The subarctic North Atlantic Ocean has experienced a complex and gradual magmatic evolution, including continental breakup, mature seafloor spreading, and episodic ridge jumps. Here, we present new in situ major-element, trace-element, and Sr isotopic compositions for minerals (olivine, clinopyroxene, and plagioclase) from the Jan Mayen microcontinent (Integrated Ocean Drilling Program [IODP] Sites 907 and 985), Reykjanes Ridge (Site 983), Greenland Basin (Site 913), and Knipovich Ridge (Site 911) volcanic samples in the Arctic Atlantic Ocean. The Jan Mayen hotspot−type and Iceland plume−type volcanic rocks have a common magma source. The former were likely derived from the latter by further fractional crystallization, resulting in their distinct geochemical features. The in situ incompatible element and isotopic compositions show that the normal mid-ocean-ridge basalt spreading ridge feature for the older (>14 Ma) system and the enriched plume feature for the younger (1.521 Ma and 1.049 Ma) system likely indicate plume-ridge interaction and the evolution from mid-ocean-ridge−type to plume-type magmatism beneath the Norwegian−Greenland Sea. The disequilibrium of Sr isotopes in plagioclase among the groundmass, phenocryst cores, and rims is likely due to heterogeneous compositions beneath the North Atlantic Ocean basin, with the contamination of thick continental crust and the influence of H2O-enriched melts originating from the deep Iceland plume.
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Research Article|
March 17, 2023
Tectono-magmatic evolution of the Greenland−Iceland−Norway ridge complex and the Jan Mayen hotspot in the Arctic Atlantic Ocean: Constraints from in situ trace elements and Sr isotopes of minerals
Shuang-Shuang Chen;
Shuang-Shuang Chen
1
School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China2
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China3
Guangdong Provincial Key Lab of Geological Processes and Mineral Resources, Guangzhou 510275, China4
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiang’an District, Xiamen 361102, China
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Rui Gao;
Rui Gao
1
School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China2
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China5
State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
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Jian-Ping Zheng;
Jian-Ping Zheng
6
State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
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Jia-Qi Liu
Jia-Qi Liu
7
Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
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Shuang-Shuang Chen
1
School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China2
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China3
Guangdong Provincial Key Lab of Geological Processes and Mineral Resources, Guangzhou 510275, China4
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiang’an District, Xiamen 361102, China
Rui Gao
1
School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China2
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China5
State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
Jian-Ping Zheng
6
State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
Jia-Qi Liu
7
Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Publisher: Geological Society of America
Received:
18 Mar 2022
Revision Received:
27 Nov 2022
Accepted:
24 Jan 2023
First Online:
17 Mar 2023
Online ISSN: 1943-2674
Print ISSN: 0016-7606
© 2023 Geological Society of America
GSA Bulletin (2023)
Article history
Received:
18 Mar 2022
Revision Received:
27 Nov 2022
Accepted:
24 Jan 2023
First Online:
17 Mar 2023
Citation
Shuang-Shuang Chen, Rui Gao, Jian-Ping Zheng, Jia-Qi Liu; Tectono-magmatic evolution of the Greenland−Iceland−Norway ridge complex and the Jan Mayen hotspot in the Arctic Atlantic Ocean: Constraints from in situ trace elements and Sr isotopes of minerals. GSA Bulletin 2023; doi: https://doi.org/10.1130/B36519.1
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