Ni isotopes provide a glimpse of Earth's pre-late-veneer mantle
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Ni isotopes provide a glimpse of Earth's pre-late-veneer mantle. / Xu, Yong; Szilas, Kristoffer; Zhang, Lingyu; Zhu, Jian Ming; Wu, Guangliang; Zhang, Jie; Qin, Bin; Sun, Yao; Pearson, D. Graham; Liu, Jingao.
In: Science Advances, Vol. 9, No. 50, eadj2170, 2023.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Ni isotopes provide a glimpse of Earth's pre-late-veneer mantle
AU - Xu, Yong
AU - Szilas, Kristoffer
AU - Zhang, Lingyu
AU - Zhu, Jian Ming
AU - Wu, Guangliang
AU - Zhang, Jie
AU - Qin, Bin
AU - Sun, Yao
AU - Pearson, D. Graham
AU - Liu, Jingao
PY - 2023
Y1 - 2023
N2 - 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 60Ni/58Ni 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.
AB - 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 60Ni/58Ni 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.
U2 - 10.1126/sciadv.adj2170
DO - 10.1126/sciadv.adj2170
M3 - Journal article
C2 - 38100586
AN - SCOPUS:85179901421
VL - 9
JO - Science advances
JF - Science advances
SN - 2375-2548
IS - 50
M1 - eadj2170
ER -
ID: 377992654