Long-lived Paleoproterozoic eclogitic lower crust
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 eclog...
Published in: | Nature Communications |
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Nature Research
2021
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ftoceanrep:oai:oceanrep.geomar.de:54451 2024-02-11T10:03:47+01:00 Long-lived Paleoproterozoic eclogitic lower crust Buntin, Sebastian Artemieva, Irina M. Malehmir, Alireza Thybo, Hans Malinowski, Michal Högdahl, Karin Janik, Tomasz Buske, Stefan 2021-12-12 text https://oceanrep.geomar.de/id/eprint/54451/ https://oceanrep.geomar.de/id/eprint/54451/1/s41467-021-26878-5.pdf https://oceanrep.geomar.de/id/eprint/54451/2/41467_2021_26878_MOESM1_ESM.pdf https://doi.org/10.1038/s41467-021-26878-5 en eng Nature Research https://oceanrep.geomar.de/id/eprint/54451/1/s41467-021-26878-5.pdf https://oceanrep.geomar.de/id/eprint/54451/2/41467_2021_26878_MOESM1_ESM.pdf Buntin, S., Artemieva, I. M. , Malehmir, A., Thybo, H., Malinowski, M., Högdahl, K., Janik, T. and Buske, S. (2021) Long-lived Paleoproterozoic eclogitic lower crust. Open Access Nature Communications, 12 . Art.Nr. 6553. DOI 10.1038/s41467-021-26878-5 <https://doi.org/10.1038/s41467-021-26878-5>. doi:10.1038/s41467-021-26878-5 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.1038/s41467-021-26878-5 2024-01-15T00:24:17Z 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 OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Nature Communications 12 1 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Buntin, Sebastian Artemieva, Irina M. Malehmir, Alireza Thybo, Hans Malinowski, Michal Högdahl, Karin Janik, Tomasz Buske, Stefan |
spellingShingle |
Buntin, Sebastian Artemieva, Irina M. Malehmir, Alireza Thybo, Hans Malinowski, Michal Högdahl, Karin Janik, Tomasz Buske, Stefan Long-lived Paleoproterozoic eclogitic lower crust |
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 |
Nature Research |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/54451/ https://oceanrep.geomar.de/id/eprint/54451/1/s41467-021-26878-5.pdf https://oceanrep.geomar.de/id/eprint/54451/2/41467_2021_26878_MOESM1_ESM.pdf https://doi.org/10.1038/s41467-021-26878-5 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_relation |
https://oceanrep.geomar.de/id/eprint/54451/1/s41467-021-26878-5.pdf https://oceanrep.geomar.de/id/eprint/54451/2/41467_2021_26878_MOESM1_ESM.pdf Buntin, S., Artemieva, I. M. , Malehmir, A., Thybo, H., Malinowski, M., Högdahl, K., Janik, T. and Buske, S. (2021) Long-lived Paleoproterozoic eclogitic lower crust. Open Access Nature Communications, 12 . Art.Nr. 6553. DOI 10.1038/s41467-021-26878-5 <https://doi.org/10.1038/s41467-021-26878-5>. doi:10.1038/s41467-021-26878-5 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s41467-021-26878-5 |
container_title |
Nature Communications |
container_volume |
12 |
container_issue |
1 |
_version_ |
1790600107215814656 |