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Journal Articles

Low-temperature thermochronological database of bedrock in the Japanese Islands

Sueoka, Shigeru; Tagami, Takahiro*

Island Arc, 28(4), p.e12305_1 - e12305_8, 2019/07

no abstracts in English

Journal Articles

Thermal analysis along the Mozumi-Sukenobu fault, central Japan, based on zircon fission-track thermochronometry; Reexamination by using thermal history modeling

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

Fisshion, Torakku Nyusureta, 31, p.9 - 12, 2018/12

no abstracts in English

Journal Articles

Report on the International Conference on Thermochronology 2018 at Quedlinburg, Germany

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

Fisshion, Torakku Nyusureta, 31, p.26 - 29, 2018/12

no abstracts in English

Journal Articles

Elucidating uplift/denudation history of the NE Japan Arc by using low-temperature thermochronology

Fukuda, Shoma*; Sueoka, Shigeru; Hasebe, Noriko*; Tamura, Akihiro*; Arai, Shoji*; Tagami, Takahiro*

Fisshion, Torakku Nyusureta, (30), p.7 - 10, 2017/12

no abstracts in English

Journal Articles

Uplift and denudation history of the Akaishi Range, a thrust block formed by arc-arc collision in central Japan; Insights from low-temperature thermochronometry and thermokinematic modeling

Sueoka, Shigeru; Ikeda, Yasutaka*; Kano, Kenichi*; Tsutsumi, Hiroyuki*; Tagami, Takahiro*; Kohn, B. P.*; Hasebe, Noriko*; Tamura, Akihiro*; Arai, Shoji*; Shibata, Kenji*

Journal of Geophysical Research; Solid Earth, 122(8), p.6787 - 6810, 2017/08

no abstracts in English

Journal Articles

First report of (U-Th)/He thermochronometric data across Northeast Japan Arc; Implications for the long-term inelastic deformation

Sueoka, Shigeru; Tagami, Takahiro*; Kohn, B.*

Earth, Planets and Space (Internet), 69(1), p.79_1 - 79_18, 2017/05

 Times Cited Count:2 Percentile:64.06(Geosciences, Multidisciplinary)

no abstracts in English

Journal Articles

Thermochronological contribution to the Crustal Dynamics Project

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

Fisshion, Torakku Nyusureta, (29), p.1 - 2, 2016/12

no abstracts in English

Journal Articles

Report on the International Conference on Thermochronology 2016 in Maresias, Brazil

Sueoka, Shigeru; Tagami, Takahiro*

Fisshion, Torakku Nyusureta, (29), p.26 - 28, 2016/12

no abstracts in English

Journal Articles

New approach to resolve the amount of Quaternary uplift and associated denudation of the mountain ranges in the Japanese Islands

Sueoka, Shigeru; Tsutsumi, Hiroyuki*; Tagami, Takahiro*

Geoscience Frontiers, 7(2), p.197 - 210, 2016/03

 Times Cited Count:4 Percentile:55.98(Geosciences, Multidisciplinary)

Thermochronology is a discipline to determine the timing/temperature of past thermal events based on radiometric ages, which is used to reconstruct denudation history of mountains and has been successfully applied to major orogens worldwide. It has been however difficult to apply the method to relatively young/low-relief mountains in Japan. Nonetheless, the recent development of low-temperature thermochronology has greatly expanded its applicability. In this review, we introduce (1) tectonic and geomorphic settings of the Japanese Islands and their mountains, (2) previous attempts to measure uplift/denudation of the mountains in Japan by using methods other than thermochronology, (3) problems of the thermochronologic applications to reveal denudation histories of the Japanese mountains and overview of some previous attempts, and (4) a case study of the Kiso Range and discussions about the current effectivity and applicability of low-temperature thermochronology on the Japanese mountains.

Journal Articles

Compilation of thermochronometric ages of basement rocks in the Japanese Islands

Sueoka, Shigeru; Tagami, Takahiro*

Fisshion, Torakku Nyusureta, (28), p.8 - 10, 2015/12

We compiled previous thermochronometric data obtained from Japanese bedrocks for understanding island arc scale cooling and denudation history. About 370 apatite FT ages and 650 zircon FT ages were collected from more than 70 references including unpublished data. The ages range from Quaternary to Triassic. More data were reported in the mountainous regions in the Chubu and Kinki districts and accretionary prisms regions in the outer zone of SW Japan whereas only few data are available in NE Japan and Chugoku district.

