The mid-Cretaceous North Atlantic nutrient trap: black shales and OAEs
Organic-rich sediments are the salient marine sedimentation product in the mid-Cretaceous of the ocean basins formed in the Mesozoic. Oceanic anoxic events (OAEs) are discrete and particularly organic-rich intervals within these mid-Cretaceous organic-rich sequences and are defined by pronounced car...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/198480 2023-07-23T04:20:31+02:00 The mid-Cretaceous North Atlantic nutrient trap: black shales and OAEs Trabucho Alexandre, J. Tuenter, E. Henstra, G.A. Zwan, C.J. van der Wal, R.S.W. van de Dijkstra, H.A. Boer, P.L. de 2010 image/pdf https://dspace.library.uu.nl/handle/1874/198480 en eng 0883-8305 https://dspace.library.uu.nl/handle/1874/198480 info:eu-repo/semantics/OpenAccess Aardwetenschappen Natuur- en sterrenkunde organic‐rich sediments nutrients oceans climate models ocean basins deposition Article 2010 ftunivutrecht 2023-07-01T23:48:28Z Organic-rich sediments are the salient marine sedimentation product in the mid-Cretaceous of the ocean basins formed in the Mesozoic. Oceanic anoxic events (OAEs) are discrete and particularly organic-rich intervals within these mid-Cretaceous organic-rich sequences and are defined by pronounced carbon isotope excursions. Marine productivity during OAEs appears to have been enhanced by the increased availability of biolimiting nutrients in seawater due to hydrothermal alteration of submarine basalts in the Pacific and proto-Indian oceans. The exact mechanisms behind the deposition of organic-rich sediments in the mid-Cretaceous are still a matter of discussion, but a hypothesis which is often put forward is that their deposition was a consequence of the coupling of a particular paleogeography with changes in ocean circulation and nutrient supply. In this study, we used a global coupled climate model to investigate oceanic processes that affect the interbasinal exchange of nutrients as well as their spatial distribution and bioavailability. We conclude that the mid-Cretaceous North Atlantic was a nutrient trap as a consequence of an estuarine circulation with respect to the Pacific. Organic-rich sediments in the North Atlantic were deposited below regions of intense upwelling. We suggest that enhanced productivity during OAEs was a consequence of upwelling of Pacific-derived nutrient-rich seawater associated with submarine igneous events. Article in Journal/Newspaper North Atlantic Utrecht University Repository Indian Pacific |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Aardwetenschappen Natuur- en sterrenkunde organic‐rich sediments nutrients oceans climate models ocean basins deposition |
spellingShingle |
Aardwetenschappen Natuur- en sterrenkunde organic‐rich sediments nutrients oceans climate models ocean basins deposition Trabucho Alexandre, J. Tuenter, E. Henstra, G.A. Zwan, C.J. van der Wal, R.S.W. van de Dijkstra, H.A. Boer, P.L. de The mid-Cretaceous North Atlantic nutrient trap: black shales and OAEs |
topic_facet |
Aardwetenschappen Natuur- en sterrenkunde organic‐rich sediments nutrients oceans climate models ocean basins deposition |
description |
Organic-rich sediments are the salient marine sedimentation product in the mid-Cretaceous of the ocean basins formed in the Mesozoic. Oceanic anoxic events (OAEs) are discrete and particularly organic-rich intervals within these mid-Cretaceous organic-rich sequences and are defined by pronounced carbon isotope excursions. Marine productivity during OAEs appears to have been enhanced by the increased availability of biolimiting nutrients in seawater due to hydrothermal alteration of submarine basalts in the Pacific and proto-Indian oceans. The exact mechanisms behind the deposition of organic-rich sediments in the mid-Cretaceous are still a matter of discussion, but a hypothesis which is often put forward is that their deposition was a consequence of the coupling of a particular paleogeography with changes in ocean circulation and nutrient supply. In this study, we used a global coupled climate model to investigate oceanic processes that affect the interbasinal exchange of nutrients as well as their spatial distribution and bioavailability. We conclude that the mid-Cretaceous North Atlantic was a nutrient trap as a consequence of an estuarine circulation with respect to the Pacific. Organic-rich sediments in the North Atlantic were deposited below regions of intense upwelling. We suggest that enhanced productivity during OAEs was a consequence of upwelling of Pacific-derived nutrient-rich seawater associated with submarine igneous events. |
format |
Article in Journal/Newspaper |
author |
Trabucho Alexandre, J. Tuenter, E. Henstra, G.A. Zwan, C.J. van der Wal, R.S.W. van de Dijkstra, H.A. Boer, P.L. de |
author_facet |
Trabucho Alexandre, J. Tuenter, E. Henstra, G.A. Zwan, C.J. van der Wal, R.S.W. van de Dijkstra, H.A. Boer, P.L. de |
author_sort |
Trabucho Alexandre, J. |
title |
The mid-Cretaceous North Atlantic nutrient trap: black shales and OAEs |
title_short |
The mid-Cretaceous North Atlantic nutrient trap: black shales and OAEs |
title_full |
The mid-Cretaceous North Atlantic nutrient trap: black shales and OAEs |
title_fullStr |
The mid-Cretaceous North Atlantic nutrient trap: black shales and OAEs |
title_full_unstemmed |
The mid-Cretaceous North Atlantic nutrient trap: black shales and OAEs |
title_sort |
mid-cretaceous north atlantic nutrient trap: black shales and oaes |
publishDate |
2010 |
url |
https://dspace.library.uu.nl/handle/1874/198480 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
0883-8305 https://dspace.library.uu.nl/handle/1874/198480 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772184929645363200 |