Mantle exhumation at magma-poor rifted margins controlled by frictional shear zones
The transition zone from continental crust to the mature mid-ocean ridge spreading center of the Iberia-Newfoundland magma-poor rifted margins is mostly composed of exhumed mantle characterized by highs and domes with varying elevation, spacing and shape. The mechanism controlling strain localizatio...
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ftpubmed:oai:pubmedcentral.nih.gov:8960832 2023-05-15T14:02:09+02:00 Mantle exhumation at magma-poor rifted margins controlled by frictional shear zones Theunissen, Thomas Huismans, Ritske S. 2022-03-28 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8960832/ http://www.ncbi.nlm.nih.gov/pubmed/35347122 https://doi.org/10.1038/s41467-022-29058-1 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8960832/ http://www.ncbi.nlm.nih.gov/pubmed/35347122 http://dx.doi.org/10.1038/s41467-022-29058-1 © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/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/ (https://creativecommons.org/licenses/by/4.0/) . CC-BY Nat Commun Article Text 2022 ftpubmed https://doi.org/10.1038/s41467-022-29058-1 2022-04-24T00:28:31Z The transition zone from continental crust to the mature mid-ocean ridge spreading center of the Iberia-Newfoundland magma-poor rifted margins is mostly composed of exhumed mantle characterized by highs and domes with varying elevation, spacing and shape. The mechanism controlling strain localization and fault migration explaining the geometry of these peridotite ridges is poorly understood. Here we show using forward geodynamic models that multiple out-of-sequence detachments with recurring dip reversal form during magma-poor rifting and mantle exhumation as a consequence of the strength competition between weak frictional-plastic shear zones and the thermally weakened necking domain beneath the exhuming footwall explaining geometry of these peridotite ridges. Model behaviour also shows that fault types and detachment styles vary with spreading rate and fault strength and confirm that these results can be compared to other magma poor passive margins such as along Antarctica-Australia and to ultra-slow mid-ocean spreading systems as the South-West Indian Ridge. Text Antarc* Antarctica Newfoundland PubMed Central (PMC) Indian Nature Communications 13 1 |
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Article Theunissen, Thomas Huismans, Ritske S. Mantle exhumation at magma-poor rifted margins controlled by frictional shear zones |
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description |
The transition zone from continental crust to the mature mid-ocean ridge spreading center of the Iberia-Newfoundland magma-poor rifted margins is mostly composed of exhumed mantle characterized by highs and domes with varying elevation, spacing and shape. The mechanism controlling strain localization and fault migration explaining the geometry of these peridotite ridges is poorly understood. Here we show using forward geodynamic models that multiple out-of-sequence detachments with recurring dip reversal form during magma-poor rifting and mantle exhumation as a consequence of the strength competition between weak frictional-plastic shear zones and the thermally weakened necking domain beneath the exhuming footwall explaining geometry of these peridotite ridges. Model behaviour also shows that fault types and detachment styles vary with spreading rate and fault strength and confirm that these results can be compared to other magma poor passive margins such as along Antarctica-Australia and to ultra-slow mid-ocean spreading systems as the South-West Indian Ridge. |
format |
Text |
author |
Theunissen, Thomas Huismans, Ritske S. |
author_facet |
Theunissen, Thomas Huismans, Ritske S. |
author_sort |
Theunissen, Thomas |
title |
Mantle exhumation at magma-poor rifted margins controlled by frictional shear zones |
title_short |
Mantle exhumation at magma-poor rifted margins controlled by frictional shear zones |
title_full |
Mantle exhumation at magma-poor rifted margins controlled by frictional shear zones |
title_fullStr |
Mantle exhumation at magma-poor rifted margins controlled by frictional shear zones |
title_full_unstemmed |
Mantle exhumation at magma-poor rifted margins controlled by frictional shear zones |
title_sort |
mantle exhumation at magma-poor rifted margins controlled by frictional shear zones |
publisher |
Nature Publishing Group UK |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8960832/ http://www.ncbi.nlm.nih.gov/pubmed/35347122 https://doi.org/10.1038/s41467-022-29058-1 |
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Indian |
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Indian |
genre |
Antarc* Antarctica Newfoundland |
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Antarc* Antarctica Newfoundland |
op_source |
Nat Commun |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8960832/ http://www.ncbi.nlm.nih.gov/pubmed/35347122 http://dx.doi.org/10.1038/s41467-022-29058-1 |
op_rights |
© The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/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/ (https://creativecommons.org/licenses/by/4.0/) . |
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CC-BY |
op_doi |
https://doi.org/10.1038/s41467-022-29058-1 |
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Nature Communications |
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13 |
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