Nickel Isotope Fractionation During Magmatic Differentiation
Abstract The behavior of nickel (Ni) isotopes during magmatic differentiation is not adequately explored. Here, we find that tholeiitic rocks in the Kīlauea Iki (KI) lava lake, Hawai'i, show progressively lighter Ni isotopic compositions with increasing magmatic differentiation, whereas calc‐al...
Published in: | Viatica |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2023
|
Subjects: | |
Online Access: | https://doi.org/10.1029/2023GC010926 https://doaj.org/article/cd2af81a91ac479fbb1d787564d0aa88 |
id |
ftdoajarticles:oai:doaj.org/article:cd2af81a91ac479fbb1d787564d0aa88 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:cd2af81a91ac479fbb1d787564d0aa88 2023-12-03T10:25:14+01:00 Nickel Isotope Fractionation During Magmatic Differentiation Xi‐Ming Yang Shui‐Jiong Wang Ya‐Wen Zhang Xu‐Han Dong Fang‐Zhen Teng Rosalind T. Helz Jian Huang Xian‐Hua Li Shichun Huang 2023-06-01T00:00:00Z https://doi.org/10.1029/2023GC010926 https://doaj.org/article/cd2af81a91ac479fbb1d787564d0aa88 EN eng Wiley https://doi.org/10.1029/2023GC010926 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2023GC010926 https://doaj.org/article/cd2af81a91ac479fbb1d787564d0aa88 Geochemistry, Geophysics, Geosystems, Vol 24, Iss 6, Pp n/a-n/a (2023) magmatic differentiation nickel isotope non‐traditional isotope continental crust Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.1029/2023GC010926 2023-11-05T01:35:57Z Abstract The behavior of nickel (Ni) isotopes during magmatic differentiation is not adequately explored. Here, we find that tholeiitic rocks in the Kīlauea Iki (KI) lava lake, Hawai'i, show progressively lighter Ni isotopic compositions with increasing magmatic differentiation, whereas calc‐alkaline rocks from the thick Kamchatka arc (30–45 km), located at the convergent boundary of the Eurasian and Pacific plates show increasing Ni isotope values as MgO and Ni decrease. Forty‐three global intermediate‐felsic continental igneous rocks analyzed in this study display large Ni isotopic variations, with the Eoarchean samples having light Ni isotopic compositions that fall in the trend defined by the KI lavas, and the post‐Eoarchean samples showing systematically heavier Ni isotopic compositions overlapping those of Kamchatka arc rocks. The isotopic dichotomy results from the crystallization of isotopically heavy magnetite during low‐pressure differentiation of KI lavas, whereas the participation of sulfide separation that removes isotopically light Ni during high‐pressure differentiation of magmas traversing thick continental crust. Combined with Rhyolite‐MELTS and sulfur concentration at sulfide saturation simulations, we demonstrate that the Ni isotope fractionation during magmatic differentiation is mainly controlled by the tempo of magnetite crystallization and sulfide formation, which is a function of pressure, oxygen fugacity, and water activity. High‐pressure calc‐alkaline differentiation usually suppresses magnetite crystallization while stabilizing sulfide, leading to heavy Ni isotopic compositions for the evolved magmas, significantly deviating from the low‐pressure fractionation trend seen in the KI lavas. Ni isotopes can be used in the future as a tracer of magmatic differentiation and processes of continent formation and differentiation. Article in Journal/Newspaper Kamchatka Directory of Open Access Journals: DOAJ Articles Lava Lake ENVELOPE(-128.996,-128.996,55.046,55.046) Pacific Viatica 7 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
magmatic differentiation nickel isotope non‐traditional isotope continental crust Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
spellingShingle |
magmatic differentiation nickel isotope non‐traditional isotope continental crust Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 Xi‐Ming Yang Shui‐Jiong Wang Ya‐Wen Zhang Xu‐Han Dong Fang‐Zhen Teng Rosalind T. Helz Jian Huang Xian‐Hua Li Shichun Huang Nickel Isotope Fractionation During Magmatic Differentiation |
topic_facet |
magmatic differentiation nickel isotope non‐traditional isotope continental crust Geophysics. Cosmic physics QC801-809 Geology QE1-996.5 |
description |
Abstract The behavior of nickel (Ni) isotopes during magmatic differentiation is not adequately explored. Here, we find that tholeiitic rocks in the Kīlauea Iki (KI) lava lake, Hawai'i, show progressively lighter Ni isotopic compositions with increasing magmatic differentiation, whereas calc‐alkaline rocks from the thick Kamchatka arc (30–45 km), located at the convergent boundary of the Eurasian and Pacific plates show increasing Ni isotope values as MgO and Ni decrease. Forty‐three global intermediate‐felsic continental igneous rocks analyzed in this study display large Ni isotopic variations, with the Eoarchean samples having light Ni isotopic compositions that fall in the trend defined by the KI lavas, and the post‐Eoarchean samples showing systematically heavier Ni isotopic compositions overlapping those of Kamchatka arc rocks. The isotopic dichotomy results from the crystallization of isotopically heavy magnetite during low‐pressure differentiation of KI lavas, whereas the participation of sulfide separation that removes isotopically light Ni during high‐pressure differentiation of magmas traversing thick continental crust. Combined with Rhyolite‐MELTS and sulfur concentration at sulfide saturation simulations, we demonstrate that the Ni isotope fractionation during magmatic differentiation is mainly controlled by the tempo of magnetite crystallization and sulfide formation, which is a function of pressure, oxygen fugacity, and water activity. High‐pressure calc‐alkaline differentiation usually suppresses magnetite crystallization while stabilizing sulfide, leading to heavy Ni isotopic compositions for the evolved magmas, significantly deviating from the low‐pressure fractionation trend seen in the KI lavas. Ni isotopes can be used in the future as a tracer of magmatic differentiation and processes of continent formation and differentiation. |
format |
Article in Journal/Newspaper |
author |
Xi‐Ming Yang Shui‐Jiong Wang Ya‐Wen Zhang Xu‐Han Dong Fang‐Zhen Teng Rosalind T. Helz Jian Huang Xian‐Hua Li Shichun Huang |
author_facet |
Xi‐Ming Yang Shui‐Jiong Wang Ya‐Wen Zhang Xu‐Han Dong Fang‐Zhen Teng Rosalind T. Helz Jian Huang Xian‐Hua Li Shichun Huang |
author_sort |
Xi‐Ming Yang |
title |
Nickel Isotope Fractionation During Magmatic Differentiation |
title_short |
Nickel Isotope Fractionation During Magmatic Differentiation |
title_full |
Nickel Isotope Fractionation During Magmatic Differentiation |
title_fullStr |
Nickel Isotope Fractionation During Magmatic Differentiation |
title_full_unstemmed |
Nickel Isotope Fractionation During Magmatic Differentiation |
title_sort |
nickel isotope fractionation during magmatic differentiation |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1029/2023GC010926 https://doaj.org/article/cd2af81a91ac479fbb1d787564d0aa88 |
long_lat |
ENVELOPE(-128.996,-128.996,55.046,55.046) |
geographic |
Lava Lake Pacific |
geographic_facet |
Lava Lake Pacific |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
Geochemistry, Geophysics, Geosystems, Vol 24, Iss 6, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2023GC010926 https://doaj.org/toc/1525-2027 1525-2027 doi:10.1029/2023GC010926 https://doaj.org/article/cd2af81a91ac479fbb1d787564d0aa88 |
op_doi |
https://doi.org/10.1029/2023GC010926 |
container_title |
Viatica |
container_issue |
7 |
_version_ |
1784274001314447360 |