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1997 Fiscal Year Final Research Report Summary

Transition of clepositional sequences and fossil facies in the Crefaceous Yezo Supergroup

Research Project

Project/Area Number 07640619
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Stratigraphy/Paleontology
Research InstitutionIBARAKI UNIVERSITY

Principal Investigator

ANDO Hisao  Department of Environment Sciences, Faculty of Sciences, Ibaraki University, Associate Professor, 理学部, 助教授 (50176020)

Project Period (FY) 1995 – 1997
KeywordsCretaceous / Yezo Supergroup / depositronal sequence / sequence stratrgraphy / fossil facies / shallow-marine deposits / Bivalues / Hokkaido
Research Abstract

The uppermost Albian to upper Turonian Mikasa Formation and the Lower Campanian to Lower Maastrichtian Hakobuchi Group, both of which represent the shallow-marine depositional facies of the Yezo Supergroup in the meridional zone of Hokkaido, were investigated from viewpoint of sequence stratigraphy and molluscan biofacies transition. The Mikasa Formation is thought to be composed of three third-order depositional sequences (DS) formed by relative sea-level cycles. Although the lateral and vertical distribution of DSs and constituting systems tract are depending on horizons and geographic position, the basin center seems to have shifted from north to south. Shallow-marine shell beds tend to be contained in the lower shoreface to inner shelf facies of highstand systems tracts.
The Hakobuchi Group conspicuously consists of two third-order DSs in the Ashibetsu area, but more than seven DSs of somewhat smaller size in the southern Oyubari to Hobetsu areas. Therefore, relative sea-level chang … More es might have been locally different more or less among areas within the Yezo basin. Since the group in the Nakatonbetsu area of northern Hokkaido is dominated by very thick offshore mudstone facies, the comparison with the Ashibetsu to Hobetsu areas is difficult. But two or three DSs are presumed to exist there. The uppermost one may be Paleocene in age, judging from foraminiferal micropaleontology and paleomagnetic data.
Sequence stratigraphic schemes synthesized in this study are compared with other Upper Cretaceous strata in Northeast Japan. The general distribution patterns of DSs for those strata are well synchronous with the Haq curve (global sea-level curves), suggesting an influence of global eustacy, though not all, in addition to local tectonic movement.
Shallow-marine molluscan faunal changes of the Mikasa Formation at the Cenomanian-Turonian boundary suggest a remarkable extinction and drastic change of elements in benthic ecosystems. Though fossil beds are scarce in the Hakobuchi Group, such a remarkable change can not be observed during Campanian to early Maastrichtian at least. Less

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 安藤 寿男 ほか3名: "上部白亜系双葉層群の河川成〜浅海成堆積システム-堆積相と堆積シーケンス" 地学雑誌. 104. 284-303 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小松 俊文・安藤 寿男: "静岡県西部下部白亜系伊平層の層序と堆積環境" 地学雑誌. 105. 67-76 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hisao, Ando: "Apparent stacking palters of depositional sequences in the Opper Creta-ceous shallow-marine to flavial successions,Northeast Japan" Memoirs of the Geological Society of Japan. 48. 43-59 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 安藤 寿男・小玉 武史: "白亜紀セノマニアン-チューロニアンの浅海生二枚貝フォーナの変遷-奔別川セクションの中部蝦夷層群の三笠層" 三笠市立博物館紀要 自然科学. 2(印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ando, H., Seishi, M., Oshima, M.and Matsumaru, T.: "Fluvial-shallow marine depositronal systems of the Futaba Group (Upper Getaceous) -dopositional facies and sequences" Journal of Geography. vol.104. 284-303 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Komatsu, T.and Ando, H.: "Stratigraphy and sodimontary environment of the Lower Cretaceous Idaira Formation in the western past of Shizuoka Prefocture" Journal of Geography. vol.105. 67-76 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ando, H: "Apparent stacking patterns of depositional sequences in the Upper Gretaceous shallow-marine to fiuvial successions, Northeast Japan" Memoirs of Geologrcal Soclety. no.48. 43-59 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ando, H and Kodama, T.: "Shallow marine bivalvian faunal drange during Cenomanion to Turonoan, Late Cretaceous-Ponbetsu River soction in the Mikasa Formation, Middle Yezo Group, Hokkaido, Japan" Bulletin of Mikasa city Museum, Natural Science. no.2(in press). (1998)

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      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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