Multi-proxy constraints on the significance of covariant δ13C values in carbonate and organic carbon during the early Mississippian

Amanda M. Oehlert, Peter K Swart, Gregor P Eberli, Samantha Evans, Tracy D. Frank

Research output: Contribution to journalArticle

Abstract

This study investigates the covariation between carbonate and organic δ13C values in a proximal to distal transect of four outcrops in the Madison Limestone in the Western United States Rockies, combined with δ34S values of carbonate associated sulphate, the concentration of acid-insoluble material and measurements of total organic carbon. These new geochemical datasets not only allow for an evaluation of carbon isotope covariance during one of the largest perturbations to the global carbon cycle over the past 550 Myr, but also constrain the cause of the excursion in carbonate δ13C values. The results support the hypothesis that a period of anoxia did not play a role in generating the positive carbonate δ13C values, but rather favour interpretations by previous workers that the proliferation of land plants destabilized the Carboniferous carbon cycle, setting the stage for a significant change in the carbonate δ13C values of contemporaneous marine carbonates. These results also demonstrate that one of the largest perturbations to the global carbon cycle did not produce synchronous variations in carbonate and organic δ13C values, emphasizing the importance of local depositional controls on carbon isotope covariance in the geological record in both modern and ancient environments.

Original languageEnglish (US)
JournalSedimentology
DOIs
StateAccepted/In press - Jan 1 2018
Externally publishedYes

Fingerprint

organic carbon
carbonate
carbon cycle
carbon isotope
perturbation
anoxia
geological record
total organic carbon
outcrop
transect
limestone
sulfate
acid

Keywords

  • Carbonate
  • carbonate associated sulphate
  • Mississippian
  • organic carbon
  • stable isotopes

ASJC Scopus subject areas

  • Geology
  • Stratigraphy

Cite this

Multi-proxy constraints on the significance of covariant δ13C values in carbonate and organic carbon during the early Mississippian. / Oehlert, Amanda M.; Swart, Peter K; Eberli, Gregor P; Evans, Samantha; Frank, Tracy D.

In: Sedimentology, 01.01.2018.

Research output: Contribution to journalArticle

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