High oxygen fugacity magma: implication for the destruction of the North China Craton

The mechanism of lithospheric removal and destruction of the North China Craton (NCC) has been hotly debated for decades. It is now generally accepted that the subduction of the (Paleo)-Pacific plate played an important role in this process. However, how the plate subduction contributed to the crato...

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Bibliographic Details
Published in:Acta geochimica 2020-04, Vol.39 (2), p.161-171
Main Authors: Zhang, Zhekun, Ling, Mingxing, Zhang, Lipeng, Sun, Saijun, Sun, Weidong
Format: Article
Language:English
Subjects:
Apatite
Asthenosphere
Cerium
Cratons
Cretaceous
Destruction
Earth and Environmental Science
Earth Sciences
Fluids
Fugacity
Geochemistry
Haematite
Hematite
Lava
Magma
Magnetite
Manganese
Mantle
Mesozoic
Ocean circulation
Original Article
Oxygen
Plates
Plates (tectonics)
Ratios
Subduction
Subduction (geology)
Subduction zones
Upwelling
Zircon
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Summary:The mechanism of lithospheric removal and destruction of the North China Craton (NCC) has been hotly debated for decades. It is now generally accepted that the subduction of the (Paleo)-Pacific plate played an important role in this process. However, how the plate subduction contributed to the craton destruction remains unclear. Here we report high oxygen fugacity ( f O 2 ) characteristics of the Yunmengshan granite, e.g., hematite–magnetite intergrowth supported by zircon Ce 4+ /Ce 3+ ratios and apatite Mn oxygen fugacity indicator. High f O 2 magmas are widely discovered in Late Mesozoic (160–130 Ma) adakitic rocks in central NCC. The origin of high f O 2 magma is likely related to the input of the “oxidized mantle components”, which shows a close connection between plate subduction and destruction of the craton. The research area is ~ 1500 km away from the current Pacific subduction zone. Considering the back-arc extension of Japan Sea since the Cretaceous, this distance may be shortened to ~ 800 km, which is still too far for normal plate subduction. Ridge subduction is the best candidate that was responsible for the large scale magmatism and the destruction of the NCC. Massive slab-derived fluids and/or melts were liberated into an overlying mantle wedge and modified the lithospheric mantle. Rollback of the subducting plate induced the large-scale upwelling of asthenospheric mantle and triggered the formation of extensive high f O 2 intraplate magmas.
ISSN:2096-0956
2365-7499
DOI:10.1007/s11631-020-00394-7