Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a)
International audience Large igneous province (LIP) volcanism has been proposed as a key trigger of several major climate and environmental perturbations during the Phanerozoic Aeon. Large-scale carbon emissions associated with one or both of magmatic degassing from the Greater Ontong-Java Plateau (...
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-03466315 https://doi.org/10.1016/j.gloplacha.2021.103461 |
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ftunivnantes:oai:HAL:insu-03466315v1 2023-05-15T14:52:26+02:00 Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a) Percival, L.M.E. Tedeschi, L.R. Creaser, R.A. Bottini, C. Erba, E. Giraud, F. Svensen, H. Savian, J. Trindade, R. Coccioni, R. Frontalini, F. Jovane, L. Mather, T.A. Jenkyns, H.C. Institut des Sciences de la Terre (ISTerre) Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA) 2021-05 https://hal-insu.archives-ouvertes.fr/insu-03466315 https://doi.org/10.1016/j.gloplacha.2021.103461 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gloplacha.2021.103461 insu-03466315 https://hal-insu.archives-ouvertes.fr/insu-03466315 doi:10.1016/j.gloplacha.2021.103461 ISSN: 0921-8181 Global and Planetary Change https://hal-insu.archives-ouvertes.fr/insu-03466315 Global and Planetary Change, Elsevier, 2021, 200, pp.103461. ⟨10.1016/j.gloplacha.2021.103461⟩ Early Aptian Oceanic Anoxic Event (OAE 1a) Mercury Osmium isotopes Greater Ontong-Java Plateau High Arctic Large Igneous Province Submarine LIP volcanism [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2021 ftunivnantes https://doi.org/10.1016/j.gloplacha.2021.103461 2022-06-29T00:50:58Z International audience Large igneous province (LIP) volcanism has been proposed as a key trigger of several major climate and environmental perturbations during the Phanerozoic Aeon. Large-scale carbon emissions associated with one or both of magmatic degassing from the Greater Ontong-Java Plateau (G-OJP) and intrusion of organic-rich sediments by High Arctic LIP (HALIP) sills have been widely suggested as the trigger of the Early Aptian Oceanic Anoxic Event (OAE 1a: ~120 Ma). However, the respective roles of the two LIPs and associated carbon sources in causing this crisis remain debated. Here, six records of OAE 1a from the Pacific, Tethyan, Arctic, and South Atlantic realms are investigated, combining mercury (Hg) concentrations and osmium- (Os-) isotope ratios as proxies of LIP activity. Together with previously published datasets, the results indicate globally consistent Os-isotope evidence for LIP activity during OAE 1a, but geographically variable stratigraphic Hg trends. Clear mercury enrichments that match Os-isotope evidence of LIP activity, and suggest a Hg-cycle perturbation during the onset of OAE 1a, are documented at one Pacific site extremely proximal to the G-OJP, but not in Arctic, Tethyan or Atlantic records. This pattern highlights significant G-OJP volcanism during the onset of OAE 1a, and re-emphasises the limited potential for submarine LIP eruptions to cause Hg-cycle perturbations except in areas very proximal to source. The absence of clear Hg peaks in basal OAE 1a strata from the Arctic (or anywhere outside of the Pacific) does not support intense HALIP activity at that time, suggesting that the G-OJP was the more volcanically active LIP when OAE 1a commenced. Thus, G-OJP emissions of mantle carbon were more likely to have played a major role in initiating OAE 1a than thermogenic volatiles associated with the HALIP. A transient pulse of HALIP-related subaerial eruptions and/or thermogenic volatile emissions during the early–middle part of OAE 1a, potentially evidenced by more ... Article in Journal/Newspaper Arctic Université de Nantes: HAL-UNIV-NANTES Arctic Pacific Global and Planetary Change 200 103461 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Early Aptian Oceanic Anoxic Event (OAE 1a) Mercury Osmium isotopes Greater Ontong-Java Plateau High Arctic Large Igneous Province Submarine LIP volcanism [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Early Aptian Oceanic Anoxic Event (OAE 1a) Mercury Osmium isotopes Greater Ontong-Java Plateau High Arctic Large Igneous Province Submarine LIP volcanism [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Percival, L.M.E. Tedeschi, L.R. Creaser, R.A. Bottini, C. Erba, E. Giraud, F. Svensen, H. Savian, J. Trindade, R. Coccioni, R. Frontalini, F. Jovane, L. Mather, T.A. Jenkyns, H.C. Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a) |
