Isotopic ages of the Pankenushi olivine gabbro complex, Hidaka magmatic belt, central Hokkaido, Japan: implications for the tectonic setting of Hidaka magmatism

Recent reconstructions of global plate motions suggest that the Izanagi-Pacific Ridge was subducted along the eastern margin of Eurasia at ca. 50 Ma. In the Hidaka magmatic zone (HMZ), which was located at the northeastern end of the Eurasian plate, three magmatic pulses occurred (46–45, 40–36, and 19–18 Ma). We report whole-rock geochemical and Sr-Nd-Pb isotopic data for 36 Ma high-Sr/Y (adakitic) rocks from the HMZ and show that these rocks formed by partial melting of oceanic crust and were emplaced as near-trench intrusions during ridge subduction. We reevaluate the nature of plutonic rocks in the HMZ and show that both the 46–45 and 40–36 Ma granitoids have essentially identical geochemical features. The distribution of plutons and magmatic cessation between 45 and 40 Ma are best explained by subduction of a ridge-transform intersection with a large offset of the ridge axis. The boundary between the Eocene granitoids corresponds to the position of a paleo–transform fault, and adakitic magmatism was caused by partial melting triggered by slab tearing at an overlapping spreading center. The paleoridge-transform configuration coincides with the locations of later large faults and a peridotite body.

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Subduction of the Izanagi-Pacific Ridge–transform intersection at the northeastern end of the Eurasian plate

Yamasaki

Shimoda

Tani

et al. 2021

Geology

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K–Ar ages of the Ryoke plutonic rocks in the Asuke area, Aichi prefecture, central Japan

徹

2013

Jour. Geol. Soc. Japan

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K-Ar ages of .. Ma (Kamihara Tonalite), . . Ma (Mitsuhashi Granodiorite), .. Ma (Inagawa Granite, massive facies), .. Ma (Inagawa Granite, gneissose porphyritic facies) and .. Ma (Busetsu Granite) were determined from the Ryoke plutonic rocks in the Asuke area, central Japan. All of these ages are interpreted to be cooling ages related to the blocking temperature of biotite. The coincident -Ma cooling ages of the Kamihara Tonalite, Mitsuhashi Granodiorite, massive facies of Inagawa Granite and Busetsu Granite in -Ma suggests that these plutonic rocks followed a common cooling path in this area after solidification of the Busetsu Granite (ca. -Ma). On the other hand, solidification age of the gneissose porphyritic facies of Inagwa Granite is ca. -Ma, and K-Ar age of .. Ma from the gneissose porphyritic facies of Inagawa Granite was younger than other plutonic rocks in the Asuke area. thus, the K-Ar age is concordantly interpreted as cooling age of the granite.

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日高火成活動帯北部，奥士別複合深成岩体周辺のホルンフェルスのK-Ar黒雲母年代

仁一郎¹,

哲也²,

康平³

et al. 2014

Jour. Geol. Soc. Japan

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Isotopic ages of the Pankenushi olivine gabbro complex, Hidaka magmatic belt, central Hokkaido, Japan: implications for the tectonic setting of Hidaka magmatism

Cited by 5 publications

References 50 publications

Subduction of the Izanagi-Pacific Ridge–transform intersection at the northeastern end of the Eurasian plate

Subduction of the Izanagi-Pacific Ridge–transform intersection at the northeastern end of the Eurasian plate

K–Ar ages of the Ryoke plutonic rocks in the Asuke area, Aichi prefecture, central Japan

日高火成活動帯北部，奥士別複合深成岩体周辺のホルンフェルスのK-Ar黒雲母年代

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