The evolution of basal mantle structure in response to supercontinent aggregation and dispersal

Abstract Seismic studies have revealed two Large Low-Shear Velocity Provinces (LLSVPs) in the lowermost mantle. Whether these structures remain stable over time or evolve through supercontinent cycles is debated. Here we analyze a recently published mantle flow model constrained by a synthetic plate...

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Autores principales:	Xianzhi Cao, Nicolas Flament, Ömer F. Bodur, R. Dietmar Müller
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e796af7513384355952a8e30bc419339
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spelling	oai:doaj.org-article:e796af7513384355952a8e30bc4193392021-11-28T12:21:05ZThe evolution of basal mantle structure in response to supercontinent aggregation and dispersal10.1038/s41598-021-02359-z2045-2322https://doaj.org/article/e796af7513384355952a8e30bc4193392021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02359-zhttps://doaj.org/toc/2045-2322Abstract Seismic studies have revealed two Large Low-Shear Velocity Provinces (LLSVPs) in the lowermost mantle. Whether these structures remain stable over time or evolve through supercontinent cycles is debated. Here we analyze a recently published mantle flow model constrained by a synthetic plate motion model extending back to one billion years ago, to investigate how the mantle evolves in response to changing plate configurations. Our model predicts that sinking slabs segment the basal thermochemical structure below an assembling supercontinent, and that this structure eventually becomes unified due to slab push from circum-supercontinental subduction. In contrast, the basal thermochemical structure below the superocean is generally coherent due to the persistence of a superocean in our imposed plate reconstruction. The two antipodal basal thermochemical structures exchange material several times when part of one of the structures is carved out and merged with the other one, similarly to “exotic” tectonic terranes. Plumes mostly rise from thick basal thermochemical structures and in some instances migrate from the edges towards the interior of basal thermochemical structures due to slab push. Our results suggest that the topography of basal structures and distribution of plumes change over time due to the changing subduction network over supercontinent cycles.Xianzhi CaoNicolas FlamentÖmer F. BodurR. Dietmar MüllerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xianzhi Cao Nicolas Flament Ömer F. Bodur R. Dietmar Müller The evolution of basal mantle structure in response to supercontinent aggregation and dispersal
description	Abstract Seismic studies have revealed two Large Low-Shear Velocity Provinces (LLSVPs) in the lowermost mantle. Whether these structures remain stable over time or evolve through supercontinent cycles is debated. Here we analyze a recently published mantle flow model constrained by a synthetic plate motion model extending back to one billion years ago, to investigate how the mantle evolves in response to changing plate configurations. Our model predicts that sinking slabs segment the basal thermochemical structure below an assembling supercontinent, and that this structure eventually becomes unified due to slab push from circum-supercontinental subduction. In contrast, the basal thermochemical structure below the superocean is generally coherent due to the persistence of a superocean in our imposed plate reconstruction. The two antipodal basal thermochemical structures exchange material several times when part of one of the structures is carved out and merged with the other one, similarly to “exotic” tectonic terranes. Plumes mostly rise from thick basal thermochemical structures and in some instances migrate from the edges towards the interior of basal thermochemical structures due to slab push. Our results suggest that the topography of basal structures and distribution of plumes change over time due to the changing subduction network over supercontinent cycles.
format	article
author	Xianzhi Cao Nicolas Flament Ömer F. Bodur R. Dietmar Müller
author_facet	Xianzhi Cao Nicolas Flament Ömer F. Bodur R. Dietmar Müller
author_sort	Xianzhi Cao
title	The evolution of basal mantle structure in response to supercontinent aggregation and dispersal
title_short	The evolution of basal mantle structure in response to supercontinent aggregation and dispersal
title_full	The evolution of basal mantle structure in response to supercontinent aggregation and dispersal
title_fullStr	The evolution of basal mantle structure in response to supercontinent aggregation and dispersal
title_full_unstemmed	The evolution of basal mantle structure in response to supercontinent aggregation and dispersal
title_sort	evolution of basal mantle structure in response to supercontinent aggregation and dispersal
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e796af7513384355952a8e30bc419339
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The evolution of basal mantle structure in response to supercontinent aggregation and dispersal

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