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- W2046404313 abstract "Extensive Late Mesozoic igneous rocks in SE China have been widely considered to be generated under the paleo-Pacific tectonic regime, the plate subduction model, however, remains controversial. This study focuses on the Cretaceous volcanic rocks in northwestern Zhejiang Province. Zircon U–Pb age determination indicates that Cretaceous volcanism in northwestern Zhejiang took place at three episodes of 140–130, 130–127 and 123–118 Ma, in good agreement with the coeval lower volcanic series in southeastern Zhejiang, but lacking the episode at 110–88 Ma corresponding to the upper volcanic series. The Cretaceous volcanic rocks in Zhejiang therefore show an oceanward younging trend. In situ zircon Hf isotope analyses of three episodes of volcanics yield εHf(t) values of − 11.2 to − 8.7, –4.8 to − 2.4 and − 4.4 to + 2.2, respectively. The entire sequences display typical isotopic features of magma mixing, implying progressive involvement of juvenile component. Based on systematical researches on the Cretaceous volcanic rocks and a series of granitoid plutons in Zhejiang, it is also identified that the juvenile component involvement gradually occurred from the inland to the coast under an enhanced lithospheric extensional tectonic setting. All the observations in this study indicate the northwestward paleo-Pacific plate subduction with episodic slab rollback which triggered the arc system to retreat towards the Pacific Ocean, rather than the southwestward subduction related to the ridge subduction along the Lower Yangtze River belt." @default.
- W2046404313 created "2016-06-24" @default.
- W2046404313 creator A5005598847 @default.
- W2046404313 creator A5047095758 @default.
- W2046404313 creator A5072250836 @default.
- W2046404313 date "2014-02-01" @default.
- W2046404313 modified "2023-10-11" @default.
- W2046404313 title "Cretaceous Pacific plate movement beneath SE China: Evidence from episodic volcanism and related intrusions" @default.
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- W2046404313 doi "https://doi.org/10.1016/j.tecto.2013.12.007" @default.
- W2046404313 hasPublicationYear "2014" @default.
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