Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex

Abstract Methane emissions from Arctic continental margins are increasing due to the negative effect of global warming on ice sheet and permafrost stability, but dynamics and timescales of seafloor seepage still remain poorly constrained. Here, we examine sediment cores collected from an active seep...

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Autores principales:	Claudio Argentino, Kate Alyse Waghorn, Sunil Vadakkepuliyambatta, Stéphane Polteau, Stefan Bünz, Giuliana Panieri
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5989681333e4448797d9455925790fcc
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spelling	oai:doaj.org-article:5989681333e4448797d9455925790fcc2021-12-02T16:23:14ZDynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex10.1038/s41598-021-83542-02045-2322https://doaj.org/article/5989681333e4448797d9455925790fcc2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83542-0https://doaj.org/toc/2045-2322Abstract Methane emissions from Arctic continental margins are increasing due to the negative effect of global warming on ice sheet and permafrost stability, but dynamics and timescales of seafloor seepage still remain poorly constrained. Here, we examine sediment cores collected from an active seepage area located between 295 and 353 m water depth in the SW Barents Sea, at Leirdjupet Fault Complex. The geochemical composition of hydrocarbon gas in the sediment indicates a mixture of microbial and thermogenic gas, the latter being sourced from underlying Mesozoic formations. Sediment and carbonate geochemistry reveal a long history of methane emissions that started during Late Weichselian deglaciation after 14.5 cal ka BP. Methane-derived authigenic carbonates precipitated due to local gas hydrate destabilization, in turn triggered by an increasing influx of warm Atlantic water and isostatic rebound linked to the retreat of the Barents Sea Ice Sheet. This study has implications for a better understanding of the dynamic and future evolution of methane seeps in modern analogue systems in Western Antarctica, where the retreat of marine-based ice sheet induced by global warming may cause the release of large amounts of methane from hydrocarbon reservoirs and gas hydrates.Claudio ArgentinoKate Alyse WaghornSunil VadakkepuliyambattaStéphane PolteauStefan BünzGiuliana PanieriNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Claudio Argentino Kate Alyse Waghorn Sunil Vadakkepuliyambatta Stéphane Polteau Stefan Bünz Giuliana Panieri Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex
description	Abstract Methane emissions from Arctic continental margins are increasing due to the negative effect of global warming on ice sheet and permafrost stability, but dynamics and timescales of seafloor seepage still remain poorly constrained. Here, we examine sediment cores collected from an active seepage area located between 295 and 353 m water depth in the SW Barents Sea, at Leirdjupet Fault Complex. The geochemical composition of hydrocarbon gas in the sediment indicates a mixture of microbial and thermogenic gas, the latter being sourced from underlying Mesozoic formations. Sediment and carbonate geochemistry reveal a long history of methane emissions that started during Late Weichselian deglaciation after 14.5 cal ka BP. Methane-derived authigenic carbonates precipitated due to local gas hydrate destabilization, in turn triggered by an increasing influx of warm Atlantic water and isostatic rebound linked to the retreat of the Barents Sea Ice Sheet. This study has implications for a better understanding of the dynamic and future evolution of methane seeps in modern analogue systems in Western Antarctica, where the retreat of marine-based ice sheet induced by global warming may cause the release of large amounts of methane from hydrocarbon reservoirs and gas hydrates.
format	article
author	Claudio Argentino Kate Alyse Waghorn Sunil Vadakkepuliyambatta Stéphane Polteau Stefan Bünz Giuliana Panieri
author_facet	Claudio Argentino Kate Alyse Waghorn Sunil Vadakkepuliyambatta Stéphane Polteau Stefan Bünz Giuliana Panieri
author_sort	Claudio Argentino
title	Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex
title_short	Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex
title_full	Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex
title_fullStr	Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex
title_full_unstemmed	Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex
title_sort	dynamic and history of methane seepage in the sw barents sea: new insights from leirdjupet fault complex
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/5989681333e4448797d9455925790fcc
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Dynamic and history of methane seepage in the SW Barents Sea: new insights from Leirdjupet Fault Complex

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