Planktonic foraminifers and environmental changes across the Bonarelli Event (OAE2, latest Cenomanian) in its type area: a high-resolution study from the Tethyan reference Bottacione section (Gubbio, central Italy)
The worldwide latest Cenomanian Oceanic Anoxic Event 2 (OAE2) was investigated for the planktonic foraminiferal assemblages in the type area of its sedimentare expression, the Corg–rich Bonarelli Level (Gubbio, central Italy). The 313 kyr preceding the onset of OAE2 and the 153 kyr following the end...
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ftunivferrarair:oai:iris.unife.it:11392/1204338 2024-02-11T10:08:03+01:00 Planktonic foraminifers and environmental changes across the Bonarelli Event (OAE2, latest Cenomanian) in its type area: a high-resolution study from the Tethyan reference Bottacione section (Gubbio, central Italy) Coccioni R. Luciani V. Coccioni, R. Luciani, V. 2004 STAMPA http://hdl.handle.net/11392/1204338 https://doi.org/10.2113/0340109 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000221746700004 volume:34 issue:2 firstpage:109 lastpage:129 numberofpages:21 journal:JOURNAL OF FORAMINIFERAL RESEARCH http://hdl.handle.net/11392/1204338 doi:10.2113/0340109 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-2942660174 Cretaceous anoxic event Bonarelli event Cenomanian planktonic foraminifera Umbria-Marche paleoecology paleoceanography info:eu-repo/semantics/article 2004 ftunivferrarair https://doi.org/10.2113/0340109 2024-01-24T17:34:33Z The worldwide latest Cenomanian Oceanic Anoxic Event 2 (OAE2) was investigated for the planktonic foraminiferal assemblages in the type area of its sedimentare expression, the Corg–rich Bonarelli Level (Gubbio, central Italy). The 313 kyr preceding the onset of OAE2 and the 153 kyr following the end of this event were analyzed in the deep-water setting of the Bottaccione section (Umbria-Marche Basin). For the first time, a highresolution approach and quantitative methods were applied.Several events and biotic changes, including the acme and crisis of different genera, were recognized. They provide evidence of a progressive and rapid deterioration of paleoenvironmental conditions, reaching a climax coincident with the Bonarelli Event, and of the subsequent, gradual (although not complete) recovery. Although no major mass extinction in planktonic foraminifera occurred across the Bonarelli Event, the extinction of the most specialized forms, i.e., the rotaliporids, and Globigerinelloides bentonensis, is recorded just bifore its onset. The observed pattern of marked changes in planktonic foraminiferal assemblages indicates five discrete phases of different degrees of environmental perturbation within the marine ecosystem. Phase I (313–55 kyr prior to the onset of OAE2) is characterized by a high planktonic foraminiferal abundance and diversity that imply a relatively stable environment, with different ecological niches occupied and stratified water column. On the other hand, relatively high percentages of hedbergellids and heterohelicids indicate a general meso-eutrophic environment and a well-developed oxygen minimum zone. Episodes of increased eutrophic conditions are indicated by pulses in abundance of radiolarians. A well-developed oxygen minimum zone may be related to a long-term change that precedes the onset of OAE2 (mid-Cenomanian Event). The most dramatic changes took place during Phase II and encompassed the last 55 kyr precedine deposition of the Bonarelli Level. The onset of a highstress environment is ... Article in Journal/Newspaper Planktonic foraminifera Università degli Studi di Ferrara: CINECA IRIS The Journal of Foraminiferal Research 34 2 109 129 |
institution |
Open Polar |
collection |
Università degli Studi di Ferrara: CINECA IRIS |
op_collection_id |
ftunivferrarair |
language |
English |
topic |
Cretaceous anoxic event Bonarelli event Cenomanian planktonic foraminifera Umbria-Marche paleoecology paleoceanography |
spellingShingle |
Cretaceous anoxic event Bonarelli event Cenomanian planktonic foraminifera Umbria-Marche paleoecology paleoceanography Coccioni R. Luciani V. Planktonic foraminifers and environmental changes across the Bonarelli Event (OAE2, latest Cenomanian) in its type area: a high-resolution study from the Tethyan reference Bottacione section (Gubbio, central Italy) |
topic_facet |
