Establishment of upper cretaceous bio- and carbon isotope stratigraphy in the northwest pacific ocean and radiometric ages around the albian/cenomanian, coniacian/santonian and santonian/campanian boundaries

Reishi Takashima, Hiroshi Nishi, Toshiro Yamanaka, Yuji Orihashi, Yasuyuki Tsujino, Xavier Quidelleur, Keiichi Hayashi, Ken Sawada, Hideto Nakamura, Takuto Ando

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The Yezo Group, exposed in Hokkaido, northern Japan, is one of the few strata that recorded Cretaceous paleo-oceanographic changes in the Pacific Ocean. Although the group yields abundant marine macro- and microfossils, sporadic occurrences of age-diagnostic species in several stratigraphic intervals has prevented high-resolution international biostratigraphic correlation. The proposed integrated bio- and carbon isotope stratigraphy of the Yezo Group, which is exposed in northwest Hokkaido, enables high-resolution international stratigraphic correlation spanning from Upper Albian to Lower Campanian. The correlation of the present study identifies the detailed stratigraphic horizons of the Albian/Cenomanian, Cenomanian/ Turonian, Turonian/Coniacian, Coniacian/Santonian, and Santonian/Campanian boundaries, as well as the Late Cretaceous paleo-environmental events in the Yezo Group. The Yezo Group is also important in order to complement the chronometric age of the Cretaceous geologic time scale because the group includes numerous felsic tuffs. The U-Pb zircon ages of some of these tuffs, which are interbedded near the Albian/Cenomanian, Coniacian/Santonian and the Santonian/Campanian boundaries in the Yezo Group, are dated at 99.7±0.3 Ma (Quidelleur et al. 2011), 86.87±0.60/0.67 (internal/total error) Ma and 84.7±0.7/1.8 (internal/total error) Ma, respectively. These radiometric ages are consistent with the latest age model of the Cretaceous time scale.

Original languageEnglish
Pages (from-to)341-376
Number of pages36
JournalNewsletters on Stratigraphy
Volume52
Issue number3
DOIs
Publication statusPublished - 2019 Jun

Keywords

  • Carbon isotope stratigraphy
  • Cretaceous
  • Planktic foraminifera
  • U-Pb age
  • Yezo group

ASJC Scopus subject areas

  • Plant Science
  • Geology
  • Stratigraphy

Fingerprint Dive into the research topics of 'Establishment of upper cretaceous bio- and carbon isotope stratigraphy in the northwest pacific ocean and radiometric ages around the albian/cenomanian, coniacian/santonian and santonian/campanian boundaries'. Together they form a unique fingerprint.

  • Cite this