Cenomanian (Upper Cretaceous) carbon isotope stratigraphy of terrestrial organic matter for the Yezo Group, Hokkaido, Japan

Go Ichiro Uramoto, Tomotaka Fujita, Akinori Takahashi, Hiromichi Hirano

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Carbon isotope fluctuations of sedimentary organic matter along the two geological traverses in the Yezo Group, Hokkaido, northern Japan, elucidate a detailed chemostratigraphy for the Cenomanian Stage on the northwestern Pacific margin. Visual characterization of the kerogen from mudstone samples shows that the major constituents of sedimentary organic matter originated as terrestrial higher plants. The atomic hydrogen/carbon ratios of the kerogen suggest that the original δ13C values of terrestrial organic matter (TOM) have not been affected significantly by thermal diagenesis. The patterns in two δ13CTOM curves are similar and independent of changes in lithology and total organic carbon contents, which suggests that TOM was mixed sufficiently before the deposition in the Yezo forearc basin for the δ13C composition having been homogenized. In addition, this implies that the Hokkaido δ13CTOM profiles represent the averaged temporal δ13C variations of terrestrial higher-plant vegetation in the hinterlands of northeast Asia during Cenomanian time. Three shorter-term (ca. 0.1 my duration) positive-and-negative δ13CTOM fluctuations of ∼1‰ are present in the Lower to Middle Cenomanian interval in the Yezo Group. On the basis of the age-diagnostic taxa (ammonoids, inoceramids and planktic foraminifers), these discrete δ13 CTOM events are interpreted to be correlated with those in the δ13C curves of pelagic carbonates from European basins. The correlation of δ13C events between the European and Yezo Group sections suggests that the shorter-term δ13C fluctuations in Cenomanian ocean-atmosphere carbon reservoirs are useful for global chemostratigraphic correlation of marine strata. In particular, the correlation of δ13C fluctuations of the so-called 'Mid-Cenomanian event' (MCE) implies: (i) the δ13C variations of global carbon reservoir during the MCE are precisely recorded in the °13C TOM records; and (ii) the MCE °13CTOM event is an efficient chronostratigraphic index for the Lower/Middle Cenomanian boundary of the Mid-Cretaceous sequences.

Original languageEnglish
Pages (from-to)465-478
Number of pages14
JournalIsland Arc
Volume16
Issue number3
DOIs
Publication statusPublished - 2007 Sep

Fingerprint

carbon isotope
stratigraphy
Cretaceous
organic matter
kerogen
carbon
chemostratigraphy
forearc basin
foraminifera
total organic carbon
mudstone
diagenesis
lithology
temporal variation
hydrogen
carbonate
atmosphere
vegetation
ocean
basin

Keywords

  • Carbon isotope stratigraphy
  • Cenomanian
  • Correlation
  • Cretaceous
  • Hokkaido
  • Japan
  • terrestrial higher plants
  • Yezo Group

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Cenomanian (Upper Cretaceous) carbon isotope stratigraphy of terrestrial organic matter for the Yezo Group, Hokkaido, Japan. / Uramoto, Go Ichiro; Fujita, Tomotaka; Takahashi, Akinori; Hirano, Hiromichi.

In: Island Arc, Vol. 16, No. 3, 09.2007, p. 465-478.

Research output: Contribution to journalArticle

Uramoto, Go Ichiro ; Fujita, Tomotaka ; Takahashi, Akinori ; Hirano, Hiromichi. / Cenomanian (Upper Cretaceous) carbon isotope stratigraphy of terrestrial organic matter for the Yezo Group, Hokkaido, Japan. In: Island Arc. 2007 ; Vol. 16, No. 3. pp. 465-478.
@article{a96229ed2c394955b1d9331a2178977d,
title = "Cenomanian (Upper Cretaceous) carbon isotope stratigraphy of terrestrial organic matter for the Yezo Group, Hokkaido, Japan",
abstract = "Carbon isotope fluctuations of sedimentary organic matter along the two geological traverses in the Yezo Group, Hokkaido, northern Japan, elucidate a detailed chemostratigraphy for the Cenomanian Stage on the northwestern Pacific margin. Visual characterization of the kerogen from mudstone samples shows that the major constituents of sedimentary organic matter originated as terrestrial higher plants. The atomic hydrogen/carbon ratios of the kerogen suggest that the original δ13C values of terrestrial organic matter (TOM) have not been affected significantly by thermal diagenesis. The patterns in two δ13CTOM curves are similar and independent of changes in lithology and total organic carbon contents, which suggests that TOM was mixed sufficiently before the deposition in the Yezo forearc basin for the δ13C composition having been homogenized. In addition, this implies that the Hokkaido δ13CTOM profiles represent the averaged temporal δ13C variations of terrestrial higher-plant vegetation in the hinterlands of northeast Asia during Cenomanian time. Three shorter-term (ca. 0.1 my duration) positive-and-negative δ13CTOM fluctuations of ∼1‰ are present in the Lower to Middle Cenomanian interval in the Yezo Group. On the basis of the age-diagnostic taxa (ammonoids, inoceramids and planktic foraminifers), these discrete δ13 CTOM events are interpreted to be correlated with those in the δ13C curves of pelagic carbonates from European basins. The correlation of δ13C events between the European and Yezo Group sections suggests that the shorter-term δ13C fluctuations in Cenomanian ocean-atmosphere carbon reservoirs are useful for global chemostratigraphic correlation of marine strata. In particular, the correlation of δ13C fluctuations of the so-called 'Mid-Cenomanian event' (MCE) implies: (i) the δ13C variations of global carbon reservoir during the MCE are precisely recorded in the °13C TOM records; and (ii) the MCE °13CTOM event is an efficient chronostratigraphic index for the Lower/Middle Cenomanian boundary of the Mid-Cretaceous sequences.",
keywords = "Carbon isotope stratigraphy, Cenomanian, Correlation, Cretaceous, Hokkaido, Japan, terrestrial higher plants, Yezo Group",
author = "Uramoto, {Go Ichiro} and Tomotaka Fujita and Akinori Takahashi and Hiromichi Hirano",
year = "2007",
month = "9",
doi = "10.1111/j.1440-1738.2007.00580.x",
language = "English",
volume = "16",
pages = "465--478",
journal = "Island Arc",
issn = "1038-4871",
publisher = "Wiley-Blackwell",
number = "3",