Cretaceous anoxic event Bonarelli event Cenomanian planktonic foraminifera Umbria-Marche paleoecology paleoceanography |
description |
The worldwide latest Cenomanian Oceanic Anoxic Event 2 (OAE2) was investigated for the planktonic foraminiferal assemblages in the type area of its sedimentare expression, the Corg–rich Bonarelli Level (Gubbio, central Italy). The 313 kyr preceding the onset of OAE2 and the 153 kyr following the end of this event were analyzed in the deep-water setting of the Bottaccione section (Umbria-Marche Basin). For the first time, a highresolution approach and quantitative methods were applied.Several events and biotic changes, including the acme and crisis of different genera, were recognized. They provide evidence of a progressive and rapid deterioration of paleoenvironmental conditions, reaching a climax coincident with the Bonarelli Event, and of the subsequent, gradual (although not complete) recovery. Although no major mass extinction in planktonic foraminifera occurred across the Bonarelli Event, the extinction of the most specialized forms, i.e., the rotaliporids, and Globigerinelloides bentonensis, is recorded just bifore its onset. The observed pattern of marked changes in planktonic foraminiferal assemblages indicates five discrete phases of different degrees of environmental perturbation within the marine ecosystem. Phase I (313–55 kyr prior to the onset of OAE2) is characterized by a high planktonic foraminiferal abundance and diversity that imply a relatively stable environment, with different ecological niches occupied and stratified water column. On the other hand, relatively high percentages of hedbergellids and heterohelicids indicate a general meso-eutrophic environment and a well-developed oxygen minimum zone. Episodes of increased eutrophic conditions are indicated by pulses in abundance of radiolarians. A well-developed oxygen minimum zone may be related to a long-term change that precedes the onset of OAE2 (mid-Cenomanian Event). The most dramatic changes took place during Phase II and encompassed the last 55 kyr precedine deposition of the Bonarelli Level. The onset of a highstress environment is ... |
author2 |
Coccioni, R. Luciani, V. |
format |
Article in Journal/Newspaper |
author |
Coccioni R. Luciani V. |
author_facet |
Coccioni R. Luciani V. |
author_sort |
Coccioni R. |
title |
Planktonic foraminifers and environmental changes across the Bonarelli Event (OAE2, latest Cenomanian) in its type area: a high-resolution study from the Tethyan reference Bottacione section (Gubbio, central Italy) |
title_short |
Planktonic foraminifers and environmental changes across the Bonarelli Event (OAE2, latest Cenomanian) in its type area: a high-resolution study from the Tethyan reference Bottacione section (Gubbio, central Italy) |
title_full |
Planktonic foraminifers and environmental changes across the Bonarelli Event (OAE2, latest Cenomanian) in its type area: a high-resolution study from the Tethyan reference Bottacione section (Gubbio, central Italy) |
title_fullStr |
Planktonic foraminifers and environmental changes across the Bonarelli Event (OAE2, latest Cenomanian) in its type area: a high-resolution study from the Tethyan reference Bottacione section (Gubbio, central Italy) |
title_full_unstemmed |
Planktonic foraminifers and environmental changes across the Bonarelli Event (OAE2, latest Cenomanian) in its type area: a high-resolution study from the Tethyan reference Bottacione section (Gubbio, central Italy) |
title_sort |
planktonic foraminifers and environmental changes across the bonarelli event (oae2, latest cenomanian) in its type area: a high-resolution study from the tethyan reference bottacione section (gubbio, central italy) |
publishDate |
2004 |
url |
http://hdl.handle.net/11392/1204338 https://doi.org/10.2113/0340109 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000221746700004 volume:34 issue:2 firstpage:109 lastpage:129 numberofpages:21 journal:JOURNAL OF FORAMINIFERAL RESEARCH http://hdl.handle.net/11392/1204338 doi:10.2113/0340109 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-2942660174 |
op_doi |
https://doi.org/10.2113/0340109 |
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The Journal of Foraminiferal Research |
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34 |
container_issue |
2 |
container_start_page |
109 |
op_container_end_page |
129 |
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