Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region
We present a new model, EUNA‐rho, for the density structure of the continental and oceanic upper mantle based on 3‐D tesseroid gravity modeling. On continent, there is no clear difference in lithospheric mantle (LM) density between the cratonic and Phanerozoic Europe, yet an ~300‐km‐wide zone of a h...
Published in: | Journal of Geophysical Research: Solid Earth |
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ftoslouniv:oai:www.duo.uio.no:10852/77035 2023-05-15T16:29:53+02:00 Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region Shulgin, Alexey A Artemieva, Irina M. 2019-10-08T13:46:39Z http://hdl.handle.net/10852/77035 http://urn.nb.no/URN:NBN:no-80130 https://doi.org/10.1029/2018JB017025 EN eng NFR/223272 http://urn.nb.no/URN:NBN:no-80130 Shulgin, Alexey A Artemieva, Irina M. . Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region. Journal of Geophysical Research (JGR): Solid Earth. 2019 http://hdl.handle.net/10852/77035 1734956 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Geophysical Research (JGR): Solid Earth&rft.volume=&rft.spage=&rft.date=2019 Journal of Geophysical Research (JGR): Solid Earth 124 8 9280 9312 https://doi.org/10.1029/2018JB017025 URN:NBN:no-80130 Fulltext https://www.duo.uio.no/bitstream/handle/10852/77035/1/Shulgin_et_al-2019-Journal_of_Geophysical_Research__Solid_Earth.pdf Attribution-NonCommercial-NoDerivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/ CC-BY-NC-ND 2169-9313 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2019 ftoslouniv https://doi.org/10.1029/2018JB017025 2020-06-21T08:54:40Z We present a new model, EUNA‐rho, for the density structure of the continental and oceanic upper mantle based on 3‐D tesseroid gravity modeling. On continent, there is no clear difference in lithospheric mantle (LM) density between the cratonic and Phanerozoic Europe, yet an ~300‐km‐wide zone of a high‐density LM along the Trans‐European Suture Zone may image a paleosubduction. Kimberlite provinces of the Baltica and Greenland cratons have a low‐density (3.32 g/cm3) mantle where all non‐damondiferous kimberlites tend to a higher‐density (3.34 g/cm3) anomalies. LM density correlates with the depth of sedimentary basins implying that mantle densification plays an important role in basin subsidence. A very dense (3.40–3.45 g/cm3) mantle beneath the superdeep platform basins and the East Barents shelf requires the presence of 10–20% of eclogite, while the West Barents Basin has LM density of 3.35 g/cm3 similar to the Variscan massifs of western Europe. In the North Atlantics, south of the Charlie Gibbs fracture zone (CGFZ) mantle density follows half‐space cooling model with significant deviations at volcanic provinces. North of the CGFZ, the entire North Atlantics is anomalous. Strong low‐density LM anomalies (< −3%) beneath the Azores and north of the CGFZ correlate with geochemical anomalies and indicate the presence of continental fragments and heterogeneous melting sources. Thermal anomalies in the upper mantle averaged down to the transition zone are 100–150 °C at the Azores and can be detected seismically, while a <50 °C anomaly around Iceland is at the limit of seismic resolution. Article in Journal/Newspaper Greenland Iceland North Atlantic Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Greenland Rho ENVELOPE(-63.000,-63.000,-64.300,-64.300) Journal of Geophysical Research: Solid Earth 124 8 9280 9312 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
We present a new model, EUNA‐rho, for the density structure of the continental and oceanic upper mantle based on 3‐D tesseroid gravity modeling. On continent, there is no clear difference in lithospheric mantle (LM) density between the cratonic and Phanerozoic Europe, yet an ~300‐km‐wide zone of a high‐density LM along the Trans‐European Suture Zone may image a paleosubduction. Kimberlite provinces of the Baltica and Greenland cratons have a low‐density (3.32 g/cm3) mantle where all non‐damondiferous kimberlites tend to a higher‐density (3.34 g/cm3) anomalies. LM density correlates with the depth of sedimentary basins implying that mantle densification plays an important role in basin subsidence. A very dense (3.40–3.45 g/cm3) mantle beneath the superdeep platform basins and the East Barents shelf requires the presence of 10–20% of eclogite, while the West Barents Basin has LM density of 3.35 g/cm3 similar to the Variscan massifs of western Europe. In the North Atlantics, south of the Charlie Gibbs fracture zone (CGFZ) mantle density follows half‐space cooling model with significant deviations at volcanic provinces. North of the CGFZ, the entire North Atlantics is anomalous. Strong low‐density LM anomalies (< −3%) beneath the Azores and north of the CGFZ correlate with geochemical anomalies and indicate the presence of continental fragments and heterogeneous melting sources. Thermal anomalies in the upper mantle averaged down to the transition zone are 100–150 °C at the Azores and can be detected seismically, while a <50 °C anomaly around Iceland is at the limit of seismic resolution. |
format |
Article in Journal/Newspaper |
author |
Shulgin, Alexey A Artemieva, Irina M. |
spellingShingle |
Shulgin, Alexey A Artemieva, Irina M. Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region |
author_facet |
Shulgin, Alexey A Artemieva, Irina M. |
author_sort |
Shulgin, Alexey A |
title |
Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region |
title_short |
Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region |
title_full |
Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region |
title_fullStr |
Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region |
title_full_unstemmed |
Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region |
title_sort |
thermochemical heterogeneity and density of continental and oceanic upper mantle in the european‐north atlantic region |
publishDate |
2019 |
url |
http://hdl.handle.net/10852/77035 http://urn.nb.no/URN:NBN:no-80130 https://doi.org/10.1029/2018JB017025 |
long_lat |
ENVELOPE(-63.000,-63.000,-64.300,-64.300) |
geographic |
Greenland Rho |
geographic_facet |
Greenland Rho |
genre |
Greenland Iceland North Atlantic |
genre_facet |
Greenland Iceland North Atlantic |
op_source |
2169-9313 |
op_relation |
NFR/223272 http://urn.nb.no/URN:NBN:no-80130 Shulgin, Alexey A Artemieva, Irina M. . Thermochemical Heterogeneity and Density of Continental and Oceanic Upper Mantle in the European‐North Atlantic Region. Journal of Geophysical Research (JGR): Solid Earth. 2019 http://hdl.handle.net/10852/77035 1734956 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal of Geophysical Research (JGR): Solid Earth&rft.volume=&rft.spage=&rft.date=2019 Journal of Geophysical Research (JGR): Solid Earth 124 8 9280 9312 https://doi.org/10.1029/2018JB017025 URN:NBN:no-80130 Fulltext https://www.duo.uio.no/bitstream/handle/10852/77035/1/Shulgin_et_al-2019-Journal_of_Geophysical_Research__Solid_Earth.pdf |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 International https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1029/2018JB017025 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
124 |
container_issue |
8 |
container_start_page |
9280 |
op_container_end_page |
9312 |
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1766019594141564928 |