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Melting of recycled ancient crust responsible for the Gutenberg discontinuity

A discontinuity in the seismic velocity associated with the lithosphere-asthenosphere interface, known as the Gutenberg discontinuity, is enigmatic in its origin. While partial mantle melts are frequently suggested to explain this discontinuity, it is not well known which factors critically regulate...

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Autores principales: Liu, Jia, Hirano, Naoto, Machida, Shiki, Xia, Qunke, Tao, Chunhui, Liao, Shili, Liang, Jin, Li, Wei, Yang, Weifang, Zhang, Guoying, Ding, Teng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6954225/
https://www.ncbi.nlm.nih.gov/pubmed/31924776
http://dx.doi.org/10.1038/s41467-019-13958-w
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author Liu, Jia
Hirano, Naoto
Machida, Shiki
Xia, Qunke
Tao, Chunhui
Liao, Shili
Liang, Jin
Li, Wei
Yang, Weifang
Zhang, Guoying
Ding, Teng
author_facet Liu, Jia
Hirano, Naoto
Machida, Shiki
Xia, Qunke
Tao, Chunhui
Liao, Shili
Liang, Jin
Li, Wei
Yang, Weifang
Zhang, Guoying
Ding, Teng
author_sort Liu, Jia
collection PubMed
description A discontinuity in the seismic velocity associated with the lithosphere-asthenosphere interface, known as the Gutenberg discontinuity, is enigmatic in its origin. While partial mantle melts are frequently suggested to explain this discontinuity, it is not well known which factors critically regulate the melt production. Here, we report geochemical evidence showing that the melt fractions in the lithosphere-asthenosphere boundary were enhanced not only by accumulation of compacted carbonated melts related to recycled ancient marine sediments, but also by partial melting of a pyroxene-rich mantle domain related to the recycled oceanic eclogite/pyroxenites. This conclusion is derived from the first set of Mg isotope data for a suite of young petit-spot basalts erupted on the northwest Pacific plate, where a clearly defined Gutenberg discontinuity exists. Our results reveal a specific linkage between the Gutenberg discontinuity beneath the normal oceanic regions and the recycling of ancient subducted crust and carbonate through the deep Earth.
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spelling pubmed-69542252020-01-13 Melting of recycled ancient crust responsible for the Gutenberg discontinuity Liu, Jia Hirano, Naoto Machida, Shiki Xia, Qunke Tao, Chunhui Liao, Shili Liang, Jin Li, Wei Yang, Weifang Zhang, Guoying Ding, Teng Nat Commun Article A discontinuity in the seismic velocity associated with the lithosphere-asthenosphere interface, known as the Gutenberg discontinuity, is enigmatic in its origin. While partial mantle melts are frequently suggested to explain this discontinuity, it is not well known which factors critically regulate the melt production. Here, we report geochemical evidence showing that the melt fractions in the lithosphere-asthenosphere boundary were enhanced not only by accumulation of compacted carbonated melts related to recycled ancient marine sediments, but also by partial melting of a pyroxene-rich mantle domain related to the recycled oceanic eclogite/pyroxenites. This conclusion is derived from the first set of Mg isotope data for a suite of young petit-spot basalts erupted on the northwest Pacific plate, where a clearly defined Gutenberg discontinuity exists. Our results reveal a specific linkage between the Gutenberg discontinuity beneath the normal oceanic regions and the recycling of ancient subducted crust and carbonate through the deep Earth. Nature Publishing Group UK 2020-01-10 /pmc/articles/PMC6954225/ /pubmed/31924776 http://dx.doi.org/10.1038/s41467-019-13958-w Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Liu, Jia
Hirano, Naoto
Machida, Shiki
Xia, Qunke
Tao, Chunhui
Liao, Shili
Liang, Jin
Li, Wei
Yang, Weifang
Zhang, Guoying
Ding, Teng
Melting of recycled ancient crust responsible for the Gutenberg discontinuity
title Melting of recycled ancient crust responsible for the Gutenberg discontinuity
title_full Melting of recycled ancient crust responsible for the Gutenberg discontinuity
title_fullStr Melting of recycled ancient crust responsible for the Gutenberg discontinuity
title_full_unstemmed Melting of recycled ancient crust responsible for the Gutenberg discontinuity
title_short Melting of recycled ancient crust responsible for the Gutenberg discontinuity
title_sort melting of recycled ancient crust responsible for the gutenberg discontinuity
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6954225/
https://www.ncbi.nlm.nih.gov/pubmed/31924776
http://dx.doi.org/10.1038/s41467-019-13958-w
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