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Journal Articles

Eustatic change modulates exhumation in the Japanese Alps

King, G. E.*; Ahadi, F.*; Sueoka, Shigeru; Herman, F.*; Anderson, L.*; Gautheron, C.*; Tsukamoto, Sumiko*; Stalder, N.*; Biswas, R.*; Fox, M.*; et al.

Geology, 51(2), p.131 - 135, 2023/02

Journal Articles

Attempts to detect thermal anomalies associated with slab-derived fluid activities based on low-temperature thermochronology

Sueoka, Shigeru; Iwano, Hideki*; Danhara, Toru*; Okamoto, Akira*; Tagami, Takahiro*

Fisshion, Torakku Nyusureta, (35), p.1 - 4, 2022/12

no abstracts in English

Journal Articles

Evaluation of potential age standards for zircon (U-Th)/He thermochronometry; Results from further chronometric investigations

Fukuda, Shoma; Kohn, B. P.*; Sueoka, Shigeru; Danhara, Toru*; Iwano, Hideki*; Tagami, Takahiro*

Fisshion, Torakku Nyusureta, (35), p.7 - 10, 2022/12

In order to establish the age standard of zircon (U-Th)/He method, we performed zircon (U-Th)/He (hereinafter, ZHe) dating on 4 zircon samples. In this presentation, the Nohi rhyolite and the Mt. Wasso moonstone rhyolite as domestic samples, and Mt. Dromedary and OD-3 were also adopted as age standard zircons of fission-track and U-Pb methods. Consequently, regarding the ZHe age of the Nohi rhyolite indicated younger, which possibly reflected secondary heating, while ones of the others indicated consistent with previous thermochronometric data. Integrated with previously obtained ZHe data about 7 samples, the Utaosa rhyolite in the previous study showed a small age dispersion in grain ages, which infers a suitable candidate for the ZHe age standard. As future prospects, we are planning to conduct geochemical analyses and structure observations of these zircons for exploring the causal factors in age dispersions.

Journal Articles

Estimation of thermal/denudation histories in the Tanigawa-dake area based on thermochronological methods

Minami, Saki*; Sueoka, Shigeru; Fukuda, Shoma; Nagata, Mitsuhiro; Kohn, B. P.*; Yokoyama, Tatsunori; Kagami, Saya; Kajita, Yuya*; Tagami, Takahiro*

Fisshion, Torakku Nyusureta, (35), p.22 - 26, 2022/12

no abstracts in English

Journal Articles

Thermochronological data in the Kitakami Mountains and their interpretation

Kajita, Yuya*; Sueoka, Shigeru; Fukuda, Shoma; Tagami, Takahiro*

Fisshion, Torakku Nyusureta, (35), p.19 - 21, 2022/12

no abstracts in English

Journal Articles

U-Pb zircon dates from the Utaosa Rhyolite of the Teragi Group

Nagata, Mitsuhiro; Fukuda, Shoma; Sueoka, Shigeru; Nakajima, Toru; Kajita, Yuya*; Minami, Saki*; Okamoto, Akira*; Tagami, Takahiro*

Fisshion, Torakku Nyusureta, (35), p.15 - 18, 2022/09

We performed U-Pb dating on zircons from the Utaosa Rhyolite of the Teragi Group as part of the search for standard materials for dating of zircons. Previous studies about Utaosa Rhyolite have reported ca. 2.30-2.77 Ma zircon fission track, zircon (U-Th)/He, and biotite K-Ar ages. U-Pb dating was carried out on the multi-collector inductively coupled plasma mass spectrometer with a laser ablation system. The weighted mean $$^{238}$$U-$$^{206}$$Pb ages of 2.65$$pm$$0.16 Ma and 2.66$$pm$$0.15 Ma were obtained from two samples. These ages are consistent with the ages from the previous studies. Therefore the results show that zircons from the Utaosa Rhyolite may be effective as a standard material.

