The rhythmic expression of mid-Cretaceous Oceanic Anoxic Event 2 southwest of Australia (IODP U1513, U1516)
International audience The widespread deposition of organic-rich black shales during the mid-Cretaceous hothouse at ~94 Mamarked a climatic extreme that is particularly well studied in the Northern Hemisphere. The expression ofOceanic Anoxic Event 2 (OAE 2) in the NH was characterised by low oceanic...
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ftccsdartic:oai:HAL:insu-03373400v1 2023-05-15T17:32:02+02:00 The rhythmic expression of mid-Cretaceous Oceanic Anoxic Event 2 southwest of Australia (IODP U1513, U1516) Batenburg, Sietske J. Bogus, Kara Jones, Matthew, G. Macleod, Kenneth Martinez, Mathieu Géosciences Rennes (GR) Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES) University of Exeter University of Michigan Ann Arbor University of Michigan System University of Missouri Columbia (Mizzou) University of Missouri System Virtual, Czech Republic 2021-06-21 https://hal-insu.archives-ouvertes.fr/insu-03373400 en eng HAL CCSD insu-03373400 https://hal-insu.archives-ouvertes.fr/insu-03373400 35th IAS Meeting of Sedimentology https://hal-insu.archives-ouvertes.fr/insu-03373400 35th IAS Meeting of Sedimentology, Jun 2021, Virtual, Czech Republic. pp.45 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDE]Environmental Sciences info:eu-repo/semantics/conferenceObject Conference papers 2021 ftccsdartic 2022-01-09T00:05:29Z International audience The widespread deposition of organic-rich black shales during the mid-Cretaceous hothouse at ~94 Mamarked a climatic extreme that is particularly well studied in the Northern Hemisphere. The expression ofOceanic Anoxic Event 2 (OAE 2) in the NH was characterised by low oceanic oxygen concentrations, likelycaused by the input of nutrients through volcanism and/or weathering in combination with a peculiar geographyin which the proto-North Atlantic was semi-restricted (Jenkyns, 2010; Trabucho Alexandre et al.,2010). The extent of water column anoxia outside the North Atlantic and Tethyan domains remains poorlyresolved, as few Southern Hemisphere records have been recovered that span OAE 2, and only a portion ofthose Indian and Pacific Ocean localities experienced anoxia and organic matter deposition (Dickson et al.,2017; Hasegawa et al., 2013).Here we present new results from IODP Expedition 369 offshore southwestern Australia. Sedimentary recordsacross the Cenomanian-Turonian transition from Sites U1513 and U1516 in the Mentelle Basin (Indian Ocean)display rhythmic lithologic banding patterns. The OAE 2 interval is marked by a dramatic drop in carbonatecontent and the occurrence of several thin organic-rich black bands. The spacing of dark bands within arhythmic sequence suggests a potential orbital control on organic matter deposition at our study sites. Timeseries analyses of high-resolution (cm-scale) elemental data from XRF-core scanning reveal the imprint ofperiodicities that can be confidently linked to Earth’s orbital parameters. The new OAE 2 records from SitesU1516 and U1513 allow us to i) evaluate existing time scales over the Cenomanian-Turonian transition, andii) investigate the mechanisms leading to a recurrent lack of oxygen in the Indian Ocean.Climatic mechanisms translating changes in insolation to variations in organic matter deposition may haveincluded variations in nutrient input from nearby continents and shifts in water column structure affectinglocal to regional ... Conference Object North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Indian Pacific |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDE]Environmental Sciences |
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[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDE]Environmental Sciences Batenburg, Sietske J. Bogus, Kara Jones, Matthew, G. Macleod, Kenneth Martinez, Mathieu The rhythmic expression of mid-Cretaceous Oceanic Anoxic Event 2 southwest of Australia (IODP U1513, U1516) |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDE]Environmental Sciences |
description |
International audience The widespread deposition of organic-rich black shales during the mid-Cretaceous hothouse at ~94 Mamarked a climatic extreme that is particularly well studied in the Northern Hemisphere. The expression ofOceanic Anoxic Event 2 (OAE 2) in the NH was characterised by low oceanic oxygen concentrations, likelycaused by the input of nutrients through volcanism and/or weathering in combination with a peculiar geographyin which the proto-North Atlantic was semi-restricted (Jenkyns, 2010; Trabucho Alexandre et al.,2010). The extent of water column anoxia outside the North Atlantic and Tethyan domains remains poorlyresolved, as few Southern Hemisphere records have been recovered that span OAE 2, and only a portion ofthose Indian and Pacific Ocean localities experienced anoxia and organic matter deposition (Dickson et al.,2017; Hasegawa et al., 2013).Here we present new results from IODP Expedition 369 offshore southwestern Australia. Sedimentary recordsacross the Cenomanian-Turonian transition from Sites U1513 and U1516 in the Mentelle Basin (Indian Ocean)display rhythmic lithologic banding patterns. The OAE 2 interval is marked by a dramatic drop in carbonatecontent and the occurrence of several thin organic-rich black bands. The spacing of dark bands within arhythmic sequence suggests a potential orbital control on organic matter deposition at our study sites. Timeseries analyses of high-resolution (cm-scale) elemental data from XRF-core scanning reveal the imprint ofperiodicities that can be confidently linked to Earth’s orbital parameters. The new OAE 2 records from SitesU1516 and U1513 allow us to i) evaluate existing time scales over the Cenomanian-Turonian transition, andii) investigate the mechanisms leading to a recurrent lack of oxygen in the Indian Ocean.Climatic mechanisms translating changes in insolation to variations in organic matter deposition may haveincluded variations in nutrient input from nearby continents and shifts in water column structure affectinglocal to regional ... |
author2 |
Géosciences Rennes (GR) Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES) University of Exeter University of Michigan Ann Arbor University of Michigan System University of Missouri Columbia (Mizzou) University of Missouri System |
format |
Conference Object |
author |
Batenburg, Sietske J. Bogus, Kara Jones, Matthew, G. Macleod, Kenneth Martinez, Mathieu |
author_facet |
Batenburg, Sietske J. Bogus, Kara Jones, Matthew, G. Macleod, Kenneth Martinez, Mathieu |
author_sort |
Batenburg, Sietske J. |
title |
The rhythmic expression of mid-Cretaceous Oceanic Anoxic Event 2 southwest of Australia (IODP U1513, U1516) |
title_short |
The rhythmic expression of mid-Cretaceous Oceanic Anoxic Event 2 southwest of Australia (IODP U1513, U1516) |
title_full |
The rhythmic expression of mid-Cretaceous Oceanic Anoxic Event 2 southwest of Australia (IODP U1513, U1516) |
title_fullStr |
The rhythmic expression of mid-Cretaceous Oceanic Anoxic Event 2 southwest of Australia (IODP U1513, U1516) |
title_full_unstemmed |
The rhythmic expression of mid-Cretaceous Oceanic Anoxic Event 2 southwest of Australia (IODP U1513, U1516) |
title_sort |
rhythmic expression of mid-cretaceous oceanic anoxic event 2 southwest of australia (iodp u1513, u1516) |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03373400 |
op_coverage |
Virtual, Czech Republic |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
35th IAS Meeting of Sedimentology https://hal-insu.archives-ouvertes.fr/insu-03373400 35th IAS Meeting of Sedimentology, Jun 2021, Virtual, Czech Republic. pp.45 |
op_relation |
insu-03373400 https://hal-insu.archives-ouvertes.fr/insu-03373400 |
_version_ |
1766129960193359872 |