A major sea-level drop briefly precedes the Toarcian oceanic anoxic event: implication for Early Jurassic climate and carbon cycle

Abstract Sea-level change is an important parameter controlling the expansion of oxygen-depleted conditions in neritic settings during oceanic anoxic events (OAEs). Despite this fundamental role, it remains on a short timescale (<1 Myr) one of the least constrained parameters for numerous OAEs. H...

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Autores principales:	François-Nicolas Krencker, Sofie Lindström, Stéphane Bodin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0a2c7fc4bc6f423b997cd7fe38189653
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spelling	oai:doaj.org-article:0a2c7fc4bc6f423b997cd7fe381896532021-12-02T15:09:14ZA major sea-level drop briefly precedes the Toarcian oceanic anoxic event: implication for Early Jurassic climate and carbon cycle10.1038/s41598-019-48956-x2045-2322https://doaj.org/article/0a2c7fc4bc6f423b997cd7fe381896532019-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-48956-xhttps://doaj.org/toc/2045-2322Abstract Sea-level change is an important parameter controlling the expansion of oxygen-depleted conditions in neritic settings during oceanic anoxic events (OAEs). Despite this fundamental role, it remains on a short timescale (<1 Myr) one of the least constrained parameters for numerous OAEs. Here we present sedimentological and geochemical evidence from Morocco and East Greenland showing that a forced regression shortly precedes (ca.102 kyr) the major transgression associated with the Toarcian OAE. The forced regression can be correlated over distances greater than 3000 km in numerous Tethyan and Boreal basins, indicating that the relative sea-level change was driven by eustastic fluctuations. The major amplitude (>50 m) and short duration of the forced regression suggests that it was most likely related to the transient waxing and waning of polar ice sheet. We suggest that this short-lived glaciation might have a genetic link with the inception of the Toarcian OAE. Indeed, during the deglaciation and the accompanying sea-level rise, the thawing permafrost may have released important quantities of methane into the atmosphere that would have contributed to the Toarcian OAE rapid warming and its characteristic negative carbon isotope excursion. This study offers a hypothesis on how some hyperthermal events might be rooted in short-lived “cold-snap” episodes.François-Nicolas KrenckerSofie LindströmStéphane BodinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-12 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q François-Nicolas Krencker Sofie Lindström Stéphane Bodin A major sea-level drop briefly precedes the Toarcian oceanic anoxic event: implication for Early Jurassic climate and carbon cycle
description	Abstract Sea-level change is an important parameter controlling the expansion of oxygen-depleted conditions in neritic settings during oceanic anoxic events (OAEs). Despite this fundamental role, it remains on a short timescale (<1 Myr) one of the least constrained parameters for numerous OAEs. Here we present sedimentological and geochemical evidence from Morocco and East Greenland showing that a forced regression shortly precedes (ca.102 kyr) the major transgression associated with the Toarcian OAE. The forced regression can be correlated over distances greater than 3000 km in numerous Tethyan and Boreal basins, indicating that the relative sea-level change was driven by eustastic fluctuations. The major amplitude (>50 m) and short duration of the forced regression suggests that it was most likely related to the transient waxing and waning of polar ice sheet. We suggest that this short-lived glaciation might have a genetic link with the inception of the Toarcian OAE. Indeed, during the deglaciation and the accompanying sea-level rise, the thawing permafrost may have released important quantities of methane into the atmosphere that would have contributed to the Toarcian OAE rapid warming and its characteristic negative carbon isotope excursion. This study offers a hypothesis on how some hyperthermal events might be rooted in short-lived “cold-snap” episodes.
format	article
author	François-Nicolas Krencker Sofie Lindström Stéphane Bodin
author_facet	François-Nicolas Krencker Sofie Lindström Stéphane Bodin
author_sort	François-Nicolas Krencker
title	A major sea-level drop briefly precedes the Toarcian oceanic anoxic event: implication for Early Jurassic climate and carbon cycle
title_short	A major sea-level drop briefly precedes the Toarcian oceanic anoxic event: implication for Early Jurassic climate and carbon cycle
title_full	A major sea-level drop briefly precedes the Toarcian oceanic anoxic event: implication for Early Jurassic climate and carbon cycle
title_fullStr	A major sea-level drop briefly precedes the Toarcian oceanic anoxic event: implication for Early Jurassic climate and carbon cycle
title_full_unstemmed	A major sea-level drop briefly precedes the Toarcian oceanic anoxic event: implication for Early Jurassic climate and carbon cycle
title_sort	major sea-level drop briefly precedes the toarcian oceanic anoxic event: implication for early jurassic climate and carbon cycle
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/0a2c7fc4bc6f423b997cd7fe38189653
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A major sea-level drop briefly precedes the Toarcian oceanic anoxic event: implication for Early Jurassic climate and carbon cycle

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