Plume-Fracture Zone interactions in the NE Atlantic
Typically, the change in lithospheric thickness associated with fracture zones relates directly to the vigor of secondary convection or mantle flow patterns. Therefore, one might expect that mantle flow considerably boosted by the presence of a mantle plume would easily overcome the lithospheric ste...
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ftunivpadovairis:oai:www.research.unipd.it:11577/3455130 2024-04-21T08:01:19+00:00 Plume-Fracture Zone interactions in the NE Atlantic Beloša, Lea Gaina, Carmen Callegaro, Sara Mazzini, Adriano Meyzen, Christine Polteau, Stephane Bizimis, Michael EGU General Assembly 2022 Beloša, Lea Gaina, Carmen Callegaro, Sara Mazzini, Adriano Meyzen, Christine Polteau, Stephane Bizimis, Michael 2022 ELETTRONICO http://hdl.handle.net/11577/3455130 https://doi.org/10.5194/egusphere-egu22-9199 https://meetingorganizer.copernicus.org/EGU22/EGU22-9199.html eng eng ispartofbook:EGU General Assembly 2022 EGU General Assembly 2022 numberofpages:1 alleditors:EGU General Assembly 2022 http://hdl.handle.net/11577/3455130 doi:10.5194/egusphere-egu22-9199 https://meetingorganizer.copernicus.org/EGU22/EGU22-9199.html info:eu-repo/semantics/openAccess info:eu-repo/semantics/conferenceObject 2022 ftunivpadovairis https://doi.org/10.5194/egusphere-egu22-9199 2024-03-28T01:24:23Z Typically, the change in lithospheric thickness associated with fracture zones relates directly to the vigor of secondary convection or mantle flow patterns. Therefore, one might expect that mantle flow considerably boosted by the presence of a mantle plume would easily overcome the lithospheric steps created at fracture zone locations. However, to date, there are no studies to verify this assumption. Numerical models based on an example from the SW Indian Ridge suggest that the axial flow driven by a plume (the Marion plume) is indeed likely to be curtailed by the longoffset fracture zones1. We have investigated the interactions between the Jan Mayen fracture zone and Iceland mantle plume in the NE Atlantic by considering (a) the lithospheric and asthenospheric regional configuration and (b) the geochemistry of rocks produced by submarine volcanism. Several global lithospheric models indicate a thinning of the lithosphere on both sides of the Jan Mayen Fracture transform, despite the difference in age of the two adjacent oceanic basins. However, the tomographic models indicate a gap in the asthenospheric flow at the lithosphereasthenosphere depth under Jan Mayen transform fault, and only a narrow northward channel of this flow is visible under the westernmost part of the fracture zone. Vesteris seamount is an alkaline seamount placed in the central part of the Greenland Basin, located ca. 480 km west from slow-spreading Mohn's ridge and ca. 250 km north from the Jan Mayen Fracture Zone. Vesteris is a solitary volcanic center far away from an active ridge regime with an eruptive age ranging from 650 – 10 ka 2. Here we report new results from geochemical analysis of several samples dredged during the East Greenland Sampling campaign EGS-2012 from the flanks of Vesteris. Whole-rock major and trace elements, together with isotopes and olivine phenocryst mineral data, are used to decipher the source of volcanism at Vesteris Seamount. The Sr-Nd-Pb isotopic signatures indicate that Vesteris volcanism is unrelated to ... Conference Object East Greenland Greenland Iceland Jan Mayen Padua Research Archive (IRIS - Università degli Studi di Padova) |
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Open Polar |
collection |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
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ftunivpadovairis |
language |
English |
description |
Typically, the change in lithospheric thickness associated with fracture zones relates directly to the vigor of secondary convection or mantle flow patterns. Therefore, one might expect that mantle flow considerably boosted by the presence of a mantle plume would easily overcome the lithospheric steps created at fracture zone locations. However, to date, there are no studies to verify this assumption. Numerical models based on an example from the SW Indian Ridge suggest that the axial flow driven by a plume (the Marion plume) is indeed likely to be curtailed by the longoffset fracture zones1. We have investigated the interactions between the Jan Mayen fracture zone and Iceland mantle plume in the NE Atlantic by considering (a) the lithospheric and asthenospheric regional configuration and (b) the geochemistry of rocks produced by submarine volcanism. Several global lithospheric models indicate a thinning of the lithosphere on both sides of the Jan Mayen Fracture transform, despite the difference in age of the two adjacent oceanic basins. However, the tomographic models indicate a gap in the asthenospheric flow at the lithosphereasthenosphere depth under Jan Mayen transform fault, and only a narrow northward channel of this flow is visible under the westernmost part of the fracture zone. Vesteris seamount is an alkaline seamount placed in the central part of the Greenland Basin, located ca. 480 km west from slow-spreading Mohn's ridge and ca. 250 km north from the Jan Mayen Fracture Zone. Vesteris is a solitary volcanic center far away from an active ridge regime with an eruptive age ranging from 650 – 10 ka 2. Here we report new results from geochemical analysis of several samples dredged during the East Greenland Sampling campaign EGS-2012 from the flanks of Vesteris. Whole-rock major and trace elements, together with isotopes and olivine phenocryst mineral data, are used to decipher the source of volcanism at Vesteris Seamount. The Sr-Nd-Pb isotopic signatures indicate that Vesteris volcanism is unrelated to ... |
author2 |
EGU General Assembly 2022 Beloša, Lea Gaina, Carmen Callegaro, Sara Mazzini, Adriano Meyzen, Christine Polteau, Stephane Bizimis, Michael |
format |
Conference Object |
author |
Beloša, Lea Gaina, Carmen Callegaro, Sara Mazzini, Adriano Meyzen, Christine Polteau, Stephane Bizimis, Michael |
spellingShingle |
Beloša, Lea Gaina, Carmen Callegaro, Sara Mazzini, Adriano Meyzen, Christine Polteau, Stephane Bizimis, Michael Plume-Fracture Zone interactions in the NE Atlantic |
author_facet |
Beloša, Lea Gaina, Carmen Callegaro, Sara Mazzini, Adriano Meyzen, Christine Polteau, Stephane Bizimis, Michael |
author_sort |
Beloša, Lea |
title |
Plume-Fracture Zone interactions in the NE Atlantic |
title_short |
Plume-Fracture Zone interactions in the NE Atlantic |
title_full |
Plume-Fracture Zone interactions in the NE Atlantic |
title_fullStr |
Plume-Fracture Zone interactions in the NE Atlantic |
title_full_unstemmed |
Plume-Fracture Zone interactions in the NE Atlantic |
title_sort |
plume-fracture zone interactions in the ne atlantic |
publishDate |
2022 |
url |
http://hdl.handle.net/11577/3455130 https://doi.org/10.5194/egusphere-egu22-9199 https://meetingorganizer.copernicus.org/EGU22/EGU22-9199.html |
genre |
East Greenland Greenland Iceland Jan Mayen |
genre_facet |
East Greenland Greenland Iceland Jan Mayen |
op_relation |
ispartofbook:EGU General Assembly 2022 EGU General Assembly 2022 numberofpages:1 alleditors:EGU General Assembly 2022 http://hdl.handle.net/11577/3455130 doi:10.5194/egusphere-egu22-9199 https://meetingorganizer.copernicus.org/EGU22/EGU22-9199.html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-egu22-9199 |
_version_ |
1796941551063007232 |