Paleoceanographic changes during the Albian-Cenomanian in the Tethys and North Atlantic and the onset of the Cretaceous chalk
During the mid-Cretaceous the Earth was characterized by peculiar climatic and oceanographic features, such as very high temperatures, smooth thermal meridional gradient, long-term rising sea level, and formation of oceanic gateways and seaways. At that time widespread deposition of micritic pelagic...
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Online Access: | http://hdl.handle.net/2434/271125 https://doi.org/10.1016/j.gloplacha.2015.01.005 |
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ftunivmilanoair:oai:air.unimi.it:2434/271125 2024-01-28T10:07:29+01:00 Paleoceanographic changes during the Albian-Cenomanian in the Tethys and North Atlantic and the onset of the Cretaceous chalk M. Giorgioni H. Weissert S. M. Bernasconi P. A. Hochuli C. E. Keller R. Coccioni A. Lukeneder T. I. Garcia M.R. Petrizzo M. Giorgioni H. Weissert S.M. Bernasconi P.A. Hochuli C.E. Keller R. Coccioni M.R. Petrizzo A. Lukeneder T.I. Garcia 2015-03 http://hdl.handle.net/2434/271125 https://doi.org/10.1016/j.gloplacha.2015.01.005 eng eng Elsevier info:eu-repo/semantics/altIdentifier/wos/WOS:000350181300005 volume:126 firstpage:46 lastpage:61 numberofpages:16 journal:GLOBAL AND PLANETARY CHANGE http://hdl.handle.net/2434/271125 doi:10.1016/j.gloplacha.2015.01.005 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84921475231 info:eu-repo/semantics/closedAccess mid-Cretaceou Carbon isotope Tethy North Atlantic chalk paleoceanography Settore GEO/01 - Paleontologia e Paleoecologia Settore GEO/02 - Geologia Stratigrafica e Sedimentologica info:eu-repo/semantics/article 2015 ftunivmilanoair https://doi.org/10.1016/j.gloplacha.2015.01.005 2024-01-02T23:45:46Z During the mid-Cretaceous the Earth was characterized by peculiar climatic and oceanographic features, such as very high temperatures, smooth thermal meridional gradient, long-term rising sea level, and formation of oceanic gateways and seaways. At that time widespread deposition of micritic pelagic limestones, generally called chalk, occurred in deep pelagic settings as well as in epeiric seas, both at tropical and at high latitudes. The origin of such extensive chalk deposition in the mid-Cretaceous is a complex and still controversial issue, which involves the interaction of several different factors. In this work we address this topic from the paleoceanographic perspective, by investigating the contribution of major oceanic circulation changes.We characterize several stratigraphic sections from the Tethys and North Atlantic with litho-, bio-, and carbon isotope stratigraphy. Our data show a change between two different oceanic circulation modes happening in the Late Albian. The first is an unstable mode, with oceanographic conditions fluctuating frequently in response to rapid environmental and climatic changes, such as those driven by orbital forcing. The second mode is more stable, with better connection between the different oceanic basins, a more stable thermocline, more persistent current flow, better defined upwelling and downwelling areas, and a more balanced oceanic carbon reservoir. We propose that under the mid-Cretaceous paleogeographic and paleoclimatic conditions this change in oceanic circulation mode favored the beginning of chalk sedimentation in deep-water settings. Article in Journal/Newspaper North Atlantic The University of Milan: Archivio Istituzionale della Ricerca (AIR) Global and Planetary Change 126 46 61 |
institution |
Open Polar |
collection |
The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
op_collection_id |
ftunivmilanoair |
language |
English |
topic |
mid-Cretaceou Carbon isotope Tethy North Atlantic chalk paleoceanography Settore GEO/01 - Paleontologia e Paleoecologia Settore GEO/02 - Geologia Stratigrafica e Sedimentologica |
spellingShingle |
