Long-lived Paleoproterozoic eclogitic lower crust
Abstract The nature of the lower crust and the crust-mantle transition is fundamental to Earth sciences. Transformation of lower crustal rocks into eclogite facies is usually expected to result in lower crustal delamination. Here we provide compelling evidence for long-lasting presence of lower crus...
Published in: | Nature Communications |
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2021
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Online Access: | http://dx.doi.org/10.1038/s41467-021-26878-5 https://www.nature.com/articles/s41467-021-26878-5.pdf https://www.nature.com/articles/s41467-021-26878-5 |
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crspringernat:10.1038/s41467-021-26878-5 2023-05-15T16:12:58+02:00 Long-lived Paleoproterozoic eclogitic lower crust Buntin, Sebastian Artemieva, Irina M. Malehmir, Alireza Thybo, Hans Malinowski, Michal Högdahl, Karin Janik, Tomasz Buske, Stefan Vetenskapsrådet Natur og Univers, Det Frie Forskningsråd 2021 http://dx.doi.org/10.1038/s41467-021-26878-5 https://www.nature.com/articles/s41467-021-26878-5.pdf https://www.nature.com/articles/s41467-021-26878-5 en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Nature Communications volume 12, issue 1 ISSN 2041-1723 General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry journal-article 2021 crspringernat https://doi.org/10.1038/s41467-021-26878-5 2022-01-04T08:21:27Z Abstract The nature of the lower crust and the crust-mantle transition is fundamental to Earth sciences. Transformation of lower crustal rocks into eclogite facies is usually expected to result in lower crustal delamination. Here we provide compelling evidence for long-lasting presence of lower crustal eclogite below the seismic Moho. Our new wide-angle seismic data from the Paleoproterozoic Fennoscandian Shield identify a 6–8 km thick body with extremely high velocity (Vp ~ 8.5–8.6 km/s) and high density (>3.4 g/cm 3 ) immediately beneath equally thinned high-velocity (Vp ~ 7.3–7.4 km/s) lowermost crust, which extends over >350 km distance. We relate this observed structure to partial (50–70%) transformation of part of the mafic lowermost crustal layer into eclogite facies during Paleoproterozoic orogeny without later delamination. Our findings challenge conventional models for the role of lower crustal eclogitization and delamination in lithosphere evolution and for the long-term stability of cratonic crust. Article in Journal/Newspaper Fennoscandian Springer Nature (via Crossref) Nature Communications 12 1 |
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Open Polar |
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Springer Nature (via Crossref) |
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crspringernat |
language |
English |
topic |
General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry |
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General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry Buntin, Sebastian Artemieva, Irina M. Malehmir, Alireza Thybo, Hans Malinowski, Michal Högdahl, Karin Janik, Tomasz Buske, Stefan Long-lived Paleoproterozoic eclogitic lower crust |
topic_facet |
General Physics and Astronomy General Biochemistry, Genetics and Molecular Biology General Chemistry |
description |
Abstract The nature of the lower crust and the crust-mantle transition is fundamental to Earth sciences. Transformation of lower crustal rocks into eclogite facies is usually expected to result in lower crustal delamination. Here we provide compelling evidence for long-lasting presence of lower crustal eclogite below the seismic Moho. Our new wide-angle seismic data from the Paleoproterozoic Fennoscandian Shield identify a 6–8 km thick body with extremely high velocity (Vp ~ 8.5–8.6 km/s) and high density (>3.4 g/cm 3 ) immediately beneath equally thinned high-velocity (Vp ~ 7.3–7.4 km/s) lowermost crust, which extends over >350 km distance. We relate this observed structure to partial (50–70%) transformation of part of the mafic lowermost crustal layer into eclogite facies during Paleoproterozoic orogeny without later delamination. Our findings challenge conventional models for the role of lower crustal eclogitization and delamination in lithosphere evolution and for the long-term stability of cratonic crust. |
author2 |
Vetenskapsrådet Natur og Univers, Det Frie Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Buntin, Sebastian Artemieva, Irina M. Malehmir, Alireza Thybo, Hans Malinowski, Michal Högdahl, Karin Janik, Tomasz Buske, Stefan |
author_facet |
Buntin, Sebastian Artemieva, Irina M. Malehmir, Alireza Thybo, Hans Malinowski, Michal Högdahl, Karin Janik, Tomasz Buske, Stefan |
author_sort |
Buntin, Sebastian |
title |
Long-lived Paleoproterozoic eclogitic lower crust |
title_short |
Long-lived Paleoproterozoic eclogitic lower crust |
title_full |
Long-lived Paleoproterozoic eclogitic lower crust |
title_fullStr |
Long-lived Paleoproterozoic eclogitic lower crust |
title_full_unstemmed |
Long-lived Paleoproterozoic eclogitic lower crust |
title_sort |
long-lived paleoproterozoic eclogitic lower crust |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1038/s41467-021-26878-5 https://www.nature.com/articles/s41467-021-26878-5.pdf https://www.nature.com/articles/s41467-021-26878-5 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
Nature Communications volume 12, issue 1 ISSN 2041-1723 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41467-021-26878-5 |
container_title |
Nature Communications |
container_volume |
12 |
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1 |
_version_ |
1765998580352417792 |