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Zircon U–Pb geochronology and Hf isotope geochemistry of magmatic and metamorphic rocks from the hida belt, southwest Japan

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Geoscience Frontiers 2021年第4期12卷 185-201页

作者： Deung-Lyong Cho Tae-Ho Lee Yutaka Takahashi Takenori Kato Keewook Yi Shinae Lee Albert Chang-sik Cheong Korea Institute of Geoscience and Mineral Resources Daejeon 34132Republic of Korea Geological Survey of Japan Tsukuba 305-8567Japan Institute for Space-Earth Environmental Research Nagoya UniversityNagoya 464-8601Japan Korea Basic Science Institute Ochang Center Cheongju 28119Republic of Korea

Zircon U–Pb and Hf isotope data integrated in this study for magmatic and metamorphic rocks fromthe hida belt,southwest Japan,lead to a new understanding of the evolution of the Cordilleran arc system along the ancestral margins of present-day Northeast *** microprobe data for magmatic zircon domains from eight mafic tointermediate orthogneisses in the Tateyama and Tsunogawa areas yielded weighted mean 206Pb/238U ages spanning the entire Permian period(302–254 Ma).Under cathodoluminescence,primary magmatic growth zones in the zircon crystals were observed to be partially or completely replaced by inward-penetrating,irregularly curved featureless or weakly zoned secondary domains that mostly yielded U–Pb ages of 250–240 Ma and relatively high Th/U ratios(>0.2).These secondary domains are considered to have been formed by solid-state recrystallization during thermal overprints associated with intrusions of hida *** whole-rock geochemical and Sr–Nd isotope data as well as zircon age spectra corroborate that the hida belt comprises the Paleozoic–Mesozoic Cordilleran arc system built upon the margin of the North China Craton,together with the YeongnamMassif in southern *** arcmagmatismalong this systemwas commenced in the Carboniferous and culminated in the Permian–Triassic transition *** positiveεHf(t)values(>+12)of late Carboniferous to early Permian detrital zircons in the hida paragneisses indicate that there was significant input from the depleted asthenospheric mantle and/or its crustal derivatives in the early stage of arc *** the other hand,near-chondriticεHf(t)values(+5 to−2)of magmatic zircons from late Permian hida orthogneisses suggest a lithospheric mantle *** isotopic differences between magmatic zircon cores and the secondary rims observed in some orthogneiss samples clearly indicate that the zircons were chemically open to fluids or melts during thermal *** highly positive zirconεHf(t)val

关键词： hida belt Zircon U–Pb age Hf isotope Cordilleran arc Yeongnam Massif

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