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New perspective on Aptian carbon isotope stratigraphy: Data from ¹³C records of terrestrial organic matter

¹ Institute of Geology and Paleontology, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
² Department of Mineralogy, Petrology and Economic Geology, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
³ Graduate School of Social and Cultural Studies, Kyushu University, Fukuoka 810-8560, Japan
⁴ National Science Museum, Shinjyuku-ku, Tokyo 169-0073, Japan

Carbon isotope analyses were performed on detrital woody materials in Aptian (mid- Cretaceous) marine sediments of central Hokkaido, northern Japan. A positive ¹³C_wood 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 ¹³C_wood profile is exactly in phase with the ¹³C_carbonate curve from a Pacific guyot when the age of the guyot carbonates is revised using published Sr isotope stratigraphies. The highly conformable ¹³C profiles of Pacific and Hokkaido sections suggest that ¹³C compositions of Aptian marine and terrestrial carbon reservoirs changed simultaneously by the same amplitude within the ocean-atmosphere-biosphere system. Fluctuation patterns of Tethyan ¹³C_carbonate curves are slightly different from those of Pacific and Hokkaido sections. Such differences in ¹³C profiles may be attributed to the local paleoceanographic setting of the Aptian Mediterranean Tethys.

Key Words: Cretaceous • Aptian • stable isotopes • organic carbon • terrestrial • Hokkaido

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