Cargando…

Biotic and Paleoceanographic Changes Across the Late Cretaceous Oceanic Anoxic Event 2 in the Southern High Latitudes (IODP Sites U1513 and U1516, SE Indian Ocean)

Oceanic Anoxic Event 2, spanning the Cenomanian/Turonian boundary (93.9 Ma), was an episode of major perturbations in the global carbon cycle. To investigate the response of biota and the paleoceanographic conditions across this event, we present data from International Ocean Discovery Program sites...

Descripción completa

Detalles Bibliográficos
Autores principales: Petrizzo, Maria Rose, Amaglio, Giulia, Watkins, David K., MacLeod, Kenneth G., Huber, Brian T., Hasegawa, Takashi, Wolfgring, Erik
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9545577/
https://www.ncbi.nlm.nih.gov/pubmed/36247808
http://dx.doi.org/10.1029/2022PA004474
_version_ 1784804850968559616
author Petrizzo, Maria Rose
Amaglio, Giulia
Watkins, David K.
MacLeod, Kenneth G.
Huber, Brian T.
Hasegawa, Takashi
Wolfgring, Erik
author_facet Petrizzo, Maria Rose
Amaglio, Giulia
Watkins, David K.
MacLeod, Kenneth G.
Huber, Brian T.
Hasegawa, Takashi
Wolfgring, Erik
author_sort Petrizzo, Maria Rose
collection PubMed
description Oceanic Anoxic Event 2, spanning the Cenomanian/Turonian boundary (93.9 Ma), was an episode of major perturbations in the global carbon cycle. To investigate the response of biota and the paleoceanographic conditions across this event, we present data from International Ocean Discovery Program sites U1513 and U1516 in the Mentelle Basin (offshore SW Australia; paleolatitude 59°–60°S in the mid‐Cretaceous) that register the first complete records of OAE 2 at southern high latitudes. Calcareous nannofossils provide a reliable bio‐chronostratigraphic framework. The distribution and abundance patterns of planktonic and benthic foraminifera, radiolaria, and calcispheres permit interpretation of the dynamics of the water mass stratification and provide support for the paleobathymetric reconstruction of the two sites, with Site U1513 located northwest of the Mentelle Basin depocenter and at a deeper depth than Site U1516. The lower OAE 2 interval is characterized by reduced water mass stratification with alternating episodes of enhanced surface water productivity and variations of the thickness of the mixed layer as indicated by the fluctuations in abundance of the intermediate dwelling planktonic foraminifera. The middle OAE 2 interval contains lithologies composed almost entirely of radiolaria reflecting extremely high marine productivity; the low CaCO(3) content is consistent with marked shoaling of the Carbonate Compensation Depth and ocean acidification because of CaCO(3) undersaturation. Conditions moderated after deposition of the silica‐rich, CaCO(3)‐poor rocks as reflected by the microfossil changes indicating a relatively stable water column although episodes of enhanced eutrophy did continue into the lower Turonian at Site U1516.
format Online
Article
Text
id pubmed-9545577
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-95455772022-10-14 Biotic and Paleoceanographic Changes Across the Late Cretaceous Oceanic Anoxic Event 2 in the Southern High Latitudes (IODP Sites U1513 and U1516, SE Indian Ocean) Petrizzo, Maria Rose Amaglio, Giulia Watkins, David K. MacLeod, Kenneth G. Huber, Brian T. Hasegawa, Takashi Wolfgring, Erik Paleoceanogr Paleoclimatol Research Article Oceanic Anoxic Event 2, spanning the Cenomanian/Turonian boundary (93.9 Ma), was an episode of major perturbations in the global carbon cycle. To investigate the response of biota and the paleoceanographic conditions across this event, we present data from International Ocean Discovery Program sites U1513 and U1516 in the Mentelle Basin (offshore SW Australia; paleolatitude 59°–60°S in the mid‐Cretaceous) that register the first complete records of OAE 2 at southern high latitudes. Calcareous nannofossils provide a reliable bio‐chronostratigraphic framework. The distribution