Geochemical and thermodynamic constraints on Archean comagmatic volcanic and cumulate rocks from southern West Greenland

Zhang, Lingyu; Hyde, William R.; Kirkland, Christopher L.; Han, Yue-Sheng; Szilas, Kristoffer

doi:10.1016/j.gca.2023.03.005

Cited by 3 publications

(1 citation statement)

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“…Bulk-rock major and trace elements, mineral major elements, HSEs, and Re-Os isotopic analysis Analytical methods for HSEs (here including Re + five PGEs: Os, Ir, Ru, Pt, and Pd) and Re-Os isotopes (analyzed at CUGB) are described in detail in (34), while those for some related bulk-rock major and trace elements (analyzed at Washington State University; table S1), as well as mineral (e.g., olivine, amphibole, and chromite) major elements (analyzed at University of Copenhagen; table S3) involved in this work, are described in (74). The HSE concentrations and 187 Os/ 188 Os ratios of repeatedly measured reference materials UB-N (serpentinized lherzolite) and BHVO-2 (table S4) are also consistent with their accepted values (75) within uncertainties.…”

Section: Nickel Stable Isotopic Analysismentioning

confidence: 99%

Ni isotopes provide a glimpse of Earth’s pre-late-veneer mantle

Xu,

Szilas,

Zhang

et al. 2023

Sci. Adv.

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Moderately siderophile (e.g., Ni) and highly siderophile elements (HSEs) in the bulk silicate Earth (BSE) are believed to be partly or near-completely delivered by late accretion after the depletion caused by metallic core formation. However, the extent and rate of remixing of late-accreted materials that equilibrated with Earth’s pre-late-veneer mantle have long been debated. Observing evidence of this siderophile element-depleted pre-late-veneer mantle would provide powerful confirmation of this model of early mantle evolution. We find that the mantle source of the ~3.8-billion-year-old (Ga) Narssaq ultramafic cumulates from Southwest Greenland exhibits a subtle 60 Ni/ 58 Ni excess of ~0.05 per mil and contains a clear HSE deficiency of ~60% relative to the BSE. The intermediate Ni isotopic composition and HSE abundances of the ~3.8-Ga Narssaq mantle mark a transitional Eoarchean snapshot as the poorly mixed 3.8-Ga mantle containing elements of pre-late-veneer mantle material transitions to modern Earth’s mantle.

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Section: Nickel Stable Isotopic Analysismentioning

confidence: 99%