Journal Articles

Development of low-temperature thermochronology and its application to uplift and denudational history of Japanese mountains

Sueoka, Shigeru; Tsutsumi, Hiroyuki*; Tagami, Takahiro*

Chikyu Kagaku, 69(1), p.47 - 70, 2015/01

Thermochronology is a discipline to determine the timing/temperature of past thermal events based on radiometric ages, which can be used to reconstruct denudation history of mountains by converting from cooling history and have been successfully applied to major orogens worldwide in the past 40 years. It has been however difficult to apply the method to relatively young/low-relief mountains in Japan. Nonetheless, the recent development of low-temperature thermochronology has greatly expanded its applicability. In this review paper, we introduce (1) fundamentals of thermochronology, (2) recent developments of low-temperature thermochronology, (3) analytic procedures, (4) previous studies in mountains ranges abroad, (5) previous studies about uplift/denudation of Japanese mountains, (6) previous thermochronometric studies in Japanese mountains, (7) case studies of the Kiso and Akaishi Ranges by the authors, and (8) the applicability and usefulness of thermochronology in Japanese mountains.

Journal Articles

Uplift and denudation history of the Yoro-Suzuka-Nunobiki mountains based on apatite fission-track thermochronology

Sueoka, Shigeru; Tsutsumi, Hiroyuki*; Tagami, Takahiro*; Hasebe, Noriko*; Tamura, Akihiro*; Arai, Shoji*; Shibata, Kenji

Fisshion, Torakku Nyusureta, (27), p.17 - 19, 2014/12

We are attempting to reveal uplift/denudation history of the Yoro-Suzuka-Nunobiki mountains, southwest Japan, by using apatite fission-track (AFT) thermochronology. We obtained AFT ages of 47-30 Ma. The ages are younger in the central and southern part of the Suzuka Range and get older to the north and south. Inverse thermal modeling based on the AFT ages and lengths indicates the difference among the ages reflect amount of denudation accommodate with the mountains uplifting in the past few million years. These results imply the process of the mountain uplifting of this area is more complicated than the developments of the basins propagating from south to north.

Journal Articles

Constraining the timing of brittle deformation and faulting in the Toki granite, central Japan

Yamasaki, Seiko*; Zwingmann, H.*; Yamada, Kunimi*; Tagami, Takahiro*; Umeda, Koji

Chemical Geology, 351, p.168 - 174, 2013/08

 Times Cited Count:18 Percentile:29.65(Geochemistry & Geophysics)

Constraining of the timing of fault zone formation is of fundamental geotectonic importance to understand structural evolution and brittle fault processes. Here, we present authigenic illite K-Ar age data from brittle fault zones comprising two gouges within the Toki granite, central Japan. The gouge samples were collected from a shaft at the Mizunami Underground Research Laboratory, and were separated into five grain-size fractions. K-Ar ages of clay fractions decrease with grain size, suggesting enrichment in finer fraction of more-recently grown authigenic illites. The K-Ar ages of the fractions range from 53.6 to 42.7 Ma (Paleogene-Early to Middle Eocene). The $$<$$0.1 $$mu$$m fractions yield ages of 42.7 and 46.5 Ma. This age range is consistent with the stability field of illite and the main temperature field of brittle deformation within the cooling history of the Toki granite, supported by extensive thermochronological data of the host rock.

Journal Articles

The First (U-Th)/He thermochronology of pseudotachylyte from the Median Tectonic Line, southwest Japan

Yamada, Kunimi; Hanamuro, Takahiro; Tagami, Takahiro*; Shimada, Koji; Takagi, Hideo*; Yamada, Ryuji*; Umeda, Koji

Journal of Asian Earth Sciences, 45(2), p.17 - 23, 2012/02

 Times Cited Count:1 Percentile:95.02(Geosciences, Multidisciplinary)

no abstracts in English

Journal Articles

Postcollisional exhumation history of the Tanzawa Tonalite Complex, inferred from (U-Th)/He thermochronology and fission track analysis

Yamada, Kunimi; Tagami, Takahiro*

Journal of Geophysical Research, 113(3), p.B03402_1 - B03402_10, 2008/03

We performed new thermochronometry for the Tanzawa Tonalite Complex to investigate the exhumation history caused by arc-arc collision. Typical (U-Th)/He ages were 2.0 $$pm$$ 0.2 Ma on apatite and 3.3 $$pm$$ 0.2 Ma on zircon and 4.5 to 6.9 Ma on zircon using the fission-track method. The exhumation rate has been calculated to be 0.5 to 1.5 mm/yr from $$sim$$ 7 to 3.3 Ma, $$sim$$ 2 mm/yr from 3.3 to 2.0 Ma and $$sim$$ 0.8 mm/yr from 2.0 to 0 Ma with an assumed geothermal gradient of 40$$^{circ}$$C/km. The exhumation rate has not changed significantly despite the simultaneous tectonic changes around the Tanzawa Mountains after $$sim$$ 7 Ma.

