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Zircon evidence for incorporation of terrigenous sediments into the magma source of continental basalts

Crustal components may be incorporated into continental basalts by either shallow contamination or deep mixing. While the former proceeds at crustal depths with common preservation of refractory minerals, the latter occurs at mantle depths with rare survival of relict minerals. Discrimination betwee...

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Autores principales: Xu, Zheng, Zheng, Yong-Fei, Zhao, Zi-Fu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5760614/
https://www.ncbi.nlm.nih.gov/pubmed/29317729
http://dx.doi.org/10.1038/s41598-017-18549-7
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author Xu, Zheng
Zheng, Yong-Fei
Zhao, Zi-Fu
author_facet Xu, Zheng
Zheng, Yong-Fei
Zhao, Zi-Fu
author_sort Xu, Zheng
collection PubMed
description Crustal components may be incorporated into continental basalts by either shallow contamination or deep mixing. While the former proceeds at crustal depths with common preservation of refractory minerals, the latter occurs at mantle depths with rare survival of relict minerals. Discrimination between the two mechanisms has great bearing to subcontinental mantle geochemistry. Here we report the occurrence of relict zircons in Cenozoic continental basalts from eastern China. A combined study of zircon U-Pb ages and geochemistry indicates that detrital zircons were carried by terrigenous sediments into a subcontinental subduction zone, where the zircon were transferred by fluids into the magma sources of continental basalts. The basalts were sampled from three petrotectonic units with distinct differences in their magmatic and metamorphic ages, making the crustal contamination discernible. The terrigenous sediments were carried by the subducting oceanic crust into the asthenospheric mantle, producing both soluble and insoluble materials at the slab-mantle interface. These materials were served as metasomatic agents to react with the overlying mantle wedge peridotite, generating a kind of ultramafic metasomatites that contain the relict zircons. Therefore, the occurrence of relict zircons in continental basalts indicates that this refractory mineral can survive extreme temperature-pressure conditions in the asthenospheric mantle.
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spelling pubmed-57606142018-01-17 Zircon evidence for incorporation of terrigenous sediments into the magma source of continental basalts Xu, Zheng Zheng, Yong-Fei Zhao, Zi-Fu Sci Rep Article Crustal components may be incorporated into continental basalts by either shallow contamination or deep mixing. While the former proceeds at crustal depths with common preservation of refractory minerals, the latter occurs at mantle depths with rare survival of relict minerals. Discrimination between the two mechanisms has great bearing to subcontinental mantle geochemistry. Here we report the occurrence of relict zircons in Cenozoic continental basalts from eastern China. A combined study of zircon U-Pb ages and geochemistry indicates that detrital zircons were carried by terrigenous sediments into a subcontinental subduction zone, where the zircon were transferred by fluids into the magma sources of continental basalts. The basalts were sampled from three petrotectonic units with distinct differences in their magmatic and metamorphic ages, making the crustal contamination discernible. The terrigenous sediments were carried by the subducting oceanic crust into the asthenospheric mantle, producing both soluble and insoluble materials at the slab-mantle interface. These materials were served as metasomatic agents to react with the overlying mantle wedge peridotite, generating a kind of ultramafic metasomatites that contain the relict zircons. Therefore, the occurrence of relict zircons in continental basalts indicates that this refractory mineral can survive extreme temperature-pressure conditions in the asthenospheric mantle. Nature Publishing Group UK 2018-01-09 /pmc/articles/PMC5760614/ /pubmed/29317729 http://dx.doi.org/10.1038/s41598-017-18549-7 Text en © The Author(s) 2018 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
Xu, Zheng
Zheng, Yong-Fei
Zhao, Zi-Fu
Zircon evidence for incorporation of terrigenous sediments into the magma source of continental basalts
title Zircon evidence for incorporation of terrigenous sediments into the magma source of continental basalts
title_full Zircon evidence for incorporation of terrigenous sediments into the magma source of continental basalts
title_fullStr Zircon evidence for incorporation of terrigenous sediments into the magma source of continental basalts
title_full_unstemmed Zircon evidence for incorporation of terrigenous sediments into the magma source of continental basalts
title_short Zircon evidence for incorporation of terrigenous sediments into the magma source of continental basalts
title_sort zircon evidence for incorporation of terrigenous sediments into the magma source of continental basalts
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5760614/
https://www.ncbi.nlm.nih.gov/pubmed/29317729
http://dx.doi.org/10.1038/s41598-017-18549-7
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