Paleoceanographic inferences from benthic foraminifera across the early Aptian Ocean Anoxic Event 1a in the western Tethys
The paleoenvironmental impact of the early Aptian Ocean Anoxic Event 1a (OAE 1a, ca. 121 Ma) has been investigated in detail in the Cismon Core (Lombardy Basin, western Tethys) by using different geochemical and micropaleontological proxies. We provide the first high-resolution data of benthic foram...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Online Access: | http://hdl.handle.net/2434/899060 https://doi.org/10.1016/j.palaeo.2021.110803 |
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ftunivmilanoair:oai:air.unimi.it:2434/899060 2024-02-11T10:08:03+01:00 Paleoceanographic inferences from benthic foraminifera across the early Aptian Ocean Anoxic Event 1a in the western Tethys Victor Giraldo-Gómez Maria Rose Petrizzo Elisabetta Erba Cinzia Bottini G. Victor M.R. Petrizzo E. Erba C. Bottini 2022-02-15 http://hdl.handle.net/2434/899060 https://doi.org/10.1016/j.palaeo.2021.110803 eng eng Elsevier info:eu-repo/semantics/altIdentifier/wos/WOS:000789224200004 volume:588 firstpage:1 lastpage:19 numberofpages:19 journal:PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://hdl.handle.net/2434/899060 doi:10.1016/j.palaeo.2021.110803 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85122320427 info:eu-repo/semantics/openAccess Anoxia Calcareous nannofossil Cismon Core OAE 1a Paleoceanography Planktonic foraminifera Settore GEO/01 - Paleontologia e Paleoecologia info:eu-repo/semantics/article 2022 ftunivmilanoair https://doi.org/10.1016/j.palaeo.2021.110803 2024-01-23T23:43:13Z The paleoenvironmental impact of the early Aptian Ocean Anoxic Event 1a (OAE 1a, ca. 121 Ma) has been investigated in detail in the Cismon Core (Lombardy Basin, western Tethys) by using different geochemical and micropaleontological proxies. We provide the first high-resolution data of benthic foraminiferal assemblages through the upper Barremian - lower upper Aptian stratigraphic interval. Benthic foraminifera data are integrated with calcareous nannofossil and planktonic foraminifera records to create a comprehensive characterization of bottom and surface waters across OAE 1a. Benthic foraminiferal communities are indicative of a marked change in bottom-waters around the “nannoconid decline” (latest Barremian) due to increased flux of organic matter to the seafloor and intermittent dysoxic conditions probably promoted by pulses of higher productivity during the initial Greater Ontong Java Event (GOJE). Benthic foraminifera experienced a marked crisis in abundance (“benthic foraminiferal crisis” BFC) ca. 35 kyr before the OAE 1a, in correspondence with the “nannoconid crisis” and the onset of the most intense GOJE phase. The literature survey shows that the BFC is commonly recorded before the OAE 1a onset in several stratigraphic sections worldwide, and therefore, it is here proposed as a global event. At Cismon, deep-water anoxia was reached at the OAE 1a onset and lasted for ca. 300 kyr, promoted by higher productivity and eventually enhanced water stratification during the super-greenhouse climate. The continuation of OAE 1a was marked by a benthic foraminiferal repopulation event, probably resulting from the influx of relatively cooler and oxygenated waters. In turn, the OAE 1a was marked by intermittent anoxic to dysoxic conditions, likely in response to primary productivity sustained by N-fixing bacteria. The distribution and abundance of benthic foraminifera documented in other sections across the Selli Level equivalent show different features that point to local factors such as paleodepth and increased ... Article in Journal/Newspaper Planktonic foraminifera The University of Milan: Archivio Istituzionale della Ricerca (AIR) Palaeogeography, Palaeoclimatology, Palaeoecology 588 110803 |
institution |
Open Polar |
collection |
The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
op_collection_id |
ftunivmilanoair |
language |
English |
topic |
Anoxia Calcareous nannofossil Cismon Core OAE 1a Paleoceanography Planktonic foraminifera Settore GEO/01 - Paleontologia e Paleoecologia |
spellingShingle |