Journal Articles

Solidification pressures and ages recorded in mafic microgranular enclaves and their host granite; An Example of the world's youngest Kurobegawa granite

Suzuki, Kota*; Kawakami, Tetsuo*; Sueoka, Shigeru; Yamazaki, Ayu*; Kagami, Saya; Yokoyama, Tatsunori; Tagami, Takahiro*

Island Arc, 31(1), p.e12462_1 - e12462_15, 2022/09

 Times Cited Count:1 Percentile:45.26(Geosciences, Multidisciplinary)

Journal Articles

Vibration test and fatigue test for failure probability evaluation method with integrated energy

Kinoshita, Takahiro*; Okamura, Shigeki*; Nishino, Hiroyuki; Yamano, Hidemasa; Kurisaka, Kenichi; Futagami, Satoshi; Fukasawa, Tsuyoshi*

Transactions of 26th International Conference on Structural Mechanics in Reactor Technology (SMiRT-26) (Internet), 7 Pages, 2022/07

The seismic evaluation of key components such as reactor vessel is important for the Seismic Probabilistic Risk Assessment (S-PRA) in a Sodium-Cooled Fast Reactor (SFR). Many components were damaged by cumulative damage like fatigue damage during seismic ground motion. However, general evaluation method for key components under seismic ground motion has been based on static loads and elastic region of materials. More accurate evaluation method for S-PRA, which can evaluate the failure of key components such as reactor vessels, has been actually required. In this study, failure probability evaluation method with integrated energy was developed by comparing the energy with vibration tests and fatigue tests. Vibration tests were performed to evaluate integrated vibration energy at failure by energy balance equation and fatigue tests were performed to evaluate integrated vibration energy at failure based on experimental results of fatigue tests.

Journal Articles

Low-temperature thermochronology of active arc-arc collision zone, South Fossa Magna region, central Japan

Sueoka, Shigeru; Kobayashi, Yumi*; Fukuda, Shoma; Kohn, B. P.*; Yokoyama, Tatsunori; Sano, Naomi*; Hasebe, Noriko*; Tamura, Akihiro*; Morishita, Tomoaki*; Tagami, Takahiro*

Tectonophysics, 828, p.229231_1 - 229231_17, 2022/04

 Times Cited Count:1 Percentile:51.01(Geochemistry & Geophysics)

The South Fossa Magna zone, central Japan, has been an active collision zone between the Honshu Arc and the Izu-Bonin Arc since the middle Miocene and provides an excellent setting for reconstructing the earliest stages of continent formation. Multi-system geo-thermochronometry was applied to different domains of the South Fossa Magna zone, together with some previously published data, to reveal mountain formation processes, i.e., vertical crustal movements. Nine granitic samples yielded zircon U-Pb ages of 10.2-5.8 Ma ($$n$$ = 2), apatite (U-Th)/He (AHe) ages of 42.8-2.6 Ma ($$n$$ = 7), and apatite fission-track (AFT) ages of 44.1-3.0 Ma ($$n$$ = 9). Thermal history inversion modeling based on the AHe and AFT data suggested rapid cooling events confined within the study region at $$sim$$6-2 Ma. The Kanto Mountains may have undergone a domal uplift in association with their collision with the Tanzawa Block at $$sim$$5 Ma. However, this uplift may have slowed down following the migration of the plate boundary and late Pliocene termination of the Tanzawa collision. The Minobu Mountains and possibly adjacent mountains may have been uplifted by the motional change of the Philippine Sea plate at $$sim$$3 Ma. Therefore, the mountain formation in the South Fossa Magna zone was mainly controlled by collisions of the Tanzawa and Izu Blocks and motional change of the Philippine Sea plate. Earlier collisions of the Kushigatayama Block at $$sim$$13 Ma and Misaka Block at $$sim$$10 Ma appeared to have had little effect on mountain formation. Together with a $$sim$$90 deg. clockwise rotation of the Kanto Mountains at 12-6 Ma, these observations suggest that horizontal deformation predominated during the earlier stage of arc-arc collision, and vertical movements due to buoyancy resulting from crustal shortening and thickening developed at a later stage.

