| Project/Area Number |
15K05325
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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 |
Stratigraphy/Paleontology
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| Research Institution | Akita University |
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Principal Investigator |
Yamasaki Makoto 秋田大学, 国際資源学研究科, 准教授 (40344650)
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| Co-Investigator(Renkei-kenkyūsha) |
IKEHARA Minoru 高知大学, 海洋コア総合研究センター, 教授 (90335919)
SHIMADA Chieko 秋田大学, 大学院国際資源学研究科, 客員研究員 (60597186)
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| Project Period (FY) |
2015-10-21 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 地球史 / 浮遊性有孔虫 / 北部日本海地域 / 後期鮮新世 / 日本海北部地域 / 鮮新世 |
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| Outline of Final Research Achievements |
Late Pliocene to early Pleistocene paleoceanographic history in the Japan Sea was investigated based on faunal and isotopic records of planktic foraminifera from the Tentokuji and Sasaoka Formations in Akita Prefecture and the Maido Formation in Aomori Prefecture. In the early Pleistocene, the studied sections were characterized by neritic water fauna and stratified surface water from isotopic analysis while relatively warmer water fauna was abundant during the late Pliocene. These faunal and isotopic changes suggest that they correspond to northern hemisphere glaciation. This study also revealed that the occurrence of Globorotalia inflata s.l. was characterized by not only higher abundance, but also rather sporadic distribution throughout the studied section.
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