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...
Published in: | Bulletin de la Société Géologique de France |
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ftunivlausanne:oai:serval.unil.ch:BIB_367E64EBFBE3 2024-02-11T10:05:49+01:00 A new scenario for the Domerian-Toarcian transition Morard, A. Guex, J. Bartolini, A. Morettini, E. De Wever, P. 2003 https://serval.unil.ch/notice/serval:BIB_367E64EBFBE3 https://doi.org/10.2113/174.4.351 eng eng info:eu-repo/semantics/altIdentifier/doi/10.2113/174.4.351 https://serval.unil.ch/notice/serval:BIB_367E64EBFBE3 doi:10.2113/174.4.351 urn:issn:0037-9409 Bulletin de la Société Géologique de France, vol. 174, pp. 351-356 info:eu-repo/semantics/article article 2003 ftunivlausanne https://doi.org/10.2113/174.4.351 2024-01-22T01:13:32Z 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 Université de Lausanne (UNIL): Serval - Serveur académique lausannois Bulletin de la Société Géologique de France 174 4 351 356 |
institution |
Open Polar |
collection |
Université de Lausanne (UNIL): Serval - Serveur académique lausannois |
op_collection_id |
ftunivlausanne |
language |
English |
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. |
spellingShingle |
Morard, A. Guex, J. Bartolini, A. Morettini, E. De Wever, P. A new scenario for the Domerian-Toarcian transition |
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://serval.unil.ch/notice/serval:BIB_367E64EBFBE3 https://doi.org/10.2113/174.4.351 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Bulletin de la Société Géologique de France, vol. 174, pp. 351-356 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.2113/174.4.351 https://serval.unil.ch/notice/serval:BIB_367E64EBFBE3 doi:10.2113/174.4.351 urn:issn:0037-9409 |
op_doi |
https://doi.org/10.2113/174.4.351 |
container_title |
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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1790603007346343936 |