Oral presentation

Report of the (U-Th)/He dating system at Tono Geoscientific Research Unit, Japan Atomic Energy Agency

Yamada, Kunimi; Hanamuro, Takahiro; Tagami, Takahiro*; Yamada, Ryuji*; Umeda, Koji

no journal, , 

Japan Atomic Energy Agency have jointly set up the lab of the (U-Th)/He dating in cooperation with Kyoto University. At the present stage, samples are apatite and zircon. Infrared laser heating in vacuum chamber extracts helium. The helium is quantified using the MM5400 rare gas mass spectrometer and the sensitivity method. The sensitivity of the mass spectrometer is calibrated using standard air, a volume-known pipette, and a capacitance manometer. The ICP quadrupole mass spectrometer quantifies uranium and thorium using standard addition method after dissolution of the gas-extracted sample. Apatite is dissolved using HNO$$_{3}$$ and zircon is decomposed by the alkali-fusion method using XRF bead sampler and LiBO$$_{3}$$. We are performing the calibration of MM5400 and testing dissolution procedures for ICP at present, and will report detailed views of dating systems in addition to them.

Oral presentation

Results from the (U-Th)/He dating systems in Japan Atomic Energy Agency

Yamada, Kunimi; Hanamuro, Takahiro; Tagami, Takahiro*; Yamada, Ryuji*; Umeda, Koji

no journal, , 

no abstracts in English

Oral presentation

System report and measured data from geological samples using the new (U-Th)/He dating system at Tono Geoscience Center, Japan Atomic Energy Agency

Yamada, Kunimi; Hanamuro, Takahiro; Tagami, Takahiro*; Yamada, Ryuji*; Umeda, Koji

no journal, , 

In 1987, it was revealed that the (U-Th)/He ages of apatites might be cooling ages with very low temperature cooling. Because of the suggested useful possibility in geo- and thermochronology, the (U-Th)/He method has been quickly developed since 1990's. The (U-Th)/He method mainly applies to investigate the last event on a cooling or exhumation history of present rapid orogen and a thermal anomaly through an active fault at the present. Japan Atomic Energy Agency have jointly set up the lab of the (U-Th)/He dating in cooperation with Kyoto University and NIED. At the present stage, the accuracy and precision are roughly 20 and 10%, respectively, using the age known zircon from the Fish Canyon Tuff (FC3). In the presentation, we will introduce the ages of some age known samples.

Oral presentation

New (U-Th)/He dating systems and ages in Japan Atomic Energy Agency

Yamada, Kunimi; Hanamuro, Takahiro; Tagami, Takahiro*; Yamada, Ryuji*; Umeda, Koji

no journal, , 

Japan Atomic Energy Agency have jointly set up the system of the (U-Th)/He dating in cooperation with Kyoto University and National Institute for Earth Sciences and Disaster Prevention. Through this two years, helium extraction machine using an electronically-cooled diode laser, micro crusible system using XRF bead sampler and uranium and thorium quantification procedure without artificial spikes are developed. Now we produce new ages of some age known samples. At the present stage, the accuracy and precision are roughly 20 and 10%, respectively, using the age standard zircon from the Fish Canyon Tuff (FC3). In the presentation, we will introduce our systems and the ages detailedly.

Oral presentation

(U-Th)/He dating of Taki pseudotachylyte, Ryoke granites

Yamada, Kunimi; Takagi, Hideo*; Tagami, Takahiro*; Danhara, Toru*

no journal, , 

Taki pseudotachylyte first found along the MTL was formed after mylonitization of the Hatai Tonalite under amphibolite to greenschist facies conditions, and had been post-dated by cataclasis. We dated some zircons from the mylonited Tonalite around the pseudotachylyte using the (U-Th)/He method, the age corresponds approximately to the FT ages of the pseudotachylyte, not the Tonalite. This suggests that the ambient temperature for generating the pseudotachylyte was higher than the closure temperature of ZHe, and this is consistent with cataclasis temperature. In this case we can not say the age of the pseudotachylyte, however, we can constrain something for the age and cooling-denudation history of this fault. Now we continue to date zircons from the pseudotachylyte.

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