynier, Schiller, Barrat, et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

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Nickel and Chromium Stable Isotopic Composition of Ureilites: Implications for the Earth's Core Formation and Differentiation of the Ureilite Parent Body

Zhu

Barrat

Yamaguchi

et al. 2022

Geophysical Research Letters

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We report the first Ni and Cr stable isotope data for ureilite meteorites that are the mantle residue of a carbon‐rich differentiated planet. Ureilites have similar Ni stable isotope compositions as chondrites, suggesting that the core‐mantle differentiation of ureilite parent body (UPB) did not fractionate Ni isotopes. Since the size of Earth is potentially larger than that of UPB; with diameter >690 km), resulting in higher temperatures at the core‐mantle boundary of Earth, it can be predicted that the terrestrial core formation may not directly cause Ni stable isotope fractionation. On the other hand, we also report high‐precision Cr stable isotope composition of ureilites, including one ureilitic trachyandesite (ALM‐A) that is enriched in lighter Cr stable isotopes relative to the main‐group ureilites, which suggests that the partial melting occurred on UPB. The globally heavy Cr in the UPB compared to chondrites can be caused by sulfur‐rich core formation processes.

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Section: Introductionmentioning

confidence: 99%

“…Chromium stable isotopes have also been widely used to study planetary differentiation (Bonnand, Parkinson,& Anand, 2016;Bonnand et al, 2020;Bonnand & Halliday, 2018;Jerram et al, 2021;Shen et al, 2020;P. Sossi et al, 2018;Zhu et al, 2019;Zhu, Moynier, Schiller, Alexander, Barrat, et al, 2021); however, there is a lack of Cr isotope data for ureilites.…”

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confidence: 99%

Nickel and Chromium Stable Isotopic Composition of Ureilites: Implications for the Earth's Core Formation and Differentiation of the Ureilite Parent Body

Zhu

Barrat

Yamaguchi

et al. 2022

Geophysical Research Letters

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“…The presented sample suite spans a large δ 53 Cr range of ∼1‰. In addition, there are two outstanding observations among the (meta-)serpentinites: (a) low-grade serpentinites with Cr <∼1,800 ppm have significantly higher δ 53 Cr values than those samples with Cr >1,800 ppm (Figure 2a), whereas there is no clear trend between Cr concentrations and δ 53 Cr values of mantle xenoliths (Jerram et al, 2022;Ping et al, 2022); (b) The studied Atg-serpentinites have lower average δ 53 Cr value by ∼0.08‰ than both low-grade serpentinites and Chl-harzburgites, regardless of whether the Cr contents are restricted to 1,800-4,000 ppm or not (Table 2; Figures 2b and 3). Notably, some meta-serpentinites yield low δ 53 Cr that are rarely found in low-grade serpentinite (Figure 2), and the obviously variable δ 53 Cr values of fluid-induced veins from −0.32 to −0.03‰ imply that prograde serpentinite devolatilization could produce resolvable Cr isotope fractionation.…”

Section: Discussionmentioning

confidence: 95%

“…Data sources: abyssal peridotites, Niu (2004); mantle peridotite xenoliths, Jerram et al. (2022) and Ping et al. (2022).…”

Section: Discussionmentioning

confidence: 99%

“…For example, studies on komatiite and basalt have revealed limited equilibrium Cr isotope fractionation during partial melting and magmatic evolution (δ 53 Cr variation <0.1‰, δ 53 Cr = [( 53 Cr/ 52 Cr) sample /( 53 Cr/ 52 Cr) SRM979 − 1] × 1,000; Bonnand et al., 2016, 2020; Jerram et al., 2020; Ma et al., 2022; Ping et al., 2022; Shen et al., 2018, 2020; Wagner et al., 2021). Investigations on mantle xenoliths found that melt percolation could lead to significant Cr isotope fractionation (Jerram et al., 2022; Xia et al., 2017). In contrast, Cr isotope behavior during metamorphism remains poorly constrained (Farkaš et al., 2013; Shen et al., 2015, 2021; Wang et al., 2016), as Cr 3+ is commonly thought to be immobile due to its low solubility in aqueous fluids.…”

Section: Introductionmentioning

confidence: 99%

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Chromium Isotope Behavior During Serpentinite Dehydration in Oceanic Subduction Zones

Xiong,

Chen,

Shen

et al. 2023

JGR Solid Earth

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Fluids released through the dehydration of serpentinite are rich in Cl‐, which enables the significant mobility of Cr in subduction zones. However, the Cr isotope behavior accompanying the mobility of Cr during serpentinite dehydration is still poorly constrained. Here, we report high‐precision Cr isotope data for a unique suite of serpentinites that represent metamorphic products at different depths in oceanic subduction zones. The low‐grade serpentinites affected by significant Cr loss during serpentinization exhibit remarkably higher δ53Cr, while samples with Cr contents > ∼1800 ppm typically preserve mantle‐like δ53Cr. Antigorite serpentinites have an average δ53Cr value of −0.17‰ ± 0.19‰ (n=12, 2SD), which is statistically lower than those of low‐grade serpentinite (‐0.05‰ ± 0.30‰, n=80, 2SD) and higher‐grade chlorite harzburgite (−0.10‰ ± 0.27‰, n=22, 2SD). This suggests that resolvable Cr isotope fractionation occurs during serpentinite dehydration, which is explained by the variability of Cr isotope behavior in the presence of Cl‐bearing fluids at different dehydration stages. No obvious Cr isotope fractionation was found during chlorite harzburgite dehydration, probably related to the limited Cr mobility in a Cl‐poor fluid. Other processes, such as melt extraction, external fluid influx and retrograde metamorphism, have negligible effects on the Cr isotope systematics of meta‐serpentinites. Fluids released by serpentinite dehydration may have a great effect on the Cr isotope heterogeneity of mantle wedge peridotites and arc magmas.

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New tools and new scales to study peridotites: Non-traditional stable isotopes in the mantle

Ionov,

Kang

2025

Treatise on Geochemistry

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Stable chromium isotopic variations in peridotite mantle xenoliths: Metasomatism versus partial melting

Cited by 12 publications

References 95 publications

Nickel and Chromium Stable Isotopic Composition of Ureilites: Implications for the Earth's Core Formation and Differentiation of the Ureilite Parent Body

Nickel and Chromium Stable Isotopic Composition of Ureilites: Implications for the Earth's Core Formation and Differentiation of the Ureilite Parent Body

Chromium Isotope Behavior During Serpentinite Dehydration in Oceanic Subduction Zones

New tools and new scales to study peridotites: Non-traditional stable isotopes in the mantle

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