Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event
Abstract Large-scale release of isotopically light carbon is responsible for the carbon isotope excursion (CIE) of the Toarcian Oceanic Anoxic Event during the Lower Jurassic. Proposed sources include methane hydrate dissociation, volcanogenic outgassing of carbon dioxide and/or thermogenic methane...
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ftdoajarticles:oai:doaj.org/article:ea2be7db5752460291e2a0f254afcc76 2023-05-15T17:12:01+02:00 Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event Eric Font Luís Vítor Duarte Mark J. Dekkers Celine Remazeilles Ramon Egli Jorge E. Spangenberg Alicia Fantasia Joana Ribeiro Elsa Gomes José Mirão Thierry Adatte 2022-03-01T00:00:00Z https://doi.org/10.1038/s41598-022-08269-y https://doaj.org/article/ea2be7db5752460291e2a0f254afcc76 EN eng Nature Portfolio https://doi.org/10.1038/s41598-022-08269-y https://doaj.org/toc/2045-2322 doi:10.1038/s41598-022-08269-y 2045-2322 https://doaj.org/article/ea2be7db5752460291e2a0f254afcc76 Scientific Reports, Vol 12, Iss 1, Pp 1-13 (2022) Medicine R Science Q article 2022 ftdoajarticles https://doi.org/10.1038/s41598-022-08269-y 2022-12-31T04:01:20Z Abstract Large-scale release of isotopically light carbon is responsible for the carbon isotope excursion (CIE) of the Toarcian Oceanic Anoxic Event during the Lower Jurassic. Proposed sources include methane hydrate dissociation, volcanogenic outgassing of carbon dioxide and/or thermogenic methane release from the Karoo‐Ferrar magmatic province (southern Africa). Distinct small-scale shifts superimposed on the long-term CIE have been interpreted as rapid methane pulses linked to astronomically forced climate changes. In the Peniche reference section (Portugal), these small-scale shifts correspond to distinct brownish marly layers featuring markedly high mercury (Hg) and magnetic mineral concentration. Total organic carbon and Hg increase are uncorrelated, which suggests input of Hg into the atmosphere, possibly released after the intrusion of the Karoo-Ferrar sills into organic-rich sediments. Enhanced magnetic properties are associated with the presence of martite, washed-in oxidized magnetite, inferred to be due to increased aridity on the continental hinterland. This study provides strong evidence for a direct link between the Karoo-Ferrar magmatism, the carbon-isotope shifts and the resulting environmental changes. Article in Journal/Newspaper Methane hydrate Directory of Open Access Journals: DOAJ Articles Scientific Reports 12 1 |
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Medicine R Science Q Eric Font Luís Vítor Duarte Mark J. Dekkers Celine Remazeilles Ramon Egli Jorge E. Spangenberg Alicia Fantasia Joana Ribeiro Elsa Gomes José Mirão Thierry Adatte Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event |
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Medicine R Science Q |
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Abstract Large-scale release of isotopically light carbon is responsible for the carbon isotope excursion (CIE) of the Toarcian Oceanic Anoxic Event during the Lower Jurassic. Proposed sources include methane hydrate dissociation, volcanogenic outgassing of carbon dioxide and/or thermogenic methane release from the Karoo‐Ferrar magmatic province (southern Africa). Distinct small-scale shifts superimposed on the long-term CIE have been interpreted as rapid methane pulses linked to astronomically forced climate changes. In the Peniche reference section (Portugal), these small-scale shifts correspond to distinct brownish marly layers featuring markedly high mercury (Hg) and magnetic mineral concentration. Total organic carbon and Hg increase are uncorrelated, which suggests input of Hg into the atmosphere, possibly released after the intrusion of the Karoo-Ferrar sills into organic-rich sediments. Enhanced magnetic properties are associated with the presence of martite, washed-in oxidized magnetite, inferred to be due to increased aridity on the continental hinterland. This study provides strong evidence for a direct link between the Karoo-Ferrar magmatism, the carbon-isotope shifts and the resulting environmental changes. |
format |
Article in Journal/Newspaper |
author |
Eric Font Luís Vítor Duarte Mark J. Dekkers Celine Remazeilles Ramon Egli Jorge E. Spangenberg Alicia Fantasia Joana Ribeiro Elsa Gomes José Mirão Thierry Adatte |
author_facet |
Eric Font Luís Vítor Duarte Mark J. Dekkers Celine Remazeilles Ramon Egli Jorge E. Spangenberg Alicia Fantasia Joana Ribeiro Elsa Gomes José Mirão Thierry Adatte |
author_sort |
Eric Font |
title |
Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event |
title_short |
Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event |
title_full |
Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event |
title_fullStr |
Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event |
title_full_unstemmed |
Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event |
title_sort |
rapid light carbon releases and increased aridity linked to karoo–ferrar magmatism during the early toarcian oceanic anoxic event |
publisher |
Nature Portfolio |
publishDate |
2022 |
url |
https://doi.org/10.1038/s41598-022-08269-y https://doaj.org/article/ea2be7db5752460291e2a0f254afcc76 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Scientific Reports, Vol 12, Iss 1, Pp 1-13 (2022) |
op_relation |
https://doi.org/10.1038/s41598-022-08269-y https://doaj.org/toc/2045-2322 doi:10.1038/s41598-022-08269-y 2045-2322 https://doaj.org/article/ea2be7db5752460291e2a0f254afcc76 |
op_doi |
https://doi.org/10.1038/s41598-022-08269-y |
container_title |
Scientific Reports |
container_volume |
12 |
container_issue |
1 |
_version_ |
1766068769991426048 |