Rb-Sr whole-rock and biotite isochron ages of the Soeda Granodiorite, eastren North Kyushu

雅樹, 柚原; 淳志, 亀井; 修, 岡野; 良信, 川野; 寛雄, 加々美

doi:10.2465/gkk.120924

Japanese Magazine of Mineralogical and Petrological Sciences

2013

DOI: 10.2465/gkk.120924

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Rb-Sr whole-rock and biotite isochron ages of the Soeda Granodiorite, eastren North Kyushu

柚原雅樹¹,

亀井淳志²,

岡野修³

et al.

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Cited by 3 publications

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U-Pb zircon ages and Sr and Nd isotope compositions of the Soeda Granodiorite, northern Kyushu, Southwest Japan

Yoshio

Kamei²,

Kawano

et al. 2019

Jour. Geol. Soc. Japan

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U-Pb zircon dating, rare earth elements (REE) analysis and Sr-Nd isotope analysis were conducted on samples from the Soeda Granodiorite in the eastern part of northern Kyushu, Southwest Japan. The Soeda Granodiorite is divided into two units, based on wholerock Sr content: the Ochiai and Irahara Granodiorites. These granodiorites are composed mainly of medium-grained hornblende-biotite granodiorite to biotite granite. U-Pb zircon ages of. . Ma and. . Ma were obtained from the Ochiai and Irahara Granodiorites, respectively. These suggest that timing of intrusion of each of the granodiorite magmas were different. REE and Sr-Nd isotopic compositions of source magmas of the Ochiai and Irahara Granodiorites also differ.

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U-Pb zircon ages and Sr and Nd isotope compositions of the Soeda Granodiorite, northern Kyushu, Southwest Japan

Yoshio

Kamei²,

Kawano

et al. 2019

Jour. Geol. Soc. Japan

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Genesis of the low-Sr Granitoid from the Cretaceous Granitic rocks in Northern Kyushu

Muraoka

Owada

Imaoka

et al. 2020

Jour. Geol. Soc. Japan

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Widespread Cretaceous granitic rocks in north Kyushu have been geochemically classified into low-Sr and high-Sr granites by Izawa et al. ( , ). The Kokura-Tagawa Tectonic Line (KTT) in the region separates high-Sr granite to the west from low-Sr granite to the east. The Hirao granodiorite and a related granite dike are exposed on the east side of the KTT and have low Sr contents of ppm. In this study we consider the petrogenesis of the Hirao granodiorite and other low-Sr granites, in comparison with the nearby high-Sr Ushikiri-yama granodiorite. The Hirao granodiorite shows similar rare earth element(REE) patterns and Sr-Nd isotopic values to the granite dike. Mass balance calculations reveal that the granite dike magma could have been formed by the removal of plagioclase and hornblende from the Hirao granodiorite magma. The geochemical characteristics of the Hirao granodiorite, combined with the results of the melting experiments, confirm that the low-Sr granite magma could have been produced by relatively low-pressure melting, although the composition of the source of the Hirao granodiorite is similar to that of the high-Sr Ushikiri-yama granodiorite.

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The metamorphism of the Tagawa metamorphic rocks, eastern North Kyushu

Yoshio

Kiyoura²,

Hidaka

et al. 2021

Jour. Geol. Soc. Japan

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Rb-Sr whole-rock and biotite isochron ages of the Soeda Granodiorite, eastren North Kyushu

Cited by 3 publications

References 6 publications

U-Pb zircon ages and Sr and Nd isotope compositions of the Soeda Granodiorite, northern Kyushu, Southwest Japan

U-Pb zircon ages and Sr and Nd isotope compositions of the Soeda Granodiorite, northern Kyushu, Southwest Japan

Genesis of the low-Sr Granitoid from the Cretaceous Granitic rocks in Northern Kyushu

The metamorphism of the Tagawa metamorphic rocks, eastern North Kyushu

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