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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
Hojo, Tomohiko*; Shibayama, Yuki; Ajita, Saya*; Koyama, Motomichi*; Akiyama, Eiji*
Materia, 61(7), p.413 - 418, 2022/07
no abstracts in English
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：8.23(Geosciences, Multidisciplinary)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.
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.
Nishimura, Hayato*; Hojo, Tomohiko*; Ajita, Saya*; Shibayama, Yuki*; Koyama, Motomichi*; Saito, Hiroyuki*; Shiro, Ayumi*; Yasuda, Ryo*; Shobu, Takahisa; Akiyama, Eiji*
Tetsu To Hagane, 107(9), p.760 - 768, 2021/09
Times Cited Count：0 Percentile：0(Metallurgy & Metallurgical Engineering)no abstracts in English
Nishimura, Hayato*; Hojo, Tomohiko*; Ajita, Saya*; Shibayama, Yuki*; Koyama, Motomichi*; Saito, Hiroyuki*; Shiro, Ayumi*; Yasuda, Ryo*; Shobu, Takahisa; Akiyama, Eiji*
ISIJ International, 61(4), p.1170 - 1178, 2021/04
Times Cited Count：3 Percentile：25.78(Metallurgy & Metallurgical Engineering)Kawakami, Sho*; Shibata, Yoshihide*; Watanabe, Kiyomasa*; Ono, Noriyasu*; Kajita, Shin*; Okamoto, Masaaki*; Isayama, Akihiko; Sugihara, Masayoshi*; Kawano, Yasunori; Lukash, V. E.*; et al.
no journal, ,
no abstracts in English
Kajita, Yuya*; Sueoka, Shigeru; Fukuda, Shoma; Yokoyama, Tatsunori; Kagami, Saya; Nagata, Mitsuhiro; Tagami, Takahiro*
no journal, ,
no abstracts in English
Minami, Saki*; Nagata, Mitsuhiro; Sueoka, Shigeru; Fukuda, Shoma; Kajita, Yuya*; Ogita, Yasuhiro; Yokoyama, Tatsunori; Kagami, Saya; Tagami, Takahiro*
no journal, ,
no abstracts in English
Nagata, Mitsuhiro; Fukuda, Shoma; Sueoka, Shigeru; Yokoyama, Tatsunori; Kagami, Saya; Niki, Sota*; Iwano, Hideki*; Danhara, Toru*; Ogita, Yasuhiro; Kajita, Yuya*; et al.
no journal, ,
no abstracts in English
Kajita, Yuya*; Sueoka, Shigeru; Fukuda, Shoma; Yokoyama, Tatsunori; Kagami, Saya; Nagata, Mitsuhiro; Kohn, B. P.*; Tagami, Takahiro*
no journal, ,
no abstracts in English
Fukuda, Shoma; Sueoka, Shigeru; Kajita, Yuya*; Kagami, Saya; Yokoyama, Tatsunori; Tagami, Takahiro*
no journal, ,
no abstracts in English
Fukuda, Shoma; Kohn, B.*; Sueoka, Shigeru; Kagami, Saya; Kajita, Yuya*; Minami, Saki*; Okamoto, Akira*; Tagami, Takahiro*
no journal, ,
The zircon (U-Th)/He (ZHe) system with a typical closure temperature of ~160-200 degree Celsius (Reiners et al., 2004), but lower for higher radiation damaged grains (Guenthner et al., 2013), offers the potential for evaluating thermal histories in the uppermost ~10 km of the crust. ZHe thermochronometry has been applied to different geological settings in order to estimate tectonics, uplift and denudation, basin evolution, etc. (Ault et al., 2019), which can also contribute to evaluating long-term tectonic stabilities for the geologic disposal project. We have attempted to assess suitable zircon samples as ZHe age standards by using rapid cooling rock samples of relatively young (
100 Ma) age. This is because such rock samples are expected to empirically exhibit simple thermal histories and little radiation damage. Therefore, age dispersion caused by radiation damage can be relatively small. In order to reassess previous data obtained by Tagami et al. (2003), ZHe analyses of the Pliocene Utaosa rhyolite (TRG-04 and -07) and the Miocene Buluk Tuff have been carried out. In addition, OD-3 zircon (Iwano et al., 2013), a zircon U-Pb age standard, was also analyzed. In this presentation, preliminary ZHe age data from these samples will be presented and compared to evaluate their suitability as ZHe reference materials.
Minami, Saki*; Sueoka, Shigeru; Fukuda, Shoma; Nagata, Mitsuhiro; Kohn, B. P.*; Yokoyama, Tatsunori; Kagami, Saya; Kajita, Yuya*; Tagami, Takahiro*
no journal, ,
Ajita, Saya*; Nishimura, Hayato*; Hojo, Tomohiko*; Koyama, Motomichi*; Fujita, Kenichi*; Kakinuma, Hiroshi*; Akiyama, Eiji*; Shibayama, Yuki
no journal, ,
no abstracts in English
Fukuda, Shoma; Sueoka, Shigeru; Kagami, Saya; Kajita, Yuya*; Tagami, Takahiro*
no journal, ,
To understand geoscientific phenomena (e.g., magmatism, seismicity, and, orogenesis) that occur actively along plate subduction zones at the Earth's surface, a quantitative approach plays a key role in uplift/subsidence and denudation on various timescales to reveal the mechanism of strain release and accumulation. In this study, we focus on the Northeast Japan Arc (NEJA) as an island arc with a typical topographic alighnment, and attempt to estimate the mountain formation process of the Ou Backbone Range (hereinafter, OBR) which locates in the center axis of the NEJA as a volcanic arc, based on thermochronology. It is expected to lead to the proposal of a vertical deformation model for volcanic arcs distributed in the plate subduction zone. We have applied low-temperatures ( 300 degree Celsius) thermochronometric approaches, mainly the apatite fission track and apatite (U-Th)/He (AFT and AHe, respectively) methods, to estimate the uplift of each island arc components (i.e., fore-arc, volcanic arc, back-arc) in the Northeast Japan Arc (NEJA). In this presentation, regarding the spatial distribution of ca. 20 AHe ages (39.1-1.5 Ma) and ca. 10 AFT ages (29.8-4.4 Ma) obtained so far in the southern part of the OBR, which already provided the doming uplift of the OBR, we attempted to obtain new AFT age data in order to expand the data for the blank areas where no ages were reported in order to develop a detailed uplift model. As a result, about 10 new AFT ages were obtained in the southern part of the OBR, ranging from a few tens to a few Ma. These results are consistent with the previously reported AFT ages, and suggest that the ages of a few Ma reflect uplift and denudation associated with strong compressive stress in the east-west direction after 3 to 2 Ma.
Minami, Saki*; Sueoka, Shigeru; Fukuda, Shoma; Nagata, Mitsuhiro; Kohn, B. P.*; Yokoyama, Tatsunori; Kagami, Saya; Kawakami, Tetsuo*; Higashino, Fumiko*; Abe, Noriaki; et al.
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