and abundance patterns of planktonic and benthic foraminifera, radiolaria, and calcispheres permit interpretation of the dynamics of the water mass stratification and provide support for the paleobathymetric reconstruction of the two sites, with Site U1513 located northwest of the Mentelle Basin depocenter and at a deeper depth than Site U1516. The lower OAE 2 interval is characterized by reduced water mass stratification with alternating episodes of enhanced surface water productivity and variations of the thickness of the mixed layer as indicated by the fluctuations in abundance of the intermediate dwelling planktonic foraminifera. The middle OAE 2 interval contains lithologies composed almost entirely of radiolaria reflecting extremely high marine productivity; the low CaCO(3) content is consistent with marked shoaling of the Carbonate Compensation Depth and ocean acidification because of CaCO(3) undersaturation. Conditions moderated after deposition of the silica‐rich, CaCO(3)‐poor rocks as reflected by the microfossil changes indicating a relatively stable water column although episodes of enhanced eutrophy did continue into the lower Turonian at Site U1516. John Wiley and Sons Inc. 2022-09-08 2022-09 /pmc/articles/PMC9545577/ /pubmed/36247808 http://dx.doi.org/10.1029/2022PA004474 Text en © 2022. The Authors. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Petrizzo, Maria Rose
Amaglio, Giulia
Watkins, David K.
MacLeod, Kenneth G.
Huber, Brian T.
Hasegawa, Takashi
Wolfgring, Erik
Biotic and Paleoceanographic Changes Across the Late Cretaceous Oceanic Anoxic Event 2 in the Southern High Latitudes (IODP Sites U1513 and U1516, SE Indian Ocean)
title Biotic and Paleoceanographic Changes Across the Late Cretaceous Oceanic Anoxic Event 2 in the Southern High Latitudes (IODP Sites U1513 and U1516, SE Indian Ocean)
title_full Biotic and Paleoceanographic Changes Across the Late Cretaceous Oceanic Anoxic Event 2 in the Southern High Latitudes (IODP Sites U1513 and U1516, SE Indian Ocean)
title_fullStr Biotic and Paleoceanographic Changes Across the Late Cretaceous Oceanic Anoxic Event 2 in the Southern High Latitudes (IODP Sites U1513 and U1516, SE Indian Ocean)
title_full_unstemmed Biotic and Paleoceanographic Changes Across the Late Cretaceous Oceanic Anoxic Event 2 in the Southern High Latitudes (IODP Sites U1513 and U1516, SE Indian Ocean)
title_short Biotic and Paleoceanographic Changes Across the Late Cretaceous Oceanic Anoxic Event 2 in the Southern High Latitudes (IODP Sites U1513 and U1516, SE Indian Ocean)
title_sort biotic and paleoceanographic changes across the late cretaceous oceanic anoxic event 2 in the southern high latitudes (iodp sites u1513 and u1516, se indian ocean)
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9545577/
https://www.ncbi.nlm.nih.gov/pubmed/36247808
http://dx.doi.org/10.1029/2022PA004474
work_keys_str_mv AT petrizzomariarose bioticandpaleoceanographicchangesacrossthelatecretaceousoceanicanoxicevent2inthesouthernhighlatitudesiodpsitesu1513andu1516seindianocean
AT amagliogiulia bioticandpaleoceanographicchangesacrossthelatecretaceousoceanicanoxicevent2inthesouthernhighlatitudesiodpsitesu1513andu1516seindianocean
AT watkinsdavidk bioticandpaleoceanographicchangesacrossthelatecretaceousoceanicanoxicevent2inthesouthernhighlatitudesiodpsitesu1513andu1516seindianocean
AT macleodkennethg bioticandpaleoceanographicchangesacrossthelatecretaceousoceanicanoxicevent2inthesouthernhighlatitudesiodpsitesu1513andu1516seindianocean
AT huberbriant bioticandpaleoceanographicchangesacrossthelatecretaceousoceanicanoxicevent2inthesouthernhighlatitudesiodpsitesu1513andu1516seindianocean
AT hasegawatakashi bioticandpaleoceanographicchangesacrossthelatecretaceousoceanicanoxicevent2inthesouthernhighlatitudesiodpsitesu1513andu1516seindianocean
AT wolfgringerik bioticandpaleoceanographicchangesacrossthelatecretaceousoceanicanoxicevent2inthesouthernhighlatitudesiodpsitesu1513andu1516seindianocean