Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event
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 f...
Main Authors: | , , , , , , , , , , |
---|---|
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2022
|
Subjects: | |
Online Access: | https://dspace.library.uu.nl/handle/1874/420432 |
id |
ftunivutrecht:oai:dspace.library.uu.nl:1874/420432 |
---|---|
record_format |
openpolar |
spelling |
ftunivutrecht:oai:dspace.library.uu.nl:1874/420432 2023-11-12T04:20:57+01:00 Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event Font, Eric Duarte, Luís Vítor Dekkers, Mark J. Remazeilles, Celine Egli, Ramon Spangenberg, Jorge E. Fantasia, Alicia Ribeiro, Joana Gomes, Elsa Mirão, José Adatte, Thierry Paleomagnetism 2022-03-14 application/pdf https://dspace.library.uu.nl/handle/1874/420432 en eng 2045-2322 https://dspace.library.uu.nl/handle/1874/420432 info:eu-repo/semantics/OpenAccess Atmosphere Carbon Isotopes/analysis Geologic Sediments Mercury Methane Oceans and Seas General Article 2022 ftunivutrecht 2023-11-01T23:28:26Z 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 Utrecht University Repository |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Atmosphere Carbon Isotopes/analysis Geologic Sediments Mercury Methane Oceans and Seas General |
spellingShingle |
Atmosphere Carbon Isotopes/analysis Geologic Sediments Mercury Methane Oceans and Seas General Font, Eric Duarte, Luís Vítor Dekkers, Mark J. Remazeilles, Celine Egli, Ramon Spangenberg, Jorge E. Fantasia, Alicia Ribeiro, Joana Gomes, Elsa Mirão, José Adatte, Thierry Rapid light carbon releases and increased aridity linked to Karoo–Ferrar magmatism during the early Toarcian oceanic anoxic event |
topic_facet |
Atmosphere Carbon Isotopes/analysis Geologic Sediments Mercury Methane Oceans and Seas General |
description |
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. |
author2 |
Paleomagnetism |
format |
Article in Journal/Newspaper |
author |
Font, Eric Duarte, Luís Vítor Dekkers, Mark J. Remazeilles, Celine Egli, Ramon Spangenberg, Jorge E. Fantasia, Alicia Ribeiro, Joana Gomes, Elsa Mirão, José Adatte, Thierry |
author_facet |
Font, Eric Duarte, Luís Vítor Dekkers, Mark J. Remazeilles, Celine Egli, Ramon Spangenberg, Jorge E. Fantasia, Alicia Ribeiro, Joana Gomes, Elsa Mirão, José Adatte, Thierry |
author_sort |
Font, Eric |
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 |
publishDate |
2022 |
url |
https://dspace.library.uu.nl/handle/1874/420432 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
2045-2322 https://dspace.library.uu.nl/handle/1874/420432 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782336633849249792 |