| Project/Area Number |
17K05674
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Tohoku University |
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Principal Investigator |
Takashima Reishi 東北大学, 学術資源研究公開センター, 准教授 (00374207)
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| Co-Investigator(Kenkyū-buntansha) |
西 弘嗣 東北大学, 学術資源研究公開センター, 教授 (20192685)
黒田 潤一郎 東京大学, 大気海洋研究所, 准教授 (10435836)
佐藤 隆文 東北大学, 多元物質科学研究所, 助手 (30643332)
折橋 裕二 弘前大学, 理工学研究科, 教授 (70313046)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 根室層群 / 白亜紀 / 古第三紀 / 絶滅事変 / 白亜紀/古第三紀境界 / 北海道 / K/Pg境界 / 年代モデル / K/Pg / 凝灰岩 / オスミウム同位体比 / 炭素同位体比 / 浮遊性有孔虫化石 / 地質学 / 地学史 / 白亜紀・古第三紀境界 |
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| Outline of Final Research Achievements |
The Cretaceou/Paleogene (K/Pg) boundary Event, occurred at 66 million years ago, is one of the most famous extinction events in the earth’s history, and is characterized by dying out dinosaur and ammonites. Our study discovered a continuous succession from the uppermost Cretaceous to the basal part of Paleocene in the Nemuro Group at Kawaruppu section based on planktic foraminifers, calcareous nannofossils and carbon isotope stratigraphy. We also identified prominent positive peak of iridium and platinum contents at the K/Pg boundary strata in the studied sequence. The K/Pg boundary at Kawaruppu section is 1 m thick strata which is considered to be the thickest K/Pg boundary muddy strata in the world. High resolution study of this strata has a potential to clarify detailed faunal and environmental change in the western North Pacific region during the K/Pg boundary Event.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究により，明瞭な白亜紀/古第三紀境界が東アジアで初めて発見された．また，今回発見された境界層は古環境変動の解析に適した泥質の堆積物の中では世界でも最も厚いため,同イベント発生時における北西太平洋の古環境変動を高解像度で明らかにすることができる．
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