mid-Cretaceou Carbon isotope Tethy North Atlantic chalk paleoceanography Settore GEO/01 - Paleontologia e Paleoecologia Settore GEO/02 - Geologia Stratigrafica e Sedimentologica M. Giorgioni H. Weissert S. M. Bernasconi P. A. Hochuli C. E. Keller R. Coccioni A. Lukeneder T. I. Garcia M.R. Petrizzo Paleoceanographic changes during the Albian-Cenomanian in the Tethys and North Atlantic and the onset of the Cretaceous chalk |
topic_facet |
mid-Cretaceou Carbon isotope Tethy North Atlantic chalk paleoceanography Settore GEO/01 - Paleontologia e Paleoecologia Settore GEO/02 - Geologia Stratigrafica e Sedimentologica |
description |
During the mid-Cretaceous the Earth was characterized by peculiar climatic and oceanographic features, such as very high temperatures, smooth thermal meridional gradient, long-term rising sea level, and formation of oceanic gateways and seaways. At that time widespread deposition of micritic pelagic limestones, generally called chalk, occurred in deep pelagic settings as well as in epeiric seas, both at tropical and at high latitudes. The origin of such extensive chalk deposition in the mid-Cretaceous is a complex and still controversial issue, which involves the interaction of several different factors. In this work we address this topic from the paleoceanographic perspective, by investigating the contribution of major oceanic circulation changes.We characterize several stratigraphic sections from the Tethys and North Atlantic with litho-, bio-, and carbon isotope stratigraphy. Our data show a change between two different oceanic circulation modes happening in the Late Albian. The first is an unstable mode, with oceanographic conditions fluctuating frequently in response to rapid environmental and climatic changes, such as those driven by orbital forcing. The second mode is more stable, with better connection between the different oceanic basins, a more stable thermocline, more persistent current flow, better defined upwelling and downwelling areas, and a more balanced oceanic carbon reservoir. We propose that under the mid-Cretaceous paleogeographic and paleoclimatic conditions this change in oceanic circulation mode favored the beginning of chalk sedimentation in deep-water settings. |
author2 |
M. Giorgioni H. Weissert S.M. Bernasconi P.A. Hochuli C.E. Keller R. Coccioni M.R. Petrizzo A. Lukeneder T.I. Garcia |
format |
Article in Journal/Newspaper |
author |
M. Giorgioni H. Weissert S. M. Bernasconi P. A. Hochuli C. E. Keller R. Coccioni A. Lukeneder T. I. Garcia M.R. Petrizzo |
author_facet |
M. Giorgioni H. Weissert S. M. Bernasconi P. A. Hochuli C. E. Keller R. Coccioni A. Lukeneder T. I. Garcia M.R. Petrizzo |
author_sort |
M. Giorgioni |
title |
Paleoceanographic changes during the Albian-Cenomanian in the Tethys and North Atlantic and the onset of the Cretaceous chalk |
title_short |
Paleoceanographic changes during the Albian-Cenomanian in the Tethys and North Atlantic and the onset of the Cretaceous chalk |
title_full |
Paleoceanographic changes during the Albian-Cenomanian in the Tethys and North Atlantic and the onset of the Cretaceous chalk |
title_fullStr |
Paleoceanographic changes during the Albian-Cenomanian in the Tethys and North Atlantic and the onset of the Cretaceous chalk |
title_full_unstemmed |
Paleoceanographic changes during the Albian-Cenomanian in the Tethys and North Atlantic and the onset of the Cretaceous chalk |
title_sort |
paleoceanographic changes during the albian-cenomanian in the tethys and north atlantic and the onset of the cretaceous chalk |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://hdl.handle.net/2434/271125 https://doi.org/10.1016/j.gloplacha.2015.01.005 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000350181300005 volume:126 firstpage:46 lastpage:61 numberofpages:16 journal:GLOBAL AND PLANETARY CHANGE http://hdl.handle.net/2434/271125 doi:10.1016/j.gloplacha.2015.01.005 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84921475231 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.gloplacha.2015.01.005 |
container_title |
Global and Planetary Change |
container_volume |
126 |
container_start_page |
46 |
op_container_end_page |
61 |
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1789335266662547456 |