Oceanic Anoxic Event 2 triggered by Kerguelen volcanism.

Autor: Walker-Trivett CA; Camborne School of Mines, Department of Earth and Environmental Sciences, University of Exeter, Penryn Campus, Penryn, TR10 9FE, UK. cw725@exeter.ac.uk.; British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK. cw725@exeter.ac.uk., Kender S; Camborne School of Mines, Department of Earth and Environmental Sciences, University of Exeter, Penryn Campus, Penryn, TR10 9FE, UK. s.kender@exeter.ac.uk.; British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK. s.kender@exeter.ac.uk., Bogus KA; Camborne School of Mines, Department of Earth and Environmental Sciences, University of Exeter, Penryn Campus, Penryn, TR10 9FE, UK., Littler K; Camborne School of Mines, Department of Earth and Environmental Sciences, University of Exeter, Penryn Campus, Penryn, TR10 9FE, UK., Edvardsen T; Camborne School of Mines, Department of Earth and Environmental Sciences, University of Exeter, Penryn Campus, Penryn, TR10 9FE, UK., Leng MJ; British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK., Lacey J; British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK., Riding JB; British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK., Millar IL; British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK., Wagner D; British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Jun 15; Vol. 15 (1), pp. 5124. Date of Electronic Publication: 2024 Jun 15.
DOI: 10.1038/s41467-024-49032-3
Abstrakt: 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.
(© 2024. The Author(s).)
Databáze: MEDLINE
Externí odkaz: