| Project/Area Number |
21740365
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Geology
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| Research Institution | Rissho University |
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Principal Investigator |
AOKI Kaori 立正大学, 大学院・地球環境科学研究科, 研究員 (30513163)
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| Project Period (FY) |
2009 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2010: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2009: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Keywords | テフロクロノロジー / 第四紀学 / 年代測定 / 火山灰編年 / 第四紀 / 火山ガラス / フィッショントラック / ITP-FT / DC-FT |
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| Research Abstract |
In this study, I innovated Isothermal Plateau Fission Track（ITP-FT）method and Diameter Correction Fission Track（DC-FT）method to date the volcanic glass shards of early to middle Quaternary tephra. First of all, it was necessarily to check the precision of counting system on the basis of standard dating samples. The reflecting light of microscope is effective to identify the edge of each fission track and improve the precision to measure the track diameter. Then, in order to compare age determined by ITP-FT and DC-FT to age determined by another dating method, 138 tephra beds in marine sedimentary cores, which collected by SO202-INOPEX cruise in 2009, were employed. Geochemistry of such marine tephra was determined by the electron microprobe analyzer. In this point, the eruptive age determined by ITP-FT and DC-FT dating methods seems to match with tephrostratigraphy, radiometric age, biostratigraphy, and oxygen isotopic stratigraphy in northwest Pacific. Hence, ITP-FT and DC-FT ding methods is useful to date early to middle Quaternary glass materials.
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