| Project/Area Number |
16H02233
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Geology
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
堀内 一穂 弘前大学, 理工学研究科, 助教 (00344614)
山本 裕二 高知大学, 教育研究部総合科学系複合領域科学部門, 教授 (00452699)
中村 教博 東北大学, 高度教養教育・学生支援機構, 教授 (80302248)
|
|---|
| Research Collaborator |
Kumagai Yuho
|
|---|
| Project Period (FY) |
2016-04-01 – 2019-03-31
|
| Project Status |
Completed (Fiscal Year 2018)
|
| Budget Amount *help |
¥43,940,000 (Direct Cost: ¥33,800,000、Indirect Cost: ¥10,140,000)
Fiscal Year 2018: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
Fiscal Year 2016: ¥28,470,000 (Direct Cost: ¥21,900,000、Indirect Cost: ¥6,570,000)
|
|---|
| Keywords | 古地磁気 / 古地磁気強度 / 伏角異常 / IODP / ベリリウム同位体 / ベリリウム同位体比 / 古地磁気学 / 海洋地質学 / 地球電磁気学 / 海洋地質 |
|---|
| Outline of Final Research Achievements |
A continuous geomagnetic paleointensity record during the last 8 million years was obtained uising marine sediment cores. Influence of sediment lithology variations on relative paleointensity estimations was evaluated and corrected. No discernible relation was found among mean paleointensity, polarity length, and polarity for this time interval. From inclination anomaly averaged over each polarity chron, the presence of a small polarity bias was confirmed for the last 5 million years. A shift of the sign of the inclination anomaly may have occurred before about 6 million years.
|
| Academic Significance and Societal Importance of the Research Achievements |
過去約800万年間の古地磁気強度変動及び伏角異常の連続的な記録を得たのは世界で初めてであり、学術的意義が大きい。また、現在当該分野で大きな問題となっている、相対古地磁気強度推定への堆積物岩相変化の影響について、それを見積もり補正する道をひらいたことで、今後、相対古地磁気強度記録の統計解析に基づいた、古地磁気強度と地球軌道要素の関係、逆転間隔との関係などの理解が進むと期待される。
|
