Sr isotope ratios of Late Cretaceous to paleogene igneous rocks of the Misasa-Okutsu-Yubara area, eastern Sanin Province, southwest Japan.

宏, 須藤; 弘次, 本間; 政克, 笹田; 寛雄, 加々美

doi:10.5575/geosoc.94.113

Cited by 20 publications

(9 citation statements)

References 15 publications

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“…Similar isotopic scatter has been reported for gab broic masses not only in the Japanese Islands but elsewhere through the world (e.g. Gray et al, 1981;Ashwal and Wooden, 1983;Cliff et al, 1983;Sudo et al, 1988;Fujimaki et al, 1991). …”

Section: Resultssupporting

confidence: 81%

Sm-Nd isochron ages of mafic igneous rocks from the Ryoke Belt, Southwest Japan: Remains of Jurassic igneous activity in a late Cretaceous granitic terrane.

et al. 1995

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Sm-Nd whole rock isochron ages have been determined for metadiabase and gabbro of the Ikoma Mass in the Kinki Ryoke Belt of the Southwest Japan Arc. The ages and initial 143Nd/144Nd ratios are as follows: hornblende gabbro-norite, 180 ± 23 Ma, 0.512180 ± 0.000024; metadiabase, 197 ± 31 Ma, 0.512166 ± 0.000035; anorthositic gabbro, 169 ± 29 Ma, 0.512148 ± 0.000027. The combined age, using hornblende gabbro-norite and metadiabase, is 192 ± 19 Ma (0.512169 ± 0.000021). Similar rock types collected from other masses plot around the isochrons defined by their counterparts from the Ikoma Mass. These age data indicate that the mafic igneous activity took place in the Ryoke Belt (a late Cretaceous granitic terrane) during the middle to early Jurassic. Sm-Nd and Rb-Sr whole rock and mineral isochron ages of hornblende gabbro are 97.7 ± 5.5 Ma and 71.8 ± 9.5 Ma, respectively, which indicate thermal resetting of the gabbro by intrusion of granitic plutons. Cortlanditic gabbros from the Ikoma Mass and other masses do not plot on the Sm-Nd whole rock isochrons for hornblende gabbro-norite, metadiabase and anorthositic gabbro. This suggests that cortlanditic gabbros evolved independently from other gabbros.

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Section: Resultssupporting

confidence: 81%

Sm-Nd isochron ages of mafic igneous rocks from the Ryoke Belt, Southwest Japan: Remains of Jurassic igneous activity in a late Cretaceous granitic terrane.

et al. 1995

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“…Kijiyama cauldron A new hornblende age of 36.4 ± 1.9 Ma was obtained for Kijiyama andesite from a probable cauldron in the Misasa district of Tottori Prefecture. This is consistent with a biotite age of 37 ± 5 Ma (Shibata and Yamada, 1965) from the Shimokoya granite, and a Rb-Sr whole rock isochron age of 36 ± 14 Ma (Sudo et al, 1988) from the Namariyama granophyres, both of which intrude the Kijiyama andesite. These data indicate Late Eocene volcano-plutonism in Kijiyama.…”

Section: A23 Oyorogiyama Cauldronsupporting

confidence: 82%

K–Ar age and geochemistry of the SW Japan Paleogene cauldron cluster: Implications for Eocene–Oligocene thermo-tectonic reactivation

Imaoka

Kiminami

Nishida³

et al. 2011

Journal of Asian Earth Sciences

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“…Surv. Japan (1975 , Seki (1978Seki ( , 1981, Shibata (1979), Iizumi et al (1984, , Nakajima and Shirahase (1987) , Sudo et al (1988), Honma (written communication).…”

Section: Migration Of Late Cretaceous To Paleogene Ig Neous Activity mentioning

confidence: 99%

Rb-Sr whole rock isochron ages of granites from northern Shikoku and Okayama, Southwest Japan: Implications for the migration of the Late Cretaceous to Paleogene igneous activity in space and time.

et al. 1988

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Sr isotope ratios of Late Cretaceous to paleogene igneous rocks of the Misasa-Okutsu-Yubara area, eastern Sanin Province, southwest Japan.

Cited by 20 publications

References 15 publications

Sm-Nd isochron ages of mafic igneous rocks from the Ryoke Belt, Southwest Japan: Remains of Jurassic igneous activity in a late Cretaceous granitic terrane.

Sm-Nd isochron ages of mafic igneous rocks from the Ryoke Belt, Southwest Japan: Remains of Jurassic igneous activity in a late Cretaceous granitic terrane.

K–Ar age and geochemistry of the SW Japan Paleogene cauldron cluster: Implications for Eocene–Oligocene thermo-tectonic reactivation

Rb-Sr whole rock isochron ages of granites from northern Shikoku and Okayama, Southwest Japan: Implications for the migration of the Late Cretaceous to Paleogene igneous activity in space and time.

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