Buffering of mantle conditions through water cycling and thermal feedbacks maintains magmatism over geologic time
| dc.citation.articleNumber | 293 | |
| dc.citation.journalTitle | Communications Earth & Environment | |
| dc.citation.volumeNumber | 3 | |
| dc.contributor.author | Seales, Johnny | |
| dc.contributor.author | Lenardic, Adrian | |
| dc.contributor.author | Richards, Mark | |
| dc.date.accessioned | 2022-12-13T19:11:37Z | |
| dc.date.available | 2022-12-13T19:11:37Z | |
| dc.date.issued | 2022 | |
| dc.description.abstract | The Earth has remained magmatically and volcanically active over its full geologic history despite continued planetary cooling and a lack of thermal equilibrium in the mantle. Here we investigate this conundrum using data-constrained numerical models of deep-water cycling and thermal history. We find that the homologous temperature - the ratio of upper mantle to melting temperatures - initially declined but has been buffered at a nearly constant value since 2.5-2.0 billion years ago. Melt buffering is a result of the dependence of melting temperature and mantle viscosity on both mantle temperature and water content. We show that thermal and water cycling feedbacks lead to a self-regulated mantle evolution, characterised by a near-constant mantle viscosity. This occurs even though the mantle remains far from thermal equilibrium. The added feedback from water-dependent melting allows magmatism to be co-buffered over geological time. Thus, we propose that coupled thermal and water cycling feedbacks have maintained melting on Earth and associated volcanic/magmatic activity. | |
| dc.identifier.citation | Seales, Johnny, Lenardic, Adrian and Richards, Mark. "Buffering of mantle conditions through water cycling and thermal feedbacks maintains magmatism over geologic time." <i>Communications Earth & Environment,</i> 3, (2022) Springer Nature: https://doi.org/10.1038/s43247-022-00617-0. | |
| dc.identifier.digital | s43247-022-00617-0 | |
| dc.identifier.doi | https://doi.org/10.1038/s43247-022-00617-0 | |
| dc.identifier.uri | https://hdl.handle.net/1911/114127 | |
| dc.language.iso | eng | |
| dc.publisher | Springer Nature | |
| dc.rights | 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. | |
| dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
| dc.title | Buffering of mantle conditions through water cycling and thermal feedbacks maintains magmatism over geologic time | |
| dc.type | Journal article | |
| dc.type.dcmi | Text | |
| dc.type.publication | publisher version |
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