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JAEA Reports

(U-Th)/He dating analysis at Tono Geoscience Center, Japan Atomic Energy Agency; Determination of He contents (Contract research)

Kanno, Mizuho; Sueoka, Shigeru; Fukuda, Shoma

JAEA-Testing 2020-010, 38 Pages, 2021/03

JAEA-Testing-2020-010.pdf:3.07MB

This report provides procedures of He measurement for (U-Th)/He dating at Tono Geoscience Center, Japan Atomic Energy Agency. (U-Th)/He method is a radiometric dating based on alpha decay of U and Th series isotopes, being utilized as a thermochronometer. (U-Th)/He thermochronometries on zircon and apatite are especially useful to estimate thermal history at low temperatures. The procedures are presented with the details, tips, and cautions because parts of the procedures can be carried out by beginners, including students and contractors. This report also includes some document formats helpful for conducting the procedures.

Journal Articles

Current status and prospects of FT and (U-Th)/He dating laboratory at Japan Atomic Energy Agency

Sueoka, Shigeru; Shimada, Koji; Kanno, Mizuho; Yokoyama, Tatsunori

Fisshion, Torakku Nyusureta, (33), p.15 - 18, 2020/10

no abstracts in English

Oral presentation

Current status and prospects of FT and (U-Th)/He dating laboratory at Japan Atomic Energy Agency

Sueoka, Shigeru; Shimada, Koji; Kanno, Mizuho; Yokoyama, Tatsunori

no journal, , 

no abstracts in English

Oral presentation

Thermal characteristics of slab fluid in Hongu area, southwest Japan; Insights form thermochronology and fluid inclusion analyses

Sueoka, Shigeru; Kanno, Mizuho; Kawamura, Makoto; Niwa, Masakazu; Iwano, Hideki*; Danhara, Toru*

no journal, , 

no abstracts in English

Oral presentation

Exploration of the age standard for (U-Th)/He method; Chronometric investigations of the Nisatai Dacite

Fukuda, Shoma; Sueoka, Shigeru; Kanno, Mizuho; Kohn, B.*; Tagami, Takahiro*

no journal, , 

no abstracts in English

Oral presentation

Relationship between fault activity and chemical composition of fault gouge; An Attempt by linear discriminant analysis

Tateishi, Ryo*; Shimada, Koji; Niwa, Masakazu; Sueoka, Shigeru; Shimizu, Mayuko; Kanno, Mizuho; Ishii, Chikako; Ishimaru, Tsuneari

no journal, , 

The major difference between active faults and inactive faults is the elapsed time after the latest activity, and while active faults are considered to be on the order of $$10^{2}$$ to $$10^{4}$$ years, inactive faults are over $$10^{5}$$ years. Therefore, even if the phenomena caused by fault activity are the same in both cases, the chemical changes that occur during the subsequent rest period of fault activity may differ significantly. In this study, the chemical composition of fault clay was collected by literature values and actual analysis, and the feasibility of discrimination by the chemical composition examined by linear discriminant analysis. According to the 11 elements selected based on the AIC, 45 active fault samples and 51 inactive fault samples were identified with a discrimination rate of 96%. Among the elements, TiO$$_{2}$$ and P$$_{2}$$O$$_{5}$$ tended to be concentrated as the latest activity period was newer. These concentration mechanisms are for future work.

Oral presentation

Relationship of exchangeable cations in fault gouges with their whole-rock chemical compositions

Kanno, Mizuho; Niwa, Masakazu; Shimada, Koji; Tateishi, Ryo*

no journal, , 

It has been reported that there is a slight difference in the chemical composition of the whole rock between the fault gouge generated by fault activity and the uncrushed host rock. The reason for this is not clear, but since many fault gouges are rich in clay minerals, it is possible that the elements adsorbed on the surface of the clay minerals have some effect. Therefore, exchangeable cations were extracted by substituting cesium ions, which are easily adsorbed on the clay mineral surface, for the fault gaudis of active faults and inactive faults, and compared with the whole rock composition. A concentric logarithmic ratio transformation was used for the comparison. As a result, the concentration of inactive faults tended to be higher than that of active faults in Rb.

Oral presentation

Holocene crustal movements recorded in fossil calcareous assemblages around the Cape Hane, Shikoku, Southwestern Japan

Tsukahara, Yuzuko; Kanno, Mizuho; Goto, Akira; Fujita, Natsuko; Komatsu, Tetsuya; Maemoku, Hideaki*

no journal, , 

Holocene crustal movements are recorded as fossil calcareous assemblages on rocky coast. It is possible to reconstruct crustal movements by summarizing these heights, structures and $$^{14}$$C ages. In this study, to clarify crustal movements, we collected calcareous assemblages and dated them using the $$^{14}$$C at Cape Hane. $$^{14}$$C ages show forming period of the lowest wave-cut-bench. However, it is difficult to determine the history of emerged events in a short cycle. To reconstruct the crustal movement history precisely, it is necessary to identify obvious multi-layer structures or discontinuous surfaces with time interval.

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