topic_facet |
Early Aptian Oceanic Anoxic Event (OAE 1a) Mercury Osmium isotopes Greater Ontong-Java Plateau High Arctic Large Igneous Province Submarine LIP volcanism [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Large igneous province (LIP) volcanism has been proposed as a key trigger of several major climate and environmental perturbations during the Phanerozoic Aeon. Large-scale carbon emissions associated with one or both of magmatic degassing from the Greater Ontong-Java Plateau (G-OJP) and intrusion of organic-rich sediments by High Arctic LIP (HALIP) sills have been widely suggested as the trigger of the Early Aptian Oceanic Anoxic Event (OAE 1a: ~120 Ma). However, the respective roles of the two LIPs and associated carbon sources in causing this crisis remain debated. Here, six records of OAE 1a from the Pacific, Tethyan, Arctic, and South Atlantic realms are investigated, combining mercury (Hg) concentrations and osmium- (Os-) isotope ratios as proxies of LIP activity. Together with previously published datasets, the results indicate globally consistent Os-isotope evidence for LIP activity during OAE 1a, but geographically variable stratigraphic Hg trends. Clear mercury enrichments that match Os-isotope evidence of LIP activity, and suggest a Hg-cycle perturbation during the onset of OAE 1a, are documented at one Pacific site extremely proximal to the G-OJP, but not in Arctic, Tethyan or Atlantic records. This pattern highlights significant G-OJP volcanism during the onset of OAE 1a, and re-emphasises the limited potential for submarine LIP eruptions to cause Hg-cycle perturbations except in areas very proximal to source. The absence of clear Hg peaks in basal OAE 1a strata from the Arctic (or anywhere outside of the Pacific) does not support intense HALIP activity at that time, suggesting that the G-OJP was the more volcanically active LIP when OAE 1a commenced. Thus, G-OJP emissions of mantle carbon were more likely to have played a major role in initiating OAE 1a than thermogenic volatiles associated with the HALIP. A transient pulse of HALIP-related subaerial eruptions and/or thermogenic volatile emissions during the early–middle part of OAE 1a, potentially evidenced by more ... |
author2 |
Institut des Sciences de la Terre (ISTerre) Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA) |
format |
Article in Journal/Newspaper |
author |
Percival, L.M.E. Tedeschi, L.R. Creaser, R.A. Bottini, C. Erba, E. Giraud, F. Svensen, H. Savian, J. Trindade, R. Coccioni, R. Frontalini, F. Jovane, L. Mather, T.A. Jenkyns, H.C. |
author_facet |
Percival, L.M.E. Tedeschi, L.R. Creaser, R.A. Bottini, C. Erba, E. Giraud, F. Svensen, H. Savian, J. Trindade, R. Coccioni, R. Frontalini, F. Jovane, L. Mather, T.A. Jenkyns, H.C. |
author_sort |
Percival, L.M.E. |
title |
Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a) |
title_short |
Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a) |
title_full |
Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a) |
title_fullStr |
Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a) |
title_full_unstemmed |
Determining the style and provenance of magmatic activity during the Early Aptian Oceanic Anoxic Event (OAE 1a) |
title_sort |
determining the style and provenance of magmatic activity during the early aptian oceanic anoxic event (oae 1a) |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03466315 https://doi.org/10.1016/j.gloplacha.2021.103461 |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
ISSN: 0921-8181 Global and Planetary Change https://hal-insu.archives-ouvertes.fr/insu-03466315 Global and Planetary Change, Elsevier, 2021, 200, pp.103461. ⟨10.1016/j.gloplacha.2021.103461⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gloplacha.2021.103461 insu-03466315 https://hal-insu.archives-ouvertes.fr/insu-03466315 doi:10.1016/j.gloplacha.2021.103461 |
op_doi |
https://doi.org/10.1016/j.gloplacha.2021.103461 |
container_title |
Global and Planetary Change |
container_volume |
200 |
container_start_page |
103461 |
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