Journal Articles

Low-temperature constraints on the Alpine thermal evolution of the central parts of the Sredna Gora Zone, Bulgaria

Balkanska, E.*; Georgiev, S.*; Kounov, A.*; Anti$'c$, M.*; Tagami, Takahiro*; Sueoka, Shigeru; Wijbrans, J.*; Peytcheva, I.*

Geologica Carpathica, 73(1), p.3 - 23, 2022/02

 Times Cited Count:0 Percentile:0(Geosciences, Multidisciplinary)

Journal Articles

Two pulse intrusive events of the Pliocene Tanigawa-dake granites revealed from zircon U-Pb dating

Minami, Saki*; Nagata, Mitsuhiro; Sueoka, Shigeru; Fukuda, Shoma; Kajita, Yuya*; Ogita, Yasuhiro; Kagami, Saya; Yokoyama, Tatsunori; Tagami, Takahiro*

Earth, Planets and Space (Internet), 73(1), p.231_1 - 231_7, 2021/12

 Times Cited Count:1 Percentile:14.76(Geosciences, Multidisciplinary)

Journal Articles

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

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

Fisshion, Torakku Nyusureta, (34), p.9 - 13, 2021/12

In order to explore suitable zircon samples as standard minerals for the zircon (U-Th)/He (namely, ZHe) method, we have attempted to conduct ZHe analyses of the Nisatai dacite sampled in Iwate prefecture. Previous researches reported solid ages at 22-21 Ma and a rapid cooling pattern based on various geochronometric investigations, which inferred a potential of an age standard for ZHe method. Consequently, ZHe ages in this study yielded at 21.5 $$pm$$ 0.2 Ma having wide dispersion of grain ages from 40 Ma to 15 Ma, probably caused by random errors. As possible causes of age dispersion, the zoning of parent nuclei in a crystal and the heterogeneous rock pieces revealed by observations of thin-section are considerable. Therefore, the Nisatai dacite was concluded as unsuitable sample for the ZHe age standard. However, geochronologic data of other methods showed comparable ages such as zircon fission-track and U-Pb method, the Nisatai dacite may be used as these age standards. We will continue to explore another candidates for ZHe age standard, e.g., U-Pb age standards.

Journal Articles

Estimation of denudation history of the Kitakami Mountains based on apatite fission-track thermochronology

Kajita, Yuya*; Sueoka, Shigeru; Fukuda, Shoma; Yokoyama, Tatsunori; Kagami, Saya; Nagata, Mitsuhiro; Tagami, Takahiro*

Fisshion, Torakku Nyusureta, (34), p.14 - 16, 2021/12

For reconstructing the uplift/denudation history of the fore-arc side of the NE Japan Arc on geologic timescales, U-Pb dating and apatite fission-track (AFT) thermochronometry were applied to granitoids in Kitakami mountains. In addition, U-Pb dating for the Jodogahama rhyolite at the easternmost Kitakami mountains was also carried out to estimate the timing of volcanism and its thermal effect. Consequently, U-Pb ages of 122.7 Ma and 117.3 Ma for 2 samples of the Cretaceous granites and AFT ages ranging from 156.8 Ma to 70.3 Ma of 15 samples were obtained. Concerning the Jodogahama rhyolite, U-Pb age of 44.3 Ma was obtained. Integrated AFT data of this study and previous ones in Kitakami mountains, the trend of ages shows younging toward west. Although such age trend can be explained by volcanism of the Jodogahama reflecting the migration of a paleo-volcanic front, all AFT ages exhibited significantly older than U-Pb data of the Jodogahama and the thermal inverse modeling based on track length distributions provided slow cooling patterns. These observations did not supported the reheating of volcanism as a cause of age trend. As future prospects, we are planning to improve the reliability of age data based on additional analyses and apply an ultra low-temperature thermochronometer, e.g., ESR method.

