A new scenario for the Domerian-Toarcian transition
In contrast to the majority of recently published hypotheses, we believe that the main trigger for early Toarcian anoxia is neither increased primary productivity during the Tenuicostatum and Falciferum Zones nor sudden methane hydrate degassing close to the transition between these two zones. In ou...
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fttriple:oai:gotriple.eu:10670/1.l2e52x 2023-05-15T17:11:57+02:00 A new scenario for the Domerian-Toarcian transition Morard, A. Guex, J. Bartolini, A. Morettini, E. De Wever, P. 2003-01-01 https://doi.org/10.2113/174.4.351 https://serval.unil.ch/notice/serval:BIB_367E64EBFBE3 en eng doi:10.2113/174.4.351 urn:issn:0037-9409 10670/1.l2e52x https://serval.unil.ch/notice/serval:BIB_367E64EBFBE3 undefined Serveur académique Lausannois Bulletin de la Société Géologique de France, vol. 174, pp. 351-356 geo hist Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2003 fttriple https://doi.org/10.2113/174.4.351 2023-01-22T18:20:21Z In contrast to the majority of recently published hypotheses, we believe that the main trigger for early Toarcian anoxia is neither increased primary productivity during the Tenuicostatum and Falciferum Zones nor sudden methane hydrate degassing close to the transition between these two zones. In our opinion, this peculiar paleoceanographic episode is linked to a major, though short-lived, regression at the end of Upper Domerian. Sea-level fall resulted from sudden cooling due to increased volcanic activity. This generated global thermal insulation and subsequent glaciation. The regression is responsible for a major hiatus over NW-European epicontinental seas and is later followed by the well-known Lower Toarcian transgression. The interval corresponding to this hiatus allowed vegetation to colonise vast newly emerged surfaces. The leaching and drowning of the accumulated organo-humic matter then triggered the anoxic cycle at the transgressive maximum, concomitant with a global warming. Article in Journal/Newspaper Methane hydrate Unknown Bulletin de la Société Géologique de France 174 4 351 356 |
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English |
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geo hist Morard, A. Guex, J. Bartolini, A. Morettini, E. De Wever, P. A new scenario for the Domerian-Toarcian transition |
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geo hist |
description |
In contrast to the majority of recently published hypotheses, we believe that the main trigger for early Toarcian anoxia is neither increased primary productivity during the Tenuicostatum and Falciferum Zones nor sudden methane hydrate degassing close to the transition between these two zones. In our opinion, this peculiar paleoceanographic episode is linked to a major, though short-lived, regression at the end of Upper Domerian. Sea-level fall resulted from sudden cooling due to increased volcanic activity. This generated global thermal insulation and subsequent glaciation. The regression is responsible for a major hiatus over NW-European epicontinental seas and is later followed by the well-known Lower Toarcian transgression. The interval corresponding to this hiatus allowed vegetation to colonise vast newly emerged surfaces. The leaching and drowning of the accumulated organo-humic matter then triggered the anoxic cycle at the transgressive maximum, concomitant with a global warming. |
format |
Article in Journal/Newspaper |
author |
Morard, A. Guex, J. Bartolini, A. Morettini, E. De Wever, P. |
author_facet |
Morard, A. Guex, J. Bartolini, A. Morettini, E. De Wever, P. |
author_sort |
Morard, A. |
title |
A new scenario for the Domerian-Toarcian transition |
title_short |
A new scenario for the Domerian-Toarcian transition |
title_full |
A new scenario for the Domerian-Toarcian transition |
title_fullStr |
A new scenario for the Domerian-Toarcian transition |
title_full_unstemmed |
A new scenario for the Domerian-Toarcian transition |
title_sort |
new scenario for the domerian-toarcian transition |
publishDate |
2003 |
url |
https://doi.org/10.2113/174.4.351 https://serval.unil.ch/notice/serval:BIB_367E64EBFBE3 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Serveur académique Lausannois Bulletin de la Société Géologique de France, vol. 174, pp. 351-356 |
op_relation |
doi:10.2113/174.4.351 urn:issn:0037-9409 10670/1.l2e52x https://serval.unil.ch/notice/serval:BIB_367E64EBFBE3 |
op_rights |
undefined |
op_doi |
https://doi.org/10.2113/174.4.351 |
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Bulletin de la Société Géologique de France |
container_volume |
174 |
container_issue |
4 |
container_start_page |
351 |
op_container_end_page |
356 |
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1766068717424214016 |