Palaeontological and geochemical study of Late Cretaceous oceanic anoxic event

晚白垩世海洋缺氧事件的古生物学和地球化学研究

• 批准号: 02640614
• 负责人: HIRANO Hiromichi
• 金额: $ 1.41万
• 依托单位: WASEDA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640614/
• 关键词: Cretaceous; Cenomanian Stage; Turonian Stage; Oceanic anoxic event; Hokkaido; Yezo Supergroup; セノマニアン・チュ-ロニアン境界; 大夕張; チュ-ロニアン期

We clarified the existence of the so-called Cenomanian/Turonian oceanic anoxic event, which is world-widely recognized except Northwestern Pacific, in the Cenomanian/Turonian boundary bed of the Middle Yezo Group distributed in Oyubari and Obira, Hokkaido by the study of lithofacies, megabiofacies, ichnofacies, sulphur contents and sulphur/organic carbon ratio. We reported this result in some domestic annual meetings and international conferences which were held in Grenoble, France and London, UK. The head investigator visited and sampled in North Tunisia, Africa and Provance, France and compared chemostratigraphical patterns across the C/T boundary between Hokkaido, North Tunisia and Provance, confirming the existence of the Cenomanian/Turonian oceanic anoxic event in the Northwestern Pacific. The head investigator carried out the field trip in the occasion of the 29th International Geological Congress at the C/T boundary exposures in Oyubari and Mikasa, Hokkaido, discussing the reliability of OAE at the studied beds.Thus we succeeded in getting the timing and world-wide scale of the event, and further subject which we are now studying is to clarify the causal factor in relation to the earth structure and its rhythm.

通过对北海道大夕张和大平地区中掖藏群的森诺曼期/土仑期界线层的岩相、巨岩相、遗迹相、硫含量和硫/有机碳比值的研究，阐明了除西北太平洋外世界公认的森诺曼期/土仑期海洋缺氧事件的存在。我们在法国格勒诺布尔和英国伦敦的国内年会和国际会议上报告了这一结果。首席调查员访问了非洲突尼斯北部和法国Provance，并进行了采样，比较了北海道、突尼斯北部和Provance之间C/T边界的化学地层模式，证实了西北太平洋存在Cenomanian/Turonian海洋缺氧事件。在第29届国际地质大会期间，首席研究员在北海道的大夕张和米卡萨的C/T边界暴露进行了实地考察，讨论了OAE在研究层的可靠性。因此，我们成功地获得了事件的时间和世界范围的规模，我们现在正在研究的进一步课题是澄清与地球结构及其节奏有关的原因。

项目成果

HIRANO,H.: "Oceanicanoxic event at the boundary of Cenomanian/Turonian ages-First report on the Cretaceous Yezo Supergroup, Hokkaido, Japan from the view of biostratigraphy of megafossils, sedimentary- and ichno-facies and geochemistry-" Bull.Sci.Engineer

HIRANO,H.：“塞诺曼阶/土伦阶时代边界的大洋氧化事件——从巨型化石、沉积相和地层相以及地球化学的生物地层学角度首次报告日本北海道白垩纪虾夷超群——”Bull.Sci。

HIRANO,H.: "Evolution of some Late Cretaceous desmoceratine ammonoids" Trans.Proc. Palaeont.Soc.Japan, N.S.no.157. 383-412 (1990)

HIRANO,H.：“一些晚白垩世去氨角菊素的演化”Trans.Proc。

平野 弘道: "白亜紀Cenomanian/Turonian期境界に認められる海洋無酸素事変ー北海道蝦夷累層群の例ー"

Hiromichi Hirano：“在白垩纪的塞诺曼阶/土伦阶边界发现的海洋缺氧事件 - 北海道虾夷组群的一个例子”

ASAI,A.: "Stratigraphy of the Upper Cretaceous in the Obirashibe area,Northwestern Hokkaido." Gakujustu-Kenkyu,Ser.Biol.& Geol.,School of Education,Waseda University. 39. 37-50 (1990)

ASAI,A.：“北海道西北部 Obirashibe 地区上白垩纪的地层学”。

平野 弘道: "化石記録からみた大量絶滅-アンモナイトからわかる事-" 日本古生物学会「化石」. 50. 19-22 (1991)

Hiromichi Hirano：“从化石记录中看到的大规模灭绝 - 我们可以从菊石中学到什么”日本古生物学会“化石”50. 19-22 (1991)。