| Project/Area Number |
12640478
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
地球化学
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| Research Institution | Rissho University |
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Principal Investigator |
FUKUOKA Takaaki Rissho University, Geo-Environmental Science, Professor, 地球環境科学部, 教授 (90080473)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Antarctic ice sheet / micro tephra particles / source volcanoes / tephrochronology / volcanic signal / LA / CPI-MS analysis / H15 ice core / aerosol / 氷床年代 / 微少固体粒子 / 微小火山灰粒子 / 火山性エアロゾル / ICP-MS / 噴火年代 / 微小固体粒子 / LA-ICP-MS |
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| Research Abstract |
Purpose of this research is to check a possibility of tephrochronological dating use of micro tephra particles in Antarctic ice sheet. The H15 ice core in Antarctica was used as sample.
1. We recognized the existence of 〜10μm size of micro tephra particles from the shape and the chemistry.
2. Comparison between the numbers of micro tephra partices and the concentration of SO_4^<2-> aerosol in H15 ice core indicates the types (ash type or gas type) that is (1) some of world wide eruptions release both tephra particles and SO_2 gas, (2) some of them release mainly SO_2 gas, and (3) some of them release mainly tephra particles.
3. We succeeded LA/ICP-MS analysis for single tephra particle of 100μm size. But for 10μm size of micro tephra particles did not complete.
4. Trace elements contents in some world wide eruption tephras were analyzed by instrumental neutron activation analysis.
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