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      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)

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          Abstract

          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.

          Key Points

          • Documentation of first complete record of the Late Cretaceous Oceanic Anoxic Event 2 (OAE 2) at southern high latitudes (60°S) in the Indian Ocean

          • Dynamics of the water mass stratification inferred from distribution patterns of foraminifera, radiolaria, calcispheres

          • OAE 2 is characterized by alternating episodes of enhanced surface water productivity and variations of the thickness of the mixed layer

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          Most cited references205

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            Geochemistry of oceanic anoxic events

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                Author and article information

                Contributors
                mrose.petrizzo@unimi.it
                Journal
                Paleoceanogr Paleoclimatol
                Paleoceanogr Paleoclimatol
                10.1002/(ISSN)2572-4525
                PALO
                Paleoceanography and Paleoclimatology
                John Wiley and Sons Inc. (Hoboken )
                2572-4517
                2572-4525
                08 September 2022
                September 2022
                : 37
                : 9 ( doiID: 10.1002/palo.v37.9 )
                : e2022PA004474
                Affiliations
                [ 1 ] Dipartimento di Scienze della Terra “A. Desio” Università degli Studi di Milano Milano Italy
                [ 2 ] Department of Earth and Atmospheric Sciences University of Nebraska Lincoln NE USA
                [ 3 ] Department of Geological Sciences University of Missouri‐Columbia Columbia MO USA
                [ 4 ] National Museum of Natural History Smithsonian Institution Washington DC USA
                [ 5 ] Faculty of Geosciences and Civil Engineering Institute of Science and Engineering Kanazawa University Kanazawa Japan
                [ 6 ] Department of Geology University of Vienna Vienna Austria
                Author notes
                [*] [* ] Correspondence to:

                M. R. Petrizzo,

                mrose.petrizzo@ 123456unimi.it

                Author information
                https://orcid.org/0000-0002-9584-8471
                https://orcid.org/0000-0003-4886-1339
                https://orcid.org/0000-0001-5739-5646
                https://orcid.org/0000-0002-6016-0837
                https://orcid.org/0000-0002-0929-3175
                https://orcid.org/0000-0003-0147-506X
                https://orcid.org/0000-0003-3457-2026
                Article
                PALO21202 2022PA004474
                10.1029/2022PA004474
                9545577
                36247808
                68aa6625-b8be-44c6-ab36-b1496491f560
                © 2022. The Authors.

                This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

                History
                : 10 August 2022
                : 30 April 2022
                : 11 August 2022
                Page count
                Figures: 10, Tables: 2, Pages: 30, Words: 18849
                Funding
                Funded by: Ministero dell’Istruzione, dell’Università e della Ricerca , doi 10.13039/501100003407;
                Award ID: PRIN 2017RX9XXY
                Funded by: CNR
                Award ID: CONTR_CNR17MPETR_01 and CONTR_CNR19MPETR_01
                Funded by: MEXT, Japan Society for the Promotion of Science , doi 10.13039/501100001691;
                Award ID: 19H02011
                Funded by: Austrian Science Fund , doi 10.13039/501100002428;
                Award ID: J‐4444B
                Funded by: United States Science Support Program , doi 10.13039/100012018;
                Categories
                Atmospheric Composition and Structure
                Air/Sea Constituent Fluxes
                Volcanic Effects
                Biogeosciences
                Paleoclimatology and Paleoceanography
                Biogeosciences
                Climate Dynamics
                Isotopic Composition and Chemistry
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                Custom metadata
                2.0
                September 2022
                Converter:WILEY_ML3GV2_TO_JATSPMC version:6.2.0 mode:remove_FC converted:07.10.2022

                oceanic anoxic event 2,stable isotopes,paleoceanography,planktonic foraminifera,calcareous nannofossils,radiolaria,calcispheres,benthic foraminifera

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