A.D.C. Du Vivier
Marine 187Os/188Os isotope stratigraphy reveals the interaction of volcanism and ocean circulation during Oceanic Anoxic Event 2
Du Vivier, A.D.C.; Selby, D.; Sageman, B.B; Jarvis, I.; Gröcke, D.R.; Voigt, S.
Professor Darren Grocke firstname.lastname@example.org
High-resolution osmium (Os) isotope stratigraphy across the Cenomanian–Turonian Boundary Interval from 6 sections for four transcontinental settings has produced a record of seawater chemistry that demonstrates regional variability as a function of terrestrial and hydrothermal inputs, revealing the impact of palaeoenvironmental processes. In every section the 187Os/188Os profiles show a comparable trend; radiogenic values in the lead up to Oceanic Anoxic Event 2 (OAE 2); an abrupt unradiogenic trend at the onset of OAE 2; an unradiogenic interval during the first part of OAE 2; and a return to radiogenic values towards the end of the event, above the Cenomanian–Turonian boundary. The unradiogenic trend in 187Os/188Os is synchronous in all sections. Previous work suggests that activity of the Caribbean LIP (Large Igneous Province) was the source of unradiogenic Os across the OAE 2 and possibly an instigator of anoxia in the oceans. Here we assess this hypothesis and consider the influence of activity from other LIPs; such as the High Arctic LIP. A brief shift to high radiogenic 187Os/188Os values occurred in the Western Interior Seaway before the onset of OAE 2. We evaluate this trend and suggest that a combination of factors collectively played critical roles in the initiation of OAE 2; differential input of nutrients from continental and volcanogenic sources, coupled with efficient palaeocirculation of the global ocean and epeiric seas, enhanced productivity due to higher nutrient availability, which permitted penecontemporaneous transport of continental and LIP-derived nutrients to trans-equatorial basins.
Du Vivier, A., Selby, D., Sageman, B., Jarvis, I., Gröcke, D., & Voigt, S. (2014). Marine 187Os/188Os isotope stratigraphy reveals the interaction of volcanism and ocean circulation during Oceanic Anoxic Event 2. Earth and Planetary Science Letters, 389(1), 23-33. https://doi.org/10.1016/j.epsl.2013.12.024
|Journal Article Type||Article|
|Acceptance Date||Dec 17, 2013|
|Online Publication Date||Jan 6, 2014|
|Publication Date||Mar 1, 2014|
|Deposit Date||Dec 20, 2013|
|Publicly Available Date||Feb 17, 2014|
|Journal||Earth and Planetary Science Letters|
|Peer Reviewed||Peer Reviewed|
|Keywords||OAE 2, 187Os/188Os isotope composition, Palaeocirculation, Global warming, Caribbean LIP, Carbon.|
Published Journal Article
Publisher Licence URL
© 2013 The Authors. Published by Elsevier B.V. This is an open access article under the CC-BY license (http://creativecommons.org/licenses/by/3.0/).