Isotopic ages of the Usukigawa quartzdiorite along the Usuki-Yatsushiro tectonic line in eastern Kyushu and their geological significance

Hideo Takagi, K. Shibata, K. Suzuki, T. Tanaka, K. Ueda

    Research output: Chapter in Book/Report/Conference proceedingChapter

    7 Citations (Scopus)

    Abstract

    K-Ar and Rb-Sr age determinations were carried out on the Usukigawa quartzdiorite and associated metamorphic rocks along the Usuki-Yatsushiro Tectonic Line in eastern Kyushu, Southwest Japan. The Usukigawa quartzdiorite is composed of hornblende-biotite quartzdiorite to tonalite, and those in the western area of the body are strongly mylonitized. K-Ar hornblende ages of four samples of the Usukigawa quartzdiorite range from 252 to 272 Ma. Rb-Sr whole-rock isochron for four quartzdioritic rocks and three aplitic rocks gives an age of 275 ± 56 Ma with an initial 87Sr/86Sr ratio of 0.7040. On the other hand, K-Ar hornblende age of amphibolite which is intercalated as a small lenticular body along the northern boundary fault of the quartzdiorite is 124 Ma. The results of age and initial Sr isotope ratio of the Usukigawa quartzdiorite suggest that this Permian granitoid is correlative to the Kinshozan quartzdiorite which forms a nappe structure on the Mikabu green rocks in the Kanto Range, and is also correlative to the granitic clasts in the Usuginu-type conglomerate in South Kitakami belt. On the other hand, the K-Ar hornblende age of amphibolite and lithology of pelitic gneiss which is intercalated along the southern boundary fault of the quartzdiorite suggest that these high-grade metamorphic rocks are correlative to the Oshima metamorphic rocks in the Maana belt in western Shikoku and the Yorii metamorphic rocks in Kanto Range, and also correlative to the Takanuki metamorphic rocks in the Abukuma belt. The correlation of rocks mentioned above and close association and occurrence of three rock types; Permian granitoid Early Cretaceous high-grade metamorphic rocks and Late Cretaceous terrigenous sediments strongly suggest that the rocks of South Kitakami and Abukuma belts remain as a nappe on the Sambagawa metamorphic rocks in both Kanto and eastern Kyushu.

    Original languageEnglish
    Title of host publicationJournal - Geological Society of Japan
    Pages368-376
    Number of pages9
    Volume103
    Edition4
    Publication statusPublished - 1997

    Fingerprint

    metamorphic rock
    tectonics
    hornblende
    rock
    amphibolite
    granitoid
    nappe
    Permian
    Cretaceous
    tonalite
    age determination
    clast
    gneiss
    conglomerate
    biotite
    lithology
    isotope
    sediment

    ASJC Scopus subject areas

    • Earth and Planetary Sciences(all)
    • Environmental Science(all)

    Cite this

    Takagi, H., Shibata, K., Suzuki, K., Tanaka, T., & Ueda, K. (1997). Isotopic ages of the Usukigawa quartzdiorite along the Usuki-Yatsushiro tectonic line in eastern Kyushu and their geological significance. In Journal - Geological Society of Japan (4 ed., Vol. 103, pp. 368-376)

    Isotopic ages of the Usukigawa quartzdiorite along the Usuki-Yatsushiro tectonic line in eastern Kyushu and their geological significance. / Takagi, Hideo; Shibata, K.; Suzuki, K.; Tanaka, T.; Ueda, K.

    Journal - Geological Society of Japan. Vol. 103 4. ed. 1997. p. 368-376.

