Decoupling δ13Ccarb and δ13Corg at the onset of the Ireviken Carbon Isotope Excursion : Δ13C and organic carbon burial (forg) during a Silurian oceanic anoxic event

Emma R Hartke; Bradley D Cramer; Mikael Calner; Michael J Melchin; Bruce A Barnett; Stephan C Oborny; Alyssa M Bancroft

doi:10.1016/j.gloplacha.2020.103373

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Decoupling δ13Ccarb and δ13Corg at the onset of the Ireviken Carbon Isotope Excursion : Δ13C and organic carbon burial (forg) during a Silurian oceanic anoxic event

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Decoupling δ13Ccarb and δ13Corg at the onset of the Ireviken Carbon Isotope Excursion : Δ13C and organic carbon burial (forg) during a Silurian oceanic anoxic event

Emma R Hartke, Bradley D Cramer, Mikael Calner, Michael J Melchin, Bruce A Barnett, Stephan C Oborny and Alyssa M Bancroft

Global and planetary change, Vol.196, p.103373

2021

DOI: 10.1016/j.gloplacha.2020.103373

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Abstract

Paired records of δ13Ccarb and δ13Corg across the Llandovery-Wenlock boundary demonstrate asynchronous behavior during the onset of the Ireviken Biogeochemical Event (IBE). The extremely high-resolution data produced from the Altajme Core, drilled from Gotland, Sweden, capture a negative excursion in δ13Corg during the initiation of the Ireviken Extinction Event (IEE) and prior to the onset of the Ireviken positive δ13Ccarb Excursion (ICIE). The record of carbon isotopic changes through this interval illustrate that both Δ13C (the difference between δ13Ccarb and δ13Corg) as well as the relative flux of organic carbon burial (forg) vary in unique ways and at different times during the progression of the IBE. Both process-oriented variables within the global carbon cycle (Δ13C and forg) track a series of events that help to demonstrate potential causative mechanisms of both the extinction and carbon cycle perturbation. The sequence of events demonstrated here largely mirror the cascade of events that took place during the Cretaceous Oceanic Anoxic Event 2 (OAE2) and a detailed comparison between the two events is provided here for the first time. The unique insight into the IBE presented in this work results primarily from the novel, nearly Neogene-scale resolution of the paired isotope data, which demonstrates the critical importance of high-resolution chemostratigraphic research to evaluating ancient perturbations to the Earth-life system. Additional data sets of equal or greater resolution through this interval will be critical to evaluate the global synchroneity of these short-lived events during the IBE, and similar high-resolution studies of other Paleozoic biogeochemical events may shed light on potentially similar causative mechanisms.

Earth and Related Environmental Sciences

Geologi

Geology

Geovetenskap och miljövetenskap

Natural Sciences

Naturvetenskap

Details

Title: Subtitle: Decoupling δ13Ccarb and δ13Corg at the onset of the Ireviken Carbon Isotope Excursion : Δ13C and organic carbon burial (forg) during a Silurian oceanic anoxic event
Creators: Emma R Hartke - University of Iowa
Bradley D Cramer - University of Iowa
Mikael Calner - Lund University
Michael J Melchin - St. Francis Xavier University
Bruce A Barnett - University of Kansas
Stephan C Oborny - University of Kansas
Alyssa M Bancroft - Indiana University
Resource Type: Journal article
Publication Details: Global and planetary change, Vol.196, p.103373
DOI: 10.1016/j.gloplacha.2020.103373
ISSN: 0921-8181
eISSN: 1872-6364
Grant note: DOI: 10.13039/100000104, name: National Aeronautics and Space Administration; DOI: 10.13039/501100000038, name: Natural Sciences and Engineering Research Council of Canada; DOI: 10.13039/100000001, name: National Science Foundation
Language: English
Date published: 2021
Academic Unit: Office Of The Provost; International Programs; Earth and Environmental Sciences; IIHR--Hydroscience and Engineering
Record Identifier: 9984229303702771

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