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Journal Articles

Intense chemical weathering in southwest Japan during the Pliocene warm period

Hatano, Nozomi*; Yoshida, Koki*; Adachi, Yoshiko*; Sasao, Eiji

Journal of Asian Earth Sciences, 184, p.103971_1 - 103971_13, 2019/10

 Times Cited Count:0 Percentile:100(Geosciences, Multidisciplinary)

Whole rock major and REE geochemistry and mineral compositions of the Pliocene sediments in southwest Japan reveal the effects of source rock compositions and grain sizes, as well as the relationship between sedimentary environments and the degree of chemical weathering in the Pliocene warm period. A wide variation in the degree of chemical weathering, source rock compositions and grain sizes were observed with vertical and spatial changes in the sedimentary environment. Regardless of the wide variety of source rock compositions and grain sizes, REE and kaolinite-rich clay mineral concentrations in sediments, of which CIA values are generally above 90, are indicative of the intense weathering conditions that prevailed in the Pliocene period (3-4 Ma) in southwest Japan.

Journal Articles

Thermal history analysis of granitic rocks in an arc-trench system based on apatite fission-track thermochronology; A Case study of the Northeast Japan Arc

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

Journal of Asian Earth Sciences; X (Internet), 1, p.100005_1 - 100005_9, 2019/06

no abstracts in English

Journal Articles

Position-by-position cooling paths within the Toki granite, central Japan; Constraints and the relation with fracture population in a pluton

Yuguchi, Takashi*; Sueoka, Shigeru; Iwano, Hideki*; Izumino, Yuya*; Ishibashi, Masayuki; Danhara, Toru*; Sasao, Eiji; Hirata, Takafumi*; Nishiyama, Tadao*

Journal of Asian Earth Sciences, 169, p.47 - 66, 2019/01

 Times Cited Count:1 Percentile:29.44(Geosciences, Multidisciplinary)

This study presents position-by-position t-T paths within a granitic pluton based on thermochronological data, and describes their constraints and their relationship with fracture frequency, as an example from the Toki granite, central Japan. The cooling paths have position-specific characteristics; a single t-T path does not represent the cooling behavior of the entire pluton. Such position-specific t-T paths enable us to evaluate three-dimensional thermal evolution within the granitic pluton, and thus can clarify the detailed formation history of the entire pluton after the incipient intrusion of the granitic magma into the shallow crust. This study reveals the relationship between position-specific t-T paths and fracture frequency, and thus provides a criterion for evaluating the fracture population in terms of thermal stress.

Journal Articles

Spatial variations in $$^{3}$$He/$$^{4}$$He ratios along a high strain rate zone, central Japan

Umeda, Koji; Kusano, Tomohiro; Ninomiya, Atsushi*; Asamori, Koichi; Nakajima, Junichi*

Journal of Asian Earth Sciences, 73, p.95 - 102, 2013/09

 Times Cited Count:2 Percentile:89.56(Geosciences, Multidisciplinary)

A linear zone with high strain rates along the Japan Sea coast, the Niigata-Kobe Tectonic Zone (NKTZ), is considered to be associated with rheological heterogeneities in the lower crust and/or upper mantle. Helium isotope variations along the NKTZ reveal a close association with the geophysical evidence for rheological heterogeneities in the crust and mantle. In the northern NKTZ where two large inland earthquakes occurred recently, there appear to be many samples with $$^{3}$$He/$$^{4}$$He ratios significantly higher than those observed in the fore-arc side of northeast Japan. A plausible source of mantle helium could be attributed to upward mobilization of aqueous fluids generated by dehydration of the subducting Pacific Plate slab.

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:2 Percentile:91.42(Geosciences, Multidisciplinary)

no abstracts in English

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