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Takagi, H, Shibata, K, Suzuki, K, Tanaka, T & Ueda, K 1997, Isotopic ages of the Usukigawa quartzdiorite along the Usuki-Yatsushiro tectonic line in eastern Kyushu and their geological significance. in Journal - Geological Society of Japan. 4 edn, vol. 103, pp. 368-376.
    Takagi H, Shibata K, Suzuki K, Tanaka T, Ueda K. Isotopic ages of the Usukigawa quartzdiorite along the Usuki-Yatsushiro tectonic line in eastern Kyushu and their geological significance. In Journal - Geological Society of Japan. 4 ed. Vol. 103. 1997. p. 368-376
    Takagi, Hideo ; Shibata, K. ; Suzuki, K. ; Tanaka, T. ; Ueda, K. / Isotopic ages of the Usukigawa quartzdiorite along the Usuki-Yatsushiro tectonic line in eastern Kyushu and their geological significance. Journal - Geological Society of Japan. Vol. 103 4. ed. 1997. pp. 368-376
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    abstract = "K-Ar and Rb-Sr age determinations were carried out on the Usukigawa quartzdiorite and associated metamorphic rocks along the Usuki-Yatsushiro Tectonic Line in eastern Kyushu, Southwest Japan. The Usukigawa quartzdiorite is composed of hornblende-biotite quartzdiorite to tonalite, and those in the western area of the body are strongly mylonitized. K-Ar hornblende ages of four samples of the Usukigawa quartzdiorite range from 252 to 272 Ma. Rb-Sr whole-rock isochron for four quartzdioritic rocks and three aplitic rocks gives an age of 275 ± 56 Ma with an initial 87Sr/86Sr ratio of 0.7040. On the other hand, K-Ar hornblende age of amphibolite which is intercalated as a small lenticular body along the northern boundary fault of the quartzdiorite is 124 Ma. The results of age and initial Sr isotope ratio of the Usukigawa quartzdiorite suggest that this Permian granitoid is correlative to the Kinshozan quartzdiorite which forms a nappe structure on the Mikabu green rocks in the Kanto Range, and is also correlative to the granitic clasts in the Usuginu-type conglomerate in South Kitakami belt. On the other hand, the K-Ar hornblende age of amphibolite and lithology of pelitic gneiss which is intercalated along the southern boundary fault of the quartzdiorite suggest that these high-grade metamorphic rocks are correlative to the Oshima metamorphic rocks in the Maana belt in western Shikoku and the Yorii metamorphic rocks in Kanto Range, and also correlative to the Takanuki metamorphic rocks in the Abukuma belt. The correlation of rocks mentioned above and close association and occurrence of three rock types; Permian granitoid Early Cretaceous high-grade metamorphic rocks and Late Cretaceous terrigenous sediments strongly suggest that the rocks of South Kitakami and Abukuma belts remain as a nappe on the Sambagawa metamorphic rocks in both Kanto and eastern Kyushu.",
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    AU - Shibata, K.

    AU - Suzuki, K.

    AU - Tanaka, T.

    AU - Ueda, K.

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    N2 - K-Ar and Rb-Sr age determinations were carried out on the Usukigawa quartzdiorite and associated metamorphic rocks along the Usuki-Yatsushiro Tectonic Line in eastern Kyushu, Southwest Japan. The Usukigawa quartzdiorite is composed of hornblende-biotite quartzdiorite to tonalite, and those in the western area of the body are strongly mylonitized. K-Ar hornblende ages of four samples of the Usukigawa quartzdiorite range from 252 to 272 Ma. Rb-Sr whole-rock isochron for four quartzdioritic rocks and three aplitic rocks gives an age of 275 ± 56 Ma with an initial 87Sr/86Sr ratio of 0.7040. On the other hand, K-Ar hornblende age of amphibolite which is intercalated as a small lenticular body along the northern boundary fault of the quartzdiorite is 124 Ma. The results of age and initial Sr isotope ratio of the Usukigawa quartzdiorite suggest that this Permian granitoid is correlative to the Kinshozan quartzdiorite which forms a nappe structure on the Mikabu green rocks in the Kanto Range, and is also correlative to the granitic clasts in the Usuginu-type conglomerate in South Kitakami belt. On the other hand, the K-Ar hornblende age of amphibolite and lithology of pelitic gneiss which is intercalated along the southern boundary fault of the quartzdiorite suggest that these high-grade metamorphic rocks are correlative to the Oshima metamorphic rocks in the Maana belt in western Shikoku and the Yorii metamorphic rocks in Kanto Range, and also correlative to the Takanuki metamorphic rocks in the Abukuma belt. The correlation of rocks mentioned above and close association and occurrence of three rock types; Permian granitoid Early Cretaceous high-grade metamorphic rocks and Late Cretaceous terrigenous sediments strongly suggest that the rocks of South Kitakami and Abukuma belts remain as a nappe on the Sambagawa metamorphic rocks in both Kanto and eastern Kyushu.

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