The East Greenland Caledonides—teleseismic signature, gravity and isostasy
The large-scale geological evolution of the North Atlantic Realm during the past 450 Myr is largely understood, but crucial elements remain uncertain. These involve the Caledonian orogeny, the formation of the North Atlantic and accompanying igneous activity, and the present-day high topography surr...
Published in: | Geophysical Journal International |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/35e4667e-c62d-455e-9f23-97685c970dc2 2023-05-15T16:03:34+02:00 The East Greenland Caledonides—teleseismic signature, gravity and isostasy Schiffer, Christian Jacobsen, Bo Holm Balling, Niels Ebbing, Jörg Nielsen, Søren Bom 2015-11 https://pure.au.dk/portal/da/publications/the-east-greenland-caledonidesteleseismic-signature-gravity-and-isostasy(35e4667e-c62d-455e-9f23-97685c970dc2).html https://doi.org/10.1093/gji/ggv373 eng eng info:eu-repo/semantics/restrictedAccess Schiffer , C , Jacobsen , B H , Balling , N , Ebbing , J & Nielsen , S B 2015 , ' The East Greenland Caledonides—teleseismic signature, gravity and isostasy ' , Geophysical Journal International , vol. 203 , no. 2 , pp. 1400-1418 . https://doi.org/10.1093/gji/ggv373 Body waves subduction zone processes Dynamics of lithosphere and mantle Crustal Structure Atlantic Ocean East Greenland article 2015 ftuniaarhuspubl https://doi.org/10.1093/gji/ggv373 2021-08-04T22:45:19Z The large-scale geological evolution of the North Atlantic Realm during the past 450 Myr is largely understood, but crucial elements remain uncertain. These involve the Caledonian orogeny, the formation of the North Atlantic and accompanying igneous activity, and the present-day high topography surrounding the North Atlantic. Teleseismic receiver function interpretation in the Central Fjord Region of East Greenland recently suggested the presence of a fossil Caledonian subduction complex, including a slab of eclogitised mafic crust and an overlying wedge of serpentinised mantle peridotite. Here we further investigate this topic using inverse receiver functions modelling. The obtained velocity models are tested with regard to their consistency with the regional gravity field and topography. We find that the obtained receiver function model is generally consistent with gravity and isostasy. The western part of the section, with topography of >1000 m, is clearly supported by the 40 km thick crust. The eastern part requires additional buoyancy as provided by the hydrated mantle wedge. The geometry, velocities and densities are consistent with interpretation of the lithospheric structure as a fossil subduction zone complex. The spatial relations with Caledonian structures suggest a Caledonian origin. The results indicate that topography is isostatically compensated by density variations within the lithosphere, and that significant dynamic topography is not required at the present day. Article in Journal/Newspaper East Greenland Greenland North Atlantic Aarhus University: Research Greenland Geophysical Journal International 203 2 1400 1418 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Body waves subduction zone processes Dynamics of lithosphere and mantle Crustal Structure Atlantic Ocean East Greenland |
spellingShingle |
Body waves subduction zone processes Dynamics of lithosphere and mantle Crustal Structure Atlantic Ocean East Greenland Schiffer, Christian Jacobsen, Bo Holm Balling, Niels Ebbing, Jörg Nielsen, Søren Bom The East Greenland Caledonides—teleseismic signature, gravity and isostasy |
topic_facet |
Body waves subduction zone processes Dynamics of lithosphere and mantle Crustal Structure Atlantic Ocean East Greenland |
description |
The large-scale geological evolution of the North Atlantic Realm during the past 450 Myr is largely understood, but crucial elements remain uncertain. These involve the Caledonian orogeny, the formation of the North Atlantic and accompanying igneous activity, and the present-day high topography surrounding the North Atlantic. Teleseismic receiver function interpretation in the Central Fjord Region of East Greenland recently suggested the presence of a fossil Caledonian subduction complex, including a slab of eclogitised mafic crust and an overlying wedge of serpentinised mantle peridotite. Here we further investigate this topic using inverse receiver functions modelling. The obtained velocity models are tested with regard to their consistency with the regional gravity field and topography. We find that the obtained receiver function model is generally consistent with gravity and isostasy. The western part of the section, with topography of >1000 m, is clearly supported by the 40 km thick crust. The eastern part requires additional buoyancy as provided by the hydrated mantle wedge. The geometry, velocities and densities are consistent with interpretation of the lithospheric structure as a fossil subduction zone complex. The spatial relations with Caledonian structures suggest a Caledonian origin. The results indicate that topography is isostatically compensated by density variations within the lithosphere, and that significant dynamic topography is not required at the present day. |
format |
Article in Journal/Newspaper |
author |
Schiffer, Christian Jacobsen, Bo Holm Balling, Niels Ebbing, Jörg Nielsen, Søren Bom |
author_facet |
Schiffer, Christian Jacobsen, Bo Holm Balling, Niels Ebbing, Jörg Nielsen, Søren Bom |
author_sort |
Schiffer, Christian |
title |
The East Greenland Caledonides—teleseismic signature, gravity and isostasy |
title_short |
The East Greenland Caledonides—teleseismic signature, gravity and isostasy |
title_full |
The East Greenland Caledonides—teleseismic signature, gravity and isostasy |
title_fullStr |
The East Greenland Caledonides—teleseismic signature, gravity and isostasy |
title_full_unstemmed |
The East Greenland Caledonides—teleseismic signature, gravity and isostasy |
title_sort |
east greenland caledonides—teleseismic signature, gravity and isostasy |
publishDate |
2015 |
url |
https://pure.au.dk/portal/da/publications/the-east-greenland-caledonidesteleseismic-signature-gravity-and-isostasy(35e4667e-c62d-455e-9f23-97685c970dc2).html https://doi.org/10.1093/gji/ggv373 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland North Atlantic |
genre_facet |
East Greenland Greenland North Atlantic |
op_source |
Schiffer , C , Jacobsen , B H , Balling , N , Ebbing , J & Nielsen , S B 2015 , ' The East Greenland Caledonides—teleseismic signature, gravity and isostasy ' , Geophysical Journal International , vol. 203 , no. 2 , pp. 1400-1418 . https://doi.org/10.1093/gji/ggv373 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1093/gji/ggv373 |
container_title |
Geophysical Journal International |
container_volume |
203 |
container_issue |
2 |
container_start_page |
1400 |
op_container_end_page |
1418 |
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1766399250571198464 |