Chronological and isotope geological study of the Takato granite in the Ina district of the Ryoke belt, Southwest Japan Arc.

雅樹, 柚原; 寛雄, 加々美

doi:10.5575/geosoc.105.181

Cited by 12 publications

(18 citation statements)

References 8 publications

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“…Granulite xenoliths in Ryoke younger granite have been reported by Komatsu et al (1996), Yuhara (1997) and Baba (1998) in two districts of Ryoke metamorphic belt. One is the Yashima island in Yamaguchi prefecture in southwest Honshu island, the other is the Ina district in Nagano prefecture, central Honshu island.…”

Section: Discussionmentioning

confidence: 59%

“…Yuhara (unpubl. data, 1997) reported Rb–Sr and Sm–Nd isochron ages and Sr–Nd isotopic compositions. In Yashima island, granulite xenolith gave Sm–Nd whole rock–mineral isochron ages of 217 ± 18 Ma and 118.0 ± 1.6 Ma, and a Rb–Sr whole rock‐mineral isochron age of 87.0 ± 3.2 Ma.…”

Section: Discussionmentioning

confidence: 99%

“…In the Ina district, granulite xenolith gave Sm–Nd whole rock–mineral isochron age of 58.6 ± 5.4 Ma and a Rb–Sr system whole rock–mineral isochron age of 59.9 ± 0.9 Ma. These Cretaceous‐to‐Paleogene ages proably indicate a cooling time after heating caused by Cretaceous intrusives (Yuhara 1997). Figure 8 illustrates ɛSr(T) −ɛNd(T) relationship for the Higo metamorphic rocks and granulite xenolith in Ryoke younger granite.…”

Section: Discussionmentioning

confidence: 99%

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Sm–Nd, Rb–Sr and K–Ar geochronology of the Higo metamorphic terrane, west‐central Kyushu, Japan

1999

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The Higo metamorphic terrane situated in west‐central Kyushu island, southwest Japan, is composed of greenschist‐ to granulite‐facies metamorphic rocks. The southern part of the metamorphic terrane consists mainly of garnet–biotite gneiss and garnet–cordierite–biotite gneiss, and orthopyroxene or cordierite‐bearing S‐type tonalite with subordinate amounts of hornblende gabbro. Rb–Sr, Sm–Nd and K–Ar isotopic ages for these rocks have been determined here. The garnet–biotite gneiss gives an Sm–Nd age of 227.1 ± 4.9 Ma and a Rb–Sr age of 101.0 ± 1.0 Ma. The hornblende gabbro has an Sm–Nd age of 257.9 ± 2.5 Ma and a K–Ar age of 103.4 ± 1.1 Ma. These age differences of the same samples are due to the difference in the closure temperature for each system and minerals. The garnet‐cordierite–biotite gneiss contains coarse‐grained garnet with a zonal structure conspicuously distinguished in color difference (core: dark red; rim: pink). Sm–Nd internal isochrons of the garnet core and the rim give ages of 278.8 ± 4.9 Ma (initial 143Nd/144Nd ratio = 0.512311 ± 0.000005) and 226.1 ± 28.4 Ma (0.512277 ± 0.000038), respectively. These ages are close to formation of the garnet core and the rim. It has been previously suggested that the Higo metamorphic terrane belongs to the Ryoke metamorphic belt. But Sr and Nd isotopic features of the rocks from the former are different from those of the Ryoke metamorphic rocks, and are similar to those of the granulite xenoliths contained in the Ryoke younger granite.

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Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Sm–Nd, Rb–Sr and K–Ar geochronology of the Higo metamorphic terrane, west‐central Kyushu, Japan

1999

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“…(1997,2002), Yuhara (1994), Yuhara and Kagami (1999) and Yuhara et al (1998). The compositional field of the Archean biotite granite is taken after Moyen et al (2003).…”

Section: Accepted Manuscriptmentioning

confidence: 94%

Crustal differentiation due to partial melting of granitic rocks in an active continental margin, the Ryoke Belt, Southwest Japan

Akasaki

Owada

Kamei

2015

Lithos

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“…Grey lines indicate patterns of granitic rocks in the Ryoke metamorphic belt (Ishihara and Wu, 2001;Kutsukake, 2002;Ishihara, 2003;Ishihara and Chappell, 2007;Yuhara, 2008Yuhara, , 2011. Symbols are the same as those in Fig.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Trace and rare earth elements compositions of granitic rocks in Awaji Island, Southwest Japan Arc

Yoshio

Sano

Takahashi

2011

Bull. Geol. Surv. Japan

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Seven trace elements (As, Cr, Ga, Pb, S, Th and V) compositions of granitic rocks in Awaji Island were analyzed using X-ray fluorescence spectrometer at Fukuoka University. Rare earth elements (REE) compositions of some samples of the Granitic Rocks II and III from the island were also determined by instrumental neutron activation analysis at Ehime University. The variation trends of most trace elements of Granitic Rocks I, II and III overlap in Harker's diagrams. Samples, which were off main trend of major and trace elements in Harker's diagrams in previous analyses (Yuhara et al., 1998), are often off the variation trends of these trace elements in this study as well. Therefore, these trace elements are also useful for investigation of chemical variations of granitic rocks. Chondrite-normalized REE patterns are enriched in LREE and flat in HREE, and fit in those of granitic rocks in the Ryoke metamorphic belt.

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Chronological and isotope geological study of the Takato granite in the Ina district of the Ryoke belt, Southwest Japan Arc.

Cited by 12 publications

References 8 publications

Sm–Nd, Rb–Sr and K–Ar geochronology of the Higo metamorphic terrane, west‐central Kyushu, Japan

Sm–Nd, Rb–Sr and K–Ar geochronology of the Higo metamorphic terrane, west‐central Kyushu, Japan

Crustal differentiation due to partial melting of granitic rocks in an active continental margin, the Ryoke Belt, Southwest Japan

Trace and rare earth elements compositions of granitic rocks in Awaji Island, Southwest Japan Arc

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