2012 Fiscal Year Final Research Report
Accurate dating for volcanic glass shards of middle Pleistocene widespread tephra determined by ITP-FT method and DC-FT method
| 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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| Keywords | テフロクロノロジー / 第四紀学 / 年代測定 |
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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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[Presentation] The outlook ofフィッション・トラック年代測定は整合的で あり、本方法は火山ガラスの年代測定を行う 上できわめて有為な方法であると考えられ る。本研究で、明らかになった問題点としては、 ITP-FT 法および DC-FT 法による年代測定は、きわめて時間がかかるということである。作tephrochronology in the northwestPacific, the Sea of Japan and the Sea of Okhotsk. Eos Trans. AGU, 91(26), Ocean Sci. Meet. Suppl., Abstract, GO45A-07. (poster)2010
Author(s)
Aoki, K.
Organizer
February中期更新世火山灰(テフラ)の火山ガラスの22th-26th,2010
Place of Presentation
Ocean Sciences Meeting, Portland, Oregon, USA
Year and Date
20100000
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