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Secular change of true polar wander over the past billion years

The rate of movement of Earth’s solid shell relative to its spin axis, or true polar wander, depends on variations in mantle convection and viscosity. We report paleomagnetic and geochronologic data from South China that constrain the rate of rapid true polar wander (>5° per million years) betwee...

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Autores principales: Fu, Hairuo, Zhang, Shihong, Condon, Daniel J., Xian, Hanbiao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9565807/
https://www.ncbi.nlm.nih.gov/pubmed/36240274
http://dx.doi.org/10.1126/sciadv.abo2753
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author Fu, Hairuo
Zhang, Shihong
Condon, Daniel J.
Xian, Hanbiao
author_facet Fu, Hairuo
Zhang, Shihong
Condon, Daniel J.
Xian, Hanbiao
author_sort Fu, Hairuo
collection PubMed
description The rate of movement of Earth’s solid shell relative to its spin axis, or true polar wander, depends on variations in mantle convection and viscosity. We report paleomagnetic and geochronologic data from South China that constrain the rate of rapid true polar wander (>5° per million years) between 832 million years and 821 million years ago. Analysis of the paleomagnetic database demonstrates secular change of true polar wander related to mantle cooling and thermal structure across supercontinent cycles. True polar wander rates are relatively muted with a partially insulated mantle during supercontinent assembly and accelerate as mantle thermal mixing reestablishes with supercontinent breakup. Decreasing true polar wander rate through the Neoproterozoic was succeeded by overall smaller variations in the Phanerozoic. We propose that Neoproterozoic extensive plate tectonic activities enhanced mantle cooling, giving rise to a reduction in mantle convective forcing, an increase in mantle viscosity, and a decrease in true polar wander rates into the Phanerozoic.
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spelling pubmed-95658072022-10-24 Secular change of true polar wander over the past billion years Fu, Hairuo Zhang, Shihong Condon, Daniel J. Xian, Hanbiao Sci Adv Earth, Environmental, Ecological, and Space Sciences The rate of movement of Earth’s solid shell relative to its spin axis, or true polar wander, depends on variations in mantle convection and viscosity. We report paleomagnetic and geochronologic data from South China that constrain the rate of rapid true polar wander (>5° per million years) between 832 million years and 821 million years ago. Analysis of the paleomagnetic database demonstrates secular change of true polar wander related to mantle cooling and thermal structure across supercontinent cycles. True polar wander rates are relatively muted with a partially insulated mantle during supercontinent assembly and accelerate as mantle thermal mixing reestablishes with supercontinent breakup. Decreasing true polar wander rate through the Neoproterozoic was succeeded by overall smaller variations in the Phanerozoic. We propose that Neoproterozoic extensive plate tectonic activities enhanced mantle cooling, giving rise to a reduction in mantle convective forcing, an increase in mantle viscosity, and a decrease in true polar wander rates into the Phanerozoic. American Association for the Advancement of Science 2022-10-14 /pmc/articles/PMC9565807/ /pubmed/36240274 http://dx.doi.org/10.1126/sciadv.abo2753 Text en Copyright © 2022 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Earth, Environmental, Ecological, and Space Sciences
Fu, Hairuo
Zhang, Shihong
Condon, Daniel J.
Xian, Hanbiao
Secular change of true polar wander over the past billion years
title Secular change of true polar wander over the past billion years
title_full Secular change of true polar wander over the past billion years
title_fullStr Secular change of true polar wander over the past billion years
title_full_unstemmed Secular change of true polar wander over the past billion years
title_short Secular change of true polar wander over the past billion years
title_sort secular change of true polar wander over the past billion years
topic Earth, Environmental, Ecological, and Space Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9565807/
https://www.ncbi.nlm.nih.gov/pubmed/36240274
http://dx.doi.org/10.1126/sciadv.abo2753
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