Journal Articles

Estimation of intrusion ages in the Miocene-Pliocene granodiorite around the Tanigawa-dake based on zircon U-Pb dating

Minami, Saki*; Nagata, Mitsuhiro; Sueoka, Shigeru; Fukuda, Shoma; Kajita, Yuya*; Ogita, Yasuhiro; Yokoyama, Tatsunori; Kagami, Saya; Tagami, Takahiro*

Fisshion, Torakku Nyusureta, (34), p.4 - 8, 2021/12

This study employed U-Pb dating for determining the intrusive age of young (several Ma) granitoids in Tanigawa-dake area, where rapid and intense uplift/denudation has probably occurred in Japan. As results, U-Pb age of 109 Ma for the Cretaceous granodiorite and 3.95-3.19 Ma about 3 samples of the Pliocene granodiorites were obtained. These U-Pb ages showed consistent with previously reported ages based on thermochronometers having lower closure temperatures such as K-Ar or zircon fission-track methods. All previous data indicated younger ages than U-Pb ones in this study. Therefore, our U-Pb data can be interpreted as intrusive ages of young granitoids, inferring multiple events possibly occurred at least twice and contributed to the formation in young granitoids in the Tanigawa-dake area.

Journal Articles

Recent evolution of fission-track chronometry; Advanced analytical methods, understanding of annealing kinetics, and developments of new dating systems

Sueoka, Shigeru; Shimada, Koji; Hasebe, Noriko*; Tagami, Takahiro*

Radioisotopes, 70(3), p.189 - 207, 2021/03

no abstracts in English

Journal Articles

Basics of fission-track geo- and thermo-chronometry; Revisiting its history to explore future potential

Hasebe, Noriko*; Sueoka, Shigeru; Tagami, Takahiro*

Radioisotopes, 70(3), p.117 - 130, 2021/03

no abstracts in English

Journal Articles

Thermochronometric studies of mountains in island arc settings based on fission-track method; A Review

Fukuda, Shoma; Sueoka, Shigeru; Tagami, Takahiro*

Radioisotopes, 70(3), p.173 - 187, 2021/03

Thermochronometric studies (e.g., fission-track thermochronometry) on major orogenic belts, such as collision zones and/or cratons have been successfully conducted since 1970s. However, such studies in arc-trench systems were limited so far. According to the development of thermochrology in three decades, the applicability for these regions has been identified. Thus, recent thermochronometric studies in an island arc setting have been proceeding. This paper introduces the current status of thermochronometric studies for mountain building process on arc-trench settings, especially in island arcs.

Journal Articles

Solidification depth and crystallization age of the Shiaidani Granodiorite; Constraints to the average denudation rate of the Hida Range, central Japan

Kawakami, Tetsuo*; Sueoka, Shigeru; Yokoyama, Tatsunori; Kagami, Saya; King, G. E.*; Herman, F.*; Tsukamoto, Sumiko*; Tagami, Takahiro*

Island Arc, 30(1), p.e12414_1 - e12414_11, 2021/01

 Times Cited Count:3 Percentile:42.47(Geosciences, Multidisciplinary)

Journal Articles

Fission-track analysis using LA-ICP-MS; Techniques and procedures adopted at the new low-temperature thermochronology laboratory in Bulgaria

Balkanska, E.*; Georgiev, S.*; Kounov, A.*; Tagami, Takahiro*; Sueoka, Shigeru

Proceedings of the Bulgarian Academy of Sciences, 74(1), p.102 - 109, 2021/01

 Times Cited Count:1 Percentile:18.67(Multidisciplinary Sciences)

Journal Articles

Izu-Bonin arc collision and mountain formation of the South Fossa Magna region; New insight from low-temperature thermochronometry

Kobayashi, Yumi*; Sueoka, Shigeru; Fukuda, Shoma; Hasebe, Noriko*; Tamura, Akihiro*; Morishita, Tomoaki*; Tagami, Takahiro*

Fisshion, Torakku Nyusureta, (33), p.25 - 27, 2020/10

no abstracts in English

164 (Records 1-20 displayed on this page)