}

TY - JOUR

T1 - Cenomanian (Upper Cretaceous) carbon isotope stratigraphy of terrestrial organic matter for the Yezo Group, Hokkaido, Japan

AU - Uramoto, Go Ichiro

AU - Fujita, Tomotaka

AU - Takahashi, Akinori

AU - Hirano, Hiromichi

PY - 2007/9

Y1 - 2007/9

N2 - Carbon isotope fluctuations of sedimentary organic matter along the two geological traverses in the Yezo Group, Hokkaido, northern Japan, elucidate a detailed chemostratigraphy for the Cenomanian Stage on the northwestern Pacific margin. Visual characterization of the kerogen from mudstone samples shows that the major constituents of sedimentary organic matter originated as terrestrial higher plants. The atomic hydrogen/carbon ratios of the kerogen suggest that the original δ13C values of terrestrial organic matter (TOM) have not been affected significantly by thermal diagenesis. The patterns in two δ13CTOM curves are similar and independent of changes in lithology and total organic carbon contents, which suggests that TOM was mixed sufficiently before the deposition in the Yezo forearc basin for the δ13C composition having been homogenized. In addition, this implies that the Hokkaido δ13CTOM profiles represent the averaged temporal δ13C variations of terrestrial higher-plant vegetation in the hinterlands of northeast Asia during Cenomanian time. Three shorter-term (ca. 0.1 my duration) positive-and-negative δ13CTOM fluctuations of ∼1‰ are present in the Lower to Middle Cenomanian interval in the Yezo Group. On the basis of the age-diagnostic taxa (ammonoids, inoceramids and planktic foraminifers), these discrete δ13 CTOM events are interpreted to be correlated with those in the δ13C curves of pelagic carbonates from European basins. The correlation of δ13C events between the European and Yezo Group sections suggests that the shorter-term δ13C fluctuations in Cenomanian ocean-atmosphere carbon reservoirs are useful for global chemostratigraphic correlation of marine strata. In particular, the correlation of δ13C fluctuations of the so-called 'Mid-Cenomanian event' (MCE) implies: (i) the δ13C variations of global carbon reservoir during the MCE are precisely recorded in the °13C TOM records; and (ii) the MCE °13CTOM event is an efficient chronostratigraphic index for the Lower/Middle Cenomanian boundary of the Mid-Cretaceous sequences.

AB - Carbon isotope fluctuations of sedimentary organic matter along the two geological traverses in the Yezo Group, Hokkaido, northern Japan, elucidate a detailed chemostratigraphy for the Cenomanian Stage on the northwestern Pacific margin. Visual characterization of the kerogen from mudstone samples shows that the major constituents of sedimentary organic matter originated as terrestrial higher plants. The atomic hydrogen/carbon ratios of the kerogen suggest that the original δ13C values of terrestrial organic matter (TOM) have not been affected significantly by thermal diagenesis. The patterns in two δ13CTOM curves are similar and independent of changes in lithology and total organic carbon contents, which suggests that TOM was mixed sufficiently before the deposition in the Yezo forearc basin for the δ13C composition having been homogenized. In addition, this implies that the Hokkaido δ13CTOM profiles represent the averaged temporal δ13C variations of terrestrial higher-plant vegetation in the hinterlands of northeast Asia during Cenomanian time. Three shorter-term (ca. 0.1 my duration) positive-and-negative δ13CTOM fluctuations of ∼1‰ are present in the Lower to Middle Cenomanian interval in the Yezo Group. On the basis of the age-diagnostic taxa (ammonoids, inoceramids and planktic foraminifers), these discrete δ13 CTOM events are interpreted to be correlated with those in the δ13C curves of pelagic carbonates from European basins. The correlation of δ13C events between the European and Yezo Group sections suggests that the shorter-term δ13C fluctuations in Cenomanian ocean-atmosphere carbon reservoirs are useful for global chemostratigraphic correlation of marine strata. In particular, the correlation of δ13C fluctuations of the so-called 'Mid-Cenomanian event' (MCE) implies: (i) the δ13C variations of global carbon reservoir during the MCE are precisely recorded in the °13C TOM records; and (ii) the MCE °13CTOM event is an efficient chronostratigraphic index for the Lower/Middle Cenomanian boundary of the Mid-Cretaceous sequences.

KW - Carbon isotope stratigraphy

KW - Cenomanian

KW - Correlation

KW - Cretaceous

KW - Hokkaido

KW - Japan

KW - terrestrial higher plants

KW - Yezo Group

UR - http://www.scopus.com/inward/record.url?scp=34548297043&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34548297043&partnerID=8YFLogxK

U2 - 10.1111/j.1440-1738.2007.00580.x

DO - 10.1111/j.1440-1738.2007.00580.x

M3 - Article

VL - 16

SP - 465

EP - 478

JO - Island Arc

JF - Island Arc

SN - 1038-4871

IS - 3

ER -