Anoxia Calcareous nannofossil Cismon Core OAE 1a Paleoceanography Planktonic foraminifera Settore GEO/01 - Paleontologia e Paleoecologia Victor Giraldo-Gómez Maria Rose Petrizzo Elisabetta Erba Cinzia Bottini Paleoceanographic inferences from benthic foraminifera across the early Aptian Ocean Anoxic Event 1a in the western Tethys |
topic_facet |
Anoxia Calcareous nannofossil Cismon Core OAE 1a Paleoceanography Planktonic foraminifera Settore GEO/01 - Paleontologia e Paleoecologia |
description |
The paleoenvironmental impact of the early Aptian Ocean Anoxic Event 1a (OAE 1a, ca. 121 Ma) has been investigated in detail in the Cismon Core (Lombardy Basin, western Tethys) by using different geochemical and micropaleontological proxies. We provide the first high-resolution data of benthic foraminiferal assemblages through the upper Barremian - lower upper Aptian stratigraphic interval. Benthic foraminifera data are integrated with calcareous nannofossil and planktonic foraminifera records to create a comprehensive characterization of bottom and surface waters across OAE 1a. Benthic foraminiferal communities are indicative of a marked change in bottom-waters around the “nannoconid decline” (latest Barremian) due to increased flux of organic matter to the seafloor and intermittent dysoxic conditions probably promoted by pulses of higher productivity during the initial Greater Ontong Java Event (GOJE). Benthic foraminifera experienced a marked crisis in abundance (“benthic foraminiferal crisis” BFC) ca. 35 kyr before the OAE 1a, in correspondence with the “nannoconid crisis” and the onset of the most intense GOJE phase. The literature survey shows that the BFC is commonly recorded before the OAE 1a onset in several stratigraphic sections worldwide, and therefore, it is here proposed as a global event. At Cismon, deep-water anoxia was reached at the OAE 1a onset and lasted for ca. 300 kyr, promoted by higher productivity and eventually enhanced water stratification during the super-greenhouse climate. The continuation of OAE 1a was marked by a benthic foraminiferal repopulation event, probably resulting from the influx of relatively cooler and oxygenated waters. In turn, the OAE 1a was marked by intermittent anoxic to dysoxic conditions, likely in response to primary productivity sustained by N-fixing bacteria. The distribution and abundance of benthic foraminifera documented in other sections across the Selli Level equivalent show different features that point to local factors such as paleodepth and increased ... |
author2 |
G. Victor M.R. Petrizzo E. Erba C. Bottini |
format |
Article in Journal/Newspaper |
author |
Victor Giraldo-Gómez Maria Rose Petrizzo Elisabetta Erba Cinzia Bottini |
author_facet |
Victor Giraldo-Gómez Maria Rose Petrizzo Elisabetta Erba Cinzia Bottini |
author_sort |
Victor Giraldo-Gómez |
title |
Paleoceanographic inferences from benthic foraminifera across the early Aptian Ocean Anoxic Event 1a in the western Tethys |
title_short |
Paleoceanographic inferences from benthic foraminifera across the early Aptian Ocean Anoxic Event 1a in the western Tethys |
title_full |
Paleoceanographic inferences from benthic foraminifera across the early Aptian Ocean Anoxic Event 1a in the western Tethys |
title_fullStr |
Paleoceanographic inferences from benthic foraminifera across the early Aptian Ocean Anoxic Event 1a in the western Tethys |
title_full_unstemmed |
Paleoceanographic inferences from benthic foraminifera across the early Aptian Ocean Anoxic Event 1a in the western Tethys |
title_sort |
paleoceanographic inferences from benthic foraminifera across the early aptian ocean anoxic event 1a in the western tethys |
publisher |
Elsevier |
publishDate |
2022 |
url |
http://hdl.handle.net/2434/899060 https://doi.org/10.1016/j.palaeo.2021.110803 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000789224200004 volume:588 firstpage:1 lastpage:19 numberofpages:19 journal:PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://hdl.handle.net/2434/899060 doi:10.1016/j.palaeo.2021.110803 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85122320427 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.palaeo.2021.110803 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
588 |
container_start_page |
110803 |
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1790606987886592000 |