Oceanic Anoxic Event 2 triggered by Kerguelen volcanism

This is the final version. Available from Nature Research via the DOI in this record. Data availability: The data generated in this study have been deposited in “figshare” under https://doi.org/10.6084/m9.figshare.25106123. Data generated in this study are also provided in Excel workbooks called Sup...

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Bibliographic Details
Main Authors: Walker-Trivett, CA, Kender, S, Bogus, KA, Littler, K, Edvardsen, T, Leng, MJ, Lacey, J, Riding, JB, Millar, IL, Wagner, D
Format: Article in Journal/Newspaper
Language:English
Published: Nature Research 2024
Subjects:
Carbon cycle
Element cycles
Palaeoceanography
Palaeoclimate
Arctic
Cornwall
Kerguelen
Foraminifera*
Global warming
Online Access:http://hdl.handle.net/10871/136302
https://doi.org/10.1038/s41467-024-49032-3
Description
Summary:This is the final version. Available from Nature Research via the DOI in this record. Data availability: The data generated in this study have been deposited in “figshare” under https://doi.org/10.6084/m9.figshare.25106123. Data generated in this study are also provided in Excel workbooks called Supplementary Data 1, 2, and 3. Benthic foraminifera are curated at the Camborne School of Mines, University of Exeter, Penryn Campus, Cornwall TR10 9EZ Large Igneous Provinces (LIPs) are associated with global warming and carbon cycle perturbations during Oceanic Anoxic Event 2 (OAE2, ~94 Ma) and the Mid-Cenomanian Event (MCE, ~96.5 Ma). However, there is still no consensus on the role volcanism played as a trigger, or its source – previously ascribed to the Caribbean LIP or High Arctic LIP. Here, we use Mentelle Basin sedimentary mercury (Hg) concentrations to determine the timing of volcanism, and neodymium (Nd) and strontium (Sr) isotopes for sedimentary provenance. High Hg concentrations compared to Northern Hemisphere records, and a shift to radiogenic Nd isotopes, indicates Kerguelen LIP volcanic activity and plateau uplift occurred in the lead up to and within OAE2. Whilst we find limited evidence that a volcanic event caused the MCE, pulsed Hg spikes before and during OAE2 imply volcanic emissions were key in driving climate and carbon cycle changes and triggering OAE2. Natural Environment Research Council (NERC) Natural Environment Research Council (NERC)

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