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...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2023-06-01
|
| Series: | Geochemistry, Geophysics, Geosystems |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2023GC010926 |
| _version_ | 1797638036698169344 |
|---|---|
| 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 |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-11T12:57:54Z |
| format | Article |
| id | doaj.art-cd2af81a91ac479fbb1d787564d0aa88 |
| institution | Directory Open Access Journal |
| issn | 1525-2027 |
| language | English |
| last_indexed | 2024-03-11T12:57:54Z |
| publishDate | 2023-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj.art-cd2af81a91ac479fbb1d787564d0aa882023-11-03T16:56:13ZengWileyGeochemistry, Geophysics, Geosystems1525-20272023-06-01246n/an/a10.1029/2023GC010926Nickel Isotope Fractionation During Magmatic DifferentiationXi‐Ming Yang0Shui‐Jiong Wang1Ya‐Wen Zhang2Xu‐Han Dong3Fang‐Zhen Teng4Rosalind T. Helz5Jian Huang6Xian‐Hua Li7Shichun Huang8State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences (Beijing) Beijing ChinaState Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences (Beijing) Beijing ChinaState Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences (Beijing) Beijing ChinaState Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences (Beijing) Beijing ChinaIsotope Laboratory Department of Earth and Space Sciences The University of Washington Seattle WA USAUnited States Geological Survey Reston VA USACAS Key Laboratory of Crust‐Mantle Materials and Environments School of Earth and Space Sciences University of Science and Technology of China Hefei ChinaState Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaDepartment of Earth and Planetary University of Tennessee Knoxville TN USAAbstract 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.https://doi.org/10.1029/2023GC010926magmatic differentiationnickel isotopenon‐traditional isotopecontinental crust |
| spellingShingle | 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 Geochemistry, Geophysics, Geosystems magmatic differentiation nickel isotope non‐traditional isotope continental crust |
| title | 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_short | Nickel Isotope Fractionation During Magmatic Differentiation |
| title_sort | nickel isotope fractionation during magmatic differentiation |
| topic | magmatic differentiation nickel isotope non‐traditional isotope continental crust |
| url | https://doi.org/10.1029/2023GC010926 |
| work_keys_str_mv | AT ximingyang nickelisotopefractionationduringmagmaticdifferentiation AT shuijiongwang nickelisotopefractionationduringmagmaticdifferentiation AT yawenzhang nickelisotopefractionationduringmagmaticdifferentiation AT xuhandong nickelisotopefractionationduringmagmaticdifferentiation AT fangzhenteng nickelisotopefractionationduringmagmaticdifferentiation AT rosalindthelz nickelisotopefractionationduringmagmaticdifferentiation AT jianhuang nickelisotopefractionationduringmagmaticdifferentiation AT xianhuali nickelisotopefractionationduringmagmaticdifferentiation AT shichunhuang nickelisotopefractionationduringmagmaticdifferentiation |