Carbon Isotope Excursion in Atmospheric CO 2 at the Cretaceous-Tertiary Boundary: Evidence from Terrestrial Sediments

Abstract

Other| August 01, 2000 Carbon Isotope Excursion in Atmospheric CO2 at the Cretaceous-Tertiary Boundary: Evidence from Terrestrial Sediments NAN CRYSTAL ARENS; NAN CRYSTAL ARENS 1Department of Integrative Biology, University of California, Berkeley, CA 94720 Search for other works by this author on: GSW Google Scholar A. HOPE JAHREN A. HOPE JAHREN 2Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218 Search for other works by this author on: GSW Google Scholar PALAIOS (2000) 15 (4): 314–322. https://doi.org/10.1669/0883-1351(2000)015<0314:CIEIAC>2.0.CO;2 Article history accepted: 02 May 2000 first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation NAN CRYSTAL ARENS, A. HOPE JAHREN; Carbon Isotope Excursion in Atmospheric CO2 at the Cretaceous-Tertiary Boundary: Evidence from Terrestrial Sediments. PALAIOS 2000;; 15 (4): 314–322. doi: https://doi.org/10.1669/0883-1351(2000)015<0314:CIEIAC>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyPALAIOS Search Advanced Search Abstract A −1.5‰ to −2‰ carbon isotope excursion immediately above the clay layer that defines the Cretaceous-Tertiary (K/T) boundary has been reported in marine sediments world wide. This paper reports a similar −1.5‰ to −2.8‰ carbon isotope excursion recorded by C3 land plants from three temporally-controlled, stratigraphically-constrained terrestrial sections in the Western Interior of North America (Garfield County, Montana, and Slope County, North Dakota). Carbon isotope measurements of bulk sedimentary organic carbon were well-correlated with those of isolated plant cuticle, suggesting that the terrestrial organic carbon signature in these sediments parallels that of plant cuticle. Carbon isotope signatures were also independent of rock type and depositional environment, showing that the carbon isotope signature of plants, although altered, is not biased taphonomically. Because the signature in terrestrial facies records the isotope composition of paleoatmospheric CO2, this record—combined with that from marine sections—offers additional insight into changes in carbon cycling underlying the K/T negative carbon isotope excursion. For example, radiometric age determinations from the Hell Creek Road locality in Montana bracket the atmospheric carbon isotopic recovery between 65.00 ± 0.05 Ma and 65.16 ± 0.04 Ma. This reflects a more rapid recovery for the terrestrial biosphere than for that of the marine realm, perhaps due to lower extinction rates in land plants than in marine primary producers. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.