Carbon isotope fluctuations of terrestrial organic matter for the Upper Cretaceous (Cenomanian - Santonian) in the Obira area of Hokkaido, Japan

Go Ichiro Uramoto, Yoshihiro Abe, Hiromichi Hirano

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Stratigraphic fluctuations of carbon isotope values of terrestrial organic matter within the Upper Cretaceous (Cenomanian - Santonian) sequence in the Obira area of Hokkaido, Japan, record distinctive δ13C fluctuations for the Cenomanian - Turonian boundary, the Middle Turonian, the upper Turonian - lower Coniacian, and the Santonian. A biostratigraphic framework of the age-diagnostic taxa (ammonoids, bivalves and planktic foraminifers) indicates that these δ13C fluctuation events are comparable with those recorded in δ13C data of terrestrial organic matter in Japan and marine carbonates in Europe. These correlations reinforce the utility of these δ13C events in terms of global chemostratigraphy. In particular, the δ13C patterns within the overall positive interval of the Cenomanian - Turonian boundary event are highly conformable between marine and terrestrial records. The consistent nature of these different records of δ13C fluctuation patterns demonstrates that the terrestrial organic δ13C data mirror the global-scale δ13C patterns in the carbon reservoir of ocean-atmosphere-terrestrial biosphere during the Cenomanian - Turonian boundary event. In addition, global correlation of short-term marine and terrestrial organic δ13C fluctuations of the Upper Cretaceous sequence indicate that the magnitude of several terrestrial organic δ13C events appears more amplified than that of coeval marine carbonate δ13C events. This correlation is interpreted to mean that the effects of local CO2 emission into the atmosphere by release of terrestrial methane hydrate or biomass burning of terrestrial vegetation in the hinterland of the NE Asian region have been superimposed on the global δ13C trend and resulted in the terrestrial organic δ13C records of the Yezo Group. © 2009

Original languageEnglish
Pages (from-to)761-774
Number of pages14
JournalGeological Magazine
Volume146
Issue number5
DOIs
Publication statusPublished - 2009

Fingerprint

Santonian
Cenomanian-Turonian boundary
carbon isotope
Cretaceous
organic matter
Turonian
chemostratigraphy
carbonate
Coniacian
atmosphere
biomass burning
biosphere
foraminifera
bivalve
methane
vegetation
carbon
ocean

Keywords

  • Carbon isotope stratigraphy
  • Hokkaido
  • Japan
  • Terrestrial organic matter
  • Upper Cretaceous

ASJC Scopus subject areas

  • Geology

Cite this

Carbon isotope fluctuations of terrestrial organic matter for the Upper Cretaceous (Cenomanian - Santonian) in the Obira area of Hokkaido, Japan. / Uramoto, Go Ichiro; Abe, Yoshihiro; Hirano, Hiromichi.

In: Geological Magazine, Vol. 146, No. 5, 2009, p. 761-774.

Research output: Contribution to journalArticle

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