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• W1964950990 endingPage "97" @default.
• W1964950990 startingPage "85" @default.
• W1964950990 abstract "It has been suggested that the longevity of cratons (i.e. ancient and stable cores of continents) is related in part to the low water content of their deep mantle roots; this gives them a higher viscosity than the underlying asthenosphere. Consequently, the removal of cratonic roots is expected to be closely connected to the hydration of the lithospheric mantle, but direct evidence for this speculation has been scarce. The eastern part of the North China Craton (NCC) is a clear example of a “destroyed craton”. In this study the H2O content of clinopyroxene phenocrysts was measured in lithospheric mantle-derived high-magnesium basalts of the Feixian area, in the eastern part of the NCC. These lavas erupted in the early Cretaceous (∼120 Ma), which was the peak time of the NCC destruction. Based on these data, it was estimated that the H2O content of the lithospheric mantle source of these basalts consists of more than 1000 ppm by weight. This water content is much higher than in the source of mid-ocean-ridge basalts (50–200 ppm by weight) and also higher than in the Kaapvaal cratonic mantle in South Africa (∼120 ppm by weight); the latter is still stable after >3 billion years. This study argues that a large amount of water was indeed added to the NCC's lithospheric mantle, probably due to the multi-stage subduction of oceanic plates since the early Paleozoic. This high water content significantly reduced the viscosity contrast between the lithospheric mantle and the underlying asthenosphere, and provided a prerequisite for the removal of the cratonic root of the NCC by reducing its strength." @default.
• W1964950990 created "2016-06-24" @default.
• W1964950990 creator A5003241878 @default.
• W1964950990 creator A5024385900 @default.
• W1964950990 creator A5052787818 @default.
• W1964950990 creator A5055592502 @default.
• W1964950990 creator A5057703183 @default.
• W1964950990 creator A5063054537 @default.
• W1964950990 date "2013-01-01" @default.
• W1964950990 modified "2023-10-13" @default.
• W1964950990 title "High water content in Mesozoic primitive basalts of the North China Craton and implications on the destruction of cratonic mantle lithosphere" @default.
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