Mean age of oceanic lithosphere drives eustatic sea-level change since Pangea breakup, Earth Planet
Abstract The Atlantic and Indian Oceans and the oceanic part of the Antarctic plate have formed at the expense of Panthalassa as a result of Pangea breakup over the last 180 Myr. This major plate reorganization has changed the age vs. surface distribution of oceanic lithosphere and has been a likely...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1054.1755 2023-05-15T13:31:12+02:00 Mean age of oceanic lithosphere drives eustatic sea-level change since Pangea breakup, Earth Planet Jean-Pascal Cogné Eric Humler Vincent Courtillot The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1054.1755 http://www.ipgp.fr/%7Ecogne/pub/site_perso/Articles/2006_Sealevel_EPSL.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1054.1755 http://www.ipgp.fr/%7Ecogne/pub/site_perso/Articles/2006_Sealevel_EPSL.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.ipgp.fr/%7Ecogne/pub/site_perso/Articles/2006_Sealevel_EPSL.pdf text ftciteseerx 2020-04-12T00:19:19Z Abstract The Atlantic and Indian Oceans and the oceanic part of the Antarctic plate have formed at the expense of Panthalassa as a result of Pangea breakup over the last 180 Myr. This major plate reorganization has changed the age vs. surface distribution of oceanic lithosphere and has been a likely driver of sea-level change. Assuming that the age/surface structure of Panthalassa has remained similar to the present-day global distribution from 180 Ma to Present, and using the isochron patterns preserved in the newly formed oceans, we model resulting relative sea-level change. We find a first (slower) phase of sea-level rise (by 90 to 110 m), culminating between 120 and 50 Ma, followed by a (faster) phase of sea-level drop. We show that this result is not strongly sensitive to our hypothesis of constant mean age of Panthalassa, for which much of the information is now erased due to subduction. When the effects of oceanic plateau formation and ice cap development are added, the predicted sea-level curve fits remarkably well the first-order variations of observed sea-level change. We conclude that the changes in mean age of the oceanic lithosphere (varying between 56 and 62 ± 0.2 Myr), which are simply the expression of the Wilson cycle following Pangea breakup, are the main control, accounting for ∼ 70%, of first-order changes in sea-level. Text Antarc* Antarctic Ice cap Unknown Antarctic Indian The Antarctic |
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English |
description |
Abstract The Atlantic and Indian Oceans and the oceanic part of the Antarctic plate have formed at the expense of Panthalassa as a result of Pangea breakup over the last 180 Myr. This major plate reorganization has changed the age vs. surface distribution of oceanic lithosphere and has been a likely driver of sea-level change. Assuming that the age/surface structure of Panthalassa has remained similar to the present-day global distribution from 180 Ma to Present, and using the isochron patterns preserved in the newly formed oceans, we model resulting relative sea-level change. We find a first (slower) phase of sea-level rise (by 90 to 110 m), culminating between 120 and 50 Ma, followed by a (faster) phase of sea-level drop. We show that this result is not strongly sensitive to our hypothesis of constant mean age of Panthalassa, for which much of the information is now erased due to subduction. When the effects of oceanic plateau formation and ice cap development are added, the predicted sea-level curve fits remarkably well the first-order variations of observed sea-level change. We conclude that the changes in mean age of the oceanic lithosphere (varying between 56 and 62 ± 0.2 Myr), which are simply the expression of the Wilson cycle following Pangea breakup, are the main control, accounting for ∼ 70%, of first-order changes in sea-level. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Jean-Pascal Cogné Eric Humler Vincent Courtillot |
spellingShingle |
Jean-Pascal Cogné Eric Humler Vincent Courtillot Mean age of oceanic lithosphere drives eustatic sea-level change since Pangea breakup, Earth Planet |
author_facet |
Jean-Pascal Cogné Eric Humler Vincent Courtillot |
author_sort |
Jean-Pascal Cogné |
title |
Mean age of oceanic lithosphere drives eustatic sea-level change since Pangea breakup, Earth Planet |
title_short |
Mean age of oceanic lithosphere drives eustatic sea-level change since Pangea breakup, Earth Planet |
title_full |
Mean age of oceanic lithosphere drives eustatic sea-level change since Pangea breakup, Earth Planet |
title_fullStr |
Mean age of oceanic lithosphere drives eustatic sea-level change since Pangea breakup, Earth Planet |
title_full_unstemmed |
Mean age of oceanic lithosphere drives eustatic sea-level change since Pangea breakup, Earth Planet |
title_sort |
mean age of oceanic lithosphere drives eustatic sea-level change since pangea breakup, earth planet |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1054.1755 http://www.ipgp.fr/%7Ecogne/pub/site_perso/Articles/2006_Sealevel_EPSL.pdf |
geographic |
Antarctic Indian The Antarctic |
geographic_facet |
Antarctic Indian The Antarctic |
genre |
Antarc* Antarctic Ice cap |
genre_facet |
Antarc* Antarctic Ice cap |
op_source |
http://www.ipgp.fr/%7Ecogne/pub/site_perso/Articles/2006_Sealevel_EPSL.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1054.1755 http://www.ipgp.fr/%7Ecogne/pub/site_perso/Articles/2006_Sealevel_EPSL.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766016613815943168 |