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Oxygen Fugacity Evolution of the Mantle Lithosphere Beneath the North China Craton
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  • Ji-Feng Ying,
  • Chen-Yang Ye,
  • Yanjie Tang,
  • XinMiao Zhao,
  • Hongfu Zhang
Ji-Feng Ying
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences

Corresponding Author:[email protected]

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Chen-Yang Ye
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences
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Yanjie Tang
Insitute of Geology and Geophysics, Chinese Academy of Sciences
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XinMiao Zhao
Institute of Geology and Geophysics, Chinese Academy of Sciences
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Hongfu Zhang
institute of geology and geophysics, CAS
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Abstract

Oxygen fugacity controls the behavior of multivalent elements and compositions of C-O-H fluids in Earth’s mantle, which further affects the cycling of materials between the deep interior and surface of Earth. The redox state of mantle lithosphere of typical stable cratons has been well documented, but how oxygen fugacity had varied during craton destruction remains unclear. This study estimates the oxygen fugacity of peridotite xenoliths entrained in Mesozoic and Cenozoic basalts on North China Craton (NCC), a typical destroyed craton. The results reveal that the mantle lithosphere beneath the NCC experienced three stages of evolution in terms of oxygen fugacity. First, the refractory and oxidized peridotite xenoliths indicate the lithospheric mantle experienced a high degree of melt extraction and later long-term and complicated metasomatism before craton destruction. Then, the variations of olivine Mg-number in peridotites and oxygen fugacity reveal significant metasomatism by melts originated from the shallow asthenosphere during the destruction of the NCC since the Mesozoic. The third stage may have occurred when mantle peridotites interacted with silica-undersaturated melts stemmed from the mantle transition zone where the stagnant Pacific slab underlies. This study further verifies that the asthenospheric convection induced by the roll-back of the subducted paleo-Pacific slab played a crucial role in the destruction of the NCC and helps understand the oxygen fugacity variability during the later life of the craton.