Effect of water on the rheology of the lithospheric mantle in young extensional basin systems as shown by xenoliths from the Carpathian-Pannonian region

Liptai, Nóra; Lange, Thomas Pieter; Patkó, Levente; Pintér, Zsanett; Berkesi, Márta; Aradi, László Előd; Szabó, Csaba; Kovàcs, István

doi:10.1016/j.gloplacha.2020.103364

Cited by 8 publications

(2 citation statements)

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“…However, clinopyroxene grains from mantle peridotite xenoliths from the lower part of the NCC lithospheric mantle have water contents as high as 970 ppm (Xia et al., 2013), which indicates that no or only limited partial melting had occurred. This inference is supported by NAMs in the Tihany peridotites from the Carpathian‐Pannonian region, which have similar high water contents to our samples and were found to be in equilibrium with a small amount of incipient partial melts (Kovács et al., 2012; Liptai et al., 2021). On the other hand, water in the enriched lithospheric mantle deduced from our inverse method could be present in melts, hydrous minerals or NAMs.…”

Section: Discussionsupporting

confidence: 84%

Craton Destruction Induced by Drastic Drops in Lithospheric Mantle Viscosity

Wang

Liu

et al. 2022

Earth and Space Science

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The disruption of the mantle roots of cratons is common after cratonization. Craton destruction, which is characterized by severe lithospheric thinning, extensive thrust and extensional deformation, basin filling, and intense thermal activities, is relatively rare and is generally attributed to intensely reduced viscosity contrasts between the lithospheric mantle root and the underlying asthenosphere. However, the extent of the required viscosity contrast remains unclear. The North China craton (NCC) is a typical example of a partially destroyed craton, with its eastern part experiencing destruction in the Early Cretaceous. In this study, we measured the water content of clinopyroxene phenocrysts in Middle Jurassic lithospheric mantle‐derived, weakly alkaline volcanic rocks from the Shanhaiguan area. Our data and those of previous studies show that the lithospheric mantle in the eastern NCC contained substantial amounts of water (650–2,900 ppm) before craton destruction. In addition, the continuous supply of water by the subducted Paleo‐Pacific slab resulted in a more hydrous lithospheric mantle (up to ca. 9,000 ppm) during the craton destruction. The viscosity contrasts between the lithospheric mantle root and the asthenosphere (with an average viscosity of 3.7 × 1018 Pa s) were 2–8 and 0.3–2 before and during the craton destruction, respectively. Our study indicates that a drastic drop in the lithospheric mantle viscosity, which is controlled by the synergic effects of a high water content and elevated temperature, is required to induce craton destruction.

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