Planktonic foraminifera document palaeoceanographic changes across the middle Cenomanian carbon-isotope excursion MCE 1: new evidence from the UK chalk
Planktonic foraminifera were studied at Lydden Spout, near Folkestone (southeast England, UK), the reference section of the middle Cenomanian Event 1 (MCE 1) characterized by a prominent double-peak delta C-13 excursion of 1 parts per thousand identified in different ocean basins and considered a gl...
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Cambridge University Press
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Online Access: | https://hdl.handle.net/2434/953197 https://doi.org/10.1017/S0016756822000991 |
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ftunivmilanoair:oai:air.unimi.it:2434/953197 2024-01-28T10:08:13+01:00 Planktonic foraminifera document palaeoceanographic changes across the middle Cenomanian carbon-isotope excursion MCE 1: new evidence from the UK chalk Petrizzo, MR Gale, AS M. Petrizzo A. Gale 2022 https://hdl.handle.net/2434/953197 https://doi.org/10.1017/S0016756822000991 eng eng Cambridge University Press info:eu-repo/semantics/altIdentifier/wos/WOS:000891062000001 firstpage:1 lastpage:21 numberofpages:21 journal:GEOLOGICAL MAGAZINE https://hdl.handle.net/2434/953197 doi:10.1017/S0016756822000991 info:eu-repo/semantics/openAccess planktonic foraminifera middle Cenomanian Event 1 (MCE 1) palaeoceanography carbon and oxygen stable isotope England Settore GEO/01 - Paleontologia e Paleoecologia info:eu-repo/semantics/article 2022 ftunivmilanoair https://doi.org/10.1017/S0016756822000991 2024-01-02T23:55:32Z Planktonic foraminifera were studied at Lydden Spout, near Folkestone (southeast England, UK), the reference section of the middle Cenomanian Event 1 (MCE 1) characterized by a prominent double-peak delta C-13 excursion of 1 parts per thousand identified in different ocean basins and considered a global event. Biostratigraphic and quantitative analysis of planktonic foraminifera are correlated to the delta C-13 perturbation, to the positive delta O-18 shifts identified within MCE 1 and to the occurrence of Boreal macrofossils (the bivalves Chlamys arlesiensis and Oxytoma seminudum, and the belemnite Praectinocamax primus). Variations in abundance and species richness of planktonic foraminifera and the inferred palaeoecological preferences of taxa permit the identification of distinct palaeoenvironmental settings across MCE 1. The stratigraphic interval corresponding to MCE 1 is characterized by the absence of oligotrophic rotaliporids, and by the evolutionary appearance of meso-eutrophic dicarinellids and of Muricohedbergella portsdownensis, a cold-water species that occurs at the same level as the Boreal macrofossils. These observations indicate a palaeoceanographic scenario characterized by reduced stratification of surface waters and absence/disruption of the thermocline in a dominantly eutrophic regime during MCE 1. Evidence provided by planktonic foraminifera, Boreal macrofossils and delta O-18 records documented for the late Cenomanian Plenus Cold Event (PCE) at Eastbourne (UK) reveal similarities that confirm the periodic inflow of cold Boreal seawater originating in the Norwegian Sea as previously postulated to explain the occurrence of Boreal fauna in the Anglo-Paris Basin. The southerly extension of this water mass may be related to the reorganization of circulation driven by the long eccentricity cycle. Article in Journal/Newspaper Norwegian Sea Planktonic foraminifera The University of Milan: Archivio Istituzionale della Ricerca (AIR) Norwegian Sea Geological Magazine 1 21 |
institution |
Open Polar |
collection |
The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
op_collection_id |
ftunivmilanoair |
language |
English |
topic |
planktonic foraminifera middle Cenomanian Event 1 (MCE 1) palaeoceanography carbon and oxygen stable isotope England Settore GEO/01 - Paleontologia e Paleoecologia |
spellingShingle |
