Two deep-mantle sources for Paleocene doming and volcanism in the North Atlantic
The North Atlantic Igneous Province (NAIP) erupted in two major pulses that coincide with the continental breakup and the opening of the North Atlantic Ocean over a period from 62 to 54 Ma. The unknown mantle structure under the North Atlantic during the Paleocene represents a major missing link in...
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ftpubmed:oai:pubmedcentral.nih.gov:6612917 2023-05-15T16:29:17+02:00 Two deep-mantle sources for Paleocene doming and volcanism in the North Atlantic Glišović, Petar Forte, Alessandro M. 2019-07-02 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6612917/ http://www.ncbi.nlm.nih.gov/pubmed/31196961 https://doi.org/10.1073/pnas.1816188116 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6612917/ http://www.ncbi.nlm.nih.gov/pubmed/31196961 http://dx.doi.org/10.1073/pnas.1816188116 https://www.pnas.org/site/aboutpnas/licenses.xhtmlPublished under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . Physical Sciences Text 2019 ftpubmed https://doi.org/10.1073/pnas.1816188116 2019-12-15T01:13:53Z The North Atlantic Igneous Province (NAIP) erupted in two major pulses that coincide with the continental breakup and the opening of the North Atlantic Ocean over a period from 62 to 54 Ma. The unknown mantle structure under the North Atlantic during the Paleocene represents a major missing link in deciphering the geodynamic causes of this event. To address this outstanding challenge, we use a back-and-forth iterative method for time-reversed global convection modeling over the Cenozoic Era which incorporates models of present-day tomography-based mantle heterogeneity. We find that the Paleocene mantle under the North Atlantic is characterized by two major low-density plumes in the lower mantle: one beneath Greenland and another beneath the Azores. These strong lower-mantle upwellings generate small-scale hot upwellings and cold downwellings in the upper mantle. The upwellings are dispersed sources of magmatism and topographic uplift that were active on the rifted margins of the North Atlantic during the formation of the NAIP. While most studies of the Paleocene evolution of the North Atlantic have focused on the proto-Icelandic plume, our Cenozoic reconstructions reveal the equally important dynamics of a hot, buoyant, mantle-wide upwelling below the Azores. Text Greenland North Atlantic PubMed Central (PMC) Greenland Proceedings of the National Academy of Sciences 116 27 13227 13232 |
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Physical Sciences |
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Physical Sciences Glišović, Petar Forte, Alessandro M. Two deep-mantle sources for Paleocene doming and volcanism in the North Atlantic |
topic_facet |
Physical Sciences |
description |
The North Atlantic Igneous Province (NAIP) erupted in two major pulses that coincide with the continental breakup and the opening of the North Atlantic Ocean over a period from 62 to 54 Ma. The unknown mantle structure under the North Atlantic during the Paleocene represents a major missing link in deciphering the geodynamic causes of this event. To address this outstanding challenge, we use a back-and-forth iterative method for time-reversed global convection modeling over the Cenozoic Era which incorporates models of present-day tomography-based mantle heterogeneity. We find that the Paleocene mantle under the North Atlantic is characterized by two major low-density plumes in the lower mantle: one beneath Greenland and another beneath the Azores. These strong lower-mantle upwellings generate small-scale hot upwellings and cold downwellings in the upper mantle. The upwellings are dispersed sources of magmatism and topographic uplift that were active on the rifted margins of the North Atlantic during the formation of the NAIP. While most studies of the Paleocene evolution of the North Atlantic have focused on the proto-Icelandic plume, our Cenozoic reconstructions reveal the equally important dynamics of a hot, buoyant, mantle-wide upwelling below the Azores. |
format |
Text |
author |
Glišović, Petar Forte, Alessandro M. |
author_facet |
Glišović, Petar Forte, Alessandro M. |
author_sort |
Glišović, Petar |
title |
Two deep-mantle sources for Paleocene doming and volcanism in the North Atlantic |
title_short |
Two deep-mantle sources for Paleocene doming and volcanism in the North Atlantic |
title_full |
Two deep-mantle sources for Paleocene doming and volcanism in the North Atlantic |
title_fullStr |
Two deep-mantle sources for Paleocene doming and volcanism in the North Atlantic |
title_full_unstemmed |
Two deep-mantle sources for Paleocene doming and volcanism in the North Atlantic |
title_sort |
two deep-mantle sources for paleocene doming and volcanism in the north atlantic |
publisher |
National Academy of Sciences |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6612917/ http://www.ncbi.nlm.nih.gov/pubmed/31196961 https://doi.org/10.1073/pnas.1816188116 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6612917/ http://www.ncbi.nlm.nih.gov/pubmed/31196961 http://dx.doi.org/10.1073/pnas.1816188116 |
op_rights |
https://www.pnas.org/site/aboutpnas/licenses.xhtmlPublished under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . |
op_doi |
https://doi.org/10.1073/pnas.1816188116 |
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Proceedings of the National Academy of Sciences |
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116 |
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27 |
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13227 |
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13232 |
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