Sea bottom current activity recorded on the southern margin of the Vocontian basin (southeastern France) during the lower Aptian. Evidence for a climatic signal
International audience Numerous current marks are recorded on an Early Aptian unconformity surface observed over a large area of the Vocontian basin and its southern margin (southeastern France, Subalpine ranges). They Occur in the transition zone between that basin and the adjacent Provence platfor...
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ftunivlyon:oai:HAL:insu-00672693v1 2023-07-30T04:05:38+02:00 Sea bottom current activity recorded on the southern margin of the Vocontian basin (southeastern France) during the lower Aptian. Evidence for a climatic signal Cotillon, Pierre PaleoEnvironnements et PaleobioSphere (PEPS) Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2010 https://insu.hal.science/insu-00672693 https://doi.org/10.2113/gssgfbull.181.1.3 en eng HAL CCSD Société géologique de France - EDP Sciences info:eu-repo/semantics/altIdentifier/doi/10.2113/gssgfbull.181.1.3 insu-00672693 https://insu.hal.science/insu-00672693 doi:10.2113/gssgfbull.181.1.3 ISSN: 0037-9409 EISSN: 1777-5817 Bulletin de la Société Géologique de France https://insu.hal.science/insu-00672693 Bulletin de la Société Géologique de France, 2010, 181 (1), pp.3-18. ⟨10.2113/gssgfbull.181.1.3⟩ Early Aptian unconformity Current marks Upwellings Global cooling Southeastern France [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2010 ftunivlyon https://doi.org/10.2113/gssgfbull.181.1.3 2023-07-12T16:35:59Z International audience Numerous current marks are recorded on an Early Aptian unconformity surface observed over a large area of the Vocontian basin and its southern margin (southeastern France, Subalpine ranges). They Occur in the transition zone between that basin and the adjacent Provence platform and correspond to various erosion marks, oriented biogenic remains (sponge spicules, belemnite rostra) and trace fossil directions (Rhizocorallium). Three local current orientations occur : 1) a westward orientation in the neritic zone, probably resulting from the trade winds that prevailed in the Tethyan domain; 2) a northward orientation in the deeper hemipelagic and pelagic zones probably resulting from a deviation of the westward Currents by the Coriolis force; 3) a southward orientation in the eastern and western margins of the studied area, possibly induced by upwellings resulting from offshore northward deviated currents. These upwellings were characterized by cold ater enriched with silica, phosphorous and organic matter. Some characteristics of the Early Aptian unconformity surface re suit from these different currents : 1) a specific type of erosion linked to mechanical and/or chemical features, 2) all erosion intensity displayed by the importance of the pre-Aptian stratigraphic gaps, 3) an erosion duration illustrated by the importance of the post-Aptian gaps. The spatial distribution of these features was controlled by the water-depth, depending locally on the occurrence of hemipelagic submarine reliefs of tectonic origin. Increases in current activity in the Early Aptian, linked to an acceleration of the atmospheric circulation, and highlighed by erosion and phosphatisation had previously been recorded for many other Eurasian and North Atlantic sites. This large spatial distribution suggests a global cause Such as a temporary increase in the latitudinal thermal gradient and seasonal contrasts. According to the literature, these events may be related to the Early Aptian cooling, described by several ... Article in Journal/Newspaper North Atlantic Université de Lyon: HAL Bulletin de la Société Géologique de France 181 1 3 18 |
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Open Polar |
collection |
Université de Lyon: HAL |
op_collection_id |
ftunivlyon |
language |
English |
topic |
Early Aptian unconformity Current marks Upwellings Global cooling Southeastern France [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Early Aptian unconformity Current marks Upwellings Global cooling Southeastern France [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Cotillon, Pierre Sea bottom current activity recorded on the southern margin of the Vocontian basin (southeastern France) during the lower Aptian. Evidence for a climatic signal |
topic_facet |
Early Aptian unconformity Current marks Upwellings Global cooling Southeastern France [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Numerous current marks are recorded on an Early Aptian unconformity surface observed over a large area of the Vocontian basin and its southern margin (southeastern France, Subalpine ranges). They Occur in the transition zone between that basin and the adjacent Provence platform and correspond to various erosion marks, oriented biogenic remains (sponge spicules, belemnite rostra) and trace fossil directions (Rhizocorallium). Three local current orientations occur : 1) a westward orientation in the neritic zone, probably resulting from the trade winds that prevailed in the Tethyan domain; 2) a northward orientation in the deeper hemipelagic and pelagic zones probably resulting from a deviation of the westward Currents by the Coriolis force; 3) a southward orientation in the eastern and western margins of the studied area, possibly induced by upwellings resulting from offshore northward deviated currents. These upwellings were characterized by cold ater enriched with silica, phosphorous and organic matter. Some characteristics of the Early Aptian unconformity surface re suit from these different currents : 1) a specific type of erosion linked to mechanical and/or chemical features, 2) all erosion intensity displayed by the importance of the pre-Aptian stratigraphic gaps, 3) an erosion duration illustrated by the importance of the post-Aptian gaps. The spatial distribution of these features was controlled by the water-depth, depending locally on the occurrence of hemipelagic submarine reliefs of tectonic origin. Increases in current activity in the Early Aptian, linked to an acceleration of the atmospheric circulation, and highlighed by erosion and phosphatisation had previously been recorded for many other Eurasian and North Atlantic sites. This large spatial distribution suggests a global cause Such as a temporary increase in the latitudinal thermal gradient and seasonal contrasts. According to the literature, these events may be related to the Early Aptian cooling, described by several ... |
author2 |
PaleoEnvironnements et PaleobioSphere (PEPS) Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Cotillon, Pierre |
author_facet |
Cotillon, Pierre |
author_sort |
Cotillon, Pierre |
title |
Sea bottom current activity recorded on the southern margin of the Vocontian basin (southeastern France) during the lower Aptian. Evidence for a climatic signal |
title_short |
Sea bottom current activity recorded on the southern margin of the Vocontian basin (southeastern France) during the lower Aptian. Evidence for a climatic signal |
title_full |
Sea bottom current activity recorded on the southern margin of the Vocontian basin (southeastern France) during the lower Aptian. Evidence for a climatic signal |
title_fullStr |
Sea bottom current activity recorded on the southern margin of the Vocontian basin (southeastern France) during the lower Aptian. Evidence for a climatic signal |
title_full_unstemmed |
Sea bottom current activity recorded on the southern margin of the Vocontian basin (southeastern France) during the lower Aptian. Evidence for a climatic signal |
title_sort |
sea bottom current activity recorded on the southern margin of the vocontian basin (southeastern france) during the lower aptian. evidence for a climatic signal |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://insu.hal.science/insu-00672693 https://doi.org/10.2113/gssgfbull.181.1.3 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0037-9409 EISSN: 1777-5817 Bulletin de la Société Géologique de France https://insu.hal.science/insu-00672693 Bulletin de la Société Géologique de France, 2010, 181 (1), pp.3-18. ⟨10.2113/gssgfbull.181.1.3⟩ |
op_relation |
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op_doi |
https://doi.org/10.2113/gssgfbull.181.1.3 |
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Bulletin de la Société Géologique de France |
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181 |
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