planktonic foraminifera middle Cenomanian Event 1 (MCE 1) palaeoceanography carbon and oxygen stable isotope England Settore GEO/01 - Paleontologia e Paleoecologia Petrizzo, MR Gale, AS Planktonic foraminifera document palaeoceanographic changes across the middle Cenomanian carbon-isotope excursion MCE 1: new evidence from the UK chalk |
topic_facet |
planktonic foraminifera middle Cenomanian Event 1 (MCE 1) palaeoceanography carbon and oxygen stable isotope England Settore GEO/01 - Paleontologia e Paleoecologia |
description |
Planktonic foraminifera were studied at Lydden Spout, near Folkestone (southeast England, UK), the reference section of the middle Cenomanian Event 1 (MCE 1) characterized by a prominent double-peak delta C-13 excursion of 1 parts per thousand identified in different ocean basins and considered a global event. Biostratigraphic and quantitative analysis of planktonic foraminifera are correlated to the delta C-13 perturbation, to the positive delta O-18 shifts identified within MCE 1 and to the occurrence of Boreal macrofossils (the bivalves Chlamys arlesiensis and Oxytoma seminudum, and the belemnite Praectinocamax primus). Variations in abundance and species richness of planktonic foraminifera and the inferred palaeoecological preferences of taxa permit the identification of distinct palaeoenvironmental settings across MCE 1. The stratigraphic interval corresponding to MCE 1 is characterized by the absence of oligotrophic rotaliporids, and by the evolutionary appearance of meso-eutrophic dicarinellids and of Muricohedbergella portsdownensis, a cold-water species that occurs at the same level as the Boreal macrofossils. These observations indicate a palaeoceanographic scenario characterized by reduced stratification of surface waters and absence/disruption of the thermocline in a dominantly eutrophic regime during MCE 1. Evidence provided by planktonic foraminifera, Boreal macrofossils and delta O-18 records documented for the late Cenomanian Plenus Cold Event (PCE) at Eastbourne (UK) reveal similarities that confirm the periodic inflow of cold Boreal seawater originating in the Norwegian Sea as previously postulated to explain the occurrence of Boreal fauna in the Anglo-Paris Basin. The southerly extension of this water mass may be related to the reorganization of circulation driven by the long eccentricity cycle. |
author2 |
M. Petrizzo A. Gale |
format |
Article in Journal/Newspaper |
author |
Petrizzo, MR Gale, AS |
author_facet |
Petrizzo, MR Gale, AS |
author_sort |
Petrizzo, MR |
title |
Planktonic foraminifera document palaeoceanographic changes across the middle Cenomanian carbon-isotope excursion MCE 1: new evidence from the UK chalk |
title_short |
Planktonic foraminifera document palaeoceanographic changes across the middle Cenomanian carbon-isotope excursion MCE 1: new evidence from the UK chalk |
title_full |
Planktonic foraminifera document palaeoceanographic changes across the middle Cenomanian carbon-isotope excursion MCE 1: new evidence from the UK chalk |
title_fullStr |
Planktonic foraminifera document palaeoceanographic changes across the middle Cenomanian carbon-isotope excursion MCE 1: new evidence from the UK chalk |
title_full_unstemmed |
Planktonic foraminifera document palaeoceanographic changes across the middle Cenomanian carbon-isotope excursion MCE 1: new evidence from the UK chalk |
title_sort |
planktonic foraminifera document palaeoceanographic changes across the middle cenomanian carbon-isotope excursion mce 1: new evidence from the uk chalk |
publisher |
Cambridge University Press |
publishDate |
2022 |
url |
https://hdl.handle.net/2434/953197 https://doi.org/10.1017/S0016756822000991 |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Norwegian Sea Planktonic foraminifera |
genre_facet |
Norwegian Sea Planktonic foraminifera |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000891062000001 firstpage:1 lastpage:21 numberofpages:21 journal:GEOLOGICAL MAGAZINE https://hdl.handle.net/2434/953197 doi:10.1017/S0016756822000991 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/S0016756822000991 |
container_title |
Geological Magazine |
container_start_page |
1 |
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21 |
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1789336729590693888 |