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 |
---|---|
Main Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Uppsala universitet, Geofysik
2021
|
Subjects: | |
Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-457022 https://doi.org/10.1038/s41467-021-26878-5 |
id |
ftuppsalauniv:oai:DiVA.org:uu-457022 |
---|---|
record_format |
openpolar |
spelling |
ftuppsalauniv:oai:DiVA.org:uu-457022 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 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-457022 https://doi.org/10.1038/s41467-021-26878-5 eng eng Uppsala universitet, Geofysik Uppsala universitet, Mineralogi, petrologi och tektonik Marine Geodynamics Section, GEOMAR Helmholtz Center for Ocean Research, Kiel, Germany School of Earth Sciences, China University of Geosciences, Wuhan, China; Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland Technical University Bergakademie Freiberg, Freiberg, Germany Springer Nature Nature Communications, 2021, 12, orcid:0000-0002-4056-4850 orcid:0000-0002-3207-2901 orcid:0000-0003-1241-2988 orcid:0000-0002-3945-8065 orcid:0000-0002-7190-3683 orcid:0000-0001-5581-3613 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-457022 doi:10.1038/s41467-021-26878-5 PMID 34772954 ISI:000718060500008 info:eu-repo/semantics/openAccess Geophysics Geofysik Geology Geologi Article in journal info:eu-repo/semantics/article text 2021 ftuppsalauniv https://doi.org/10.1038/s41467-021-26878-5 2024-01-17T23:33:06Z 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/cm3) 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 Uppsala University: Publications (DiVA) Nature Communications 12 1 |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Geophysics Geofysik Geology Geologi |
spellingShingle |
Geophysics Geofysik Geology Geologi 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 |
Geophysics Geofysik Geology Geologi |
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/cm3) 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 |
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 |
Uppsala universitet, Geofysik |
publishDate |
2021 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-457022 https://doi.org/10.1038/s41467-021-26878-5 |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_relation |
Nature Communications, 2021, 12, orcid:0000-0002-4056-4850 orcid:0000-0002-3207-2901 orcid:0000-0003-1241-2988 orcid:0000-0002-3945-8065 orcid:0000-0002-7190-3683 orcid:0000-0001-5581-3613 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-457022 doi:10.1038/s41467-021-26878-5 PMID 34772954 ISI:000718060500008 |
op_rights |
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_ |
1790600107407704064 |