Carbon isotopic evidence for biomass burning at the K-T boundary

Linda C Ivany, R. J. Salawitch

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

A new interpretation of existing carbon isotopic data combined with results from a biogeochemical model suggests that burning of terrestrial biomass occurred on a global scale at the Cretaceous-Tertiary (K-T) boundary. Carbon isotopic ratios from planktonic and benthic microfossils across the K-T boundary reveal not only a breakdown in the normal surface-water to deep-water gradient of 13C/12C, but also a reversal at the boundary. This reversal cannot be explained by the cessation of primary production alone. It is proposed that combustion of terrestrial biomass with subsequent transfer of isotopically light carbon to surface waters is the most likely cause of this anomaly. A biogeochemical model is used to quantify the extent of burning at the boundary: combustion of roughly 25% of the above-ground biomass at the end of the Cretaceous is necessary to account for the observed isotopic signal. -Authors

Original languageEnglish (US)
Pages (from-to)487-490
Number of pages4
JournalGeology
Volume21
Issue number6
DOIs
StatePublished - 1993
Externally publishedYes

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biomass burning
carbon
combustion
surface water
biomass
aboveground biomass
microfossil
isotopic ratio
primary production
deep water
Cretaceous
anomaly

ASJC Scopus subject areas

  • Geology

Cite this

Carbon isotopic evidence for biomass burning at the K-T boundary. / Ivany, Linda C; Salawitch, R. J.

In: Geology, Vol. 21, No. 6, 1993, p. 487-490.

Research output: Contribution to journalArticle

Ivany, Linda C ; Salawitch, R. J. / Carbon isotopic evidence for biomass burning at the K-T boundary. In: Geology. 1993 ; Vol. 21, No. 6. pp. 487-490.
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