New perspective on Aptian carbon isotope stratigraphy: Data from δ13C records of terrestrial organic matter

Atsushi Ando, Takeshi Kakegawa, Reishi Takashima, Tsunemasa Saito

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87 Citations (Scopus)


Carbon isotope analyses were performed on detrital woody materials in Aptian (mid-Cretaceous) marine sediments of central Hokkaido, northern Japan. A positive δ13Cwood excursion (from -25.4‰ to -21.8‰) following a remarkable negative isotope shift is recognized in the early Aptian, and a small positive anomaly is also found in the latest Aptian. This δ13Cwood profile is exactly in phase with the δ13Ccarbonate curve from a Pacific guyot when the age of the guyot carbonates is revised using published Sr isotope stratigraphies. The highly conformable δ13C profiles of Pacific and Hokkaido sections suggest that δ13C compositions of Aptian marine and terrestrial carbon reservoirs changed simultaneously by the same amplitude within the ocean-atmosphere-biosphere system. Fluctuation patterns of Tethyan δ13Ccarbonate curves are slightly different from those of Pacific and Hokkaido sections. Such differences in δ13C profiles may be attributed to the local paleoceanographic setting of the Aptian Mediterranean Tethys.

Original languageEnglish
Pages (from-to)227-230
Number of pages4
Issue number3
Publication statusPublished - 2002 Mar 1


  • Aptian
  • Cretaceous
  • Hokkaido
  • Organic carbon
  • Stable isotopes
  • Terrestrial

ASJC Scopus subject areas

  • Geology

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