Zircon U-Pb age and Nd isotope geochemistry of latest Neoproterozoic to early Paleozoic Oeyama ophiolite: Evidence for oldest MORB-type oceanic crust in Japanese accretionary system and its tectonic implications

Kimura, Kosuke; Hayasaka, Yasutaka

doi:10.1016/j.lithos.2019.06.001

Cited by 18 publications

(6 citation statements)

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“…Ochi (1982) and Kagami et al (1985) indicated that the gabbroic rocks occur frequently in relatively large masses, and most of these gabbroic rocks occur as masses captured in granitoids. The geochemical results of gabbro from the Saijo body in the Oeyama ophiolite (Kimura and Hayasaka, 2019) were used for comparison since no detailed studies on trace element composition on gabbroic rocks are available in the literature. The Saijo body that consists of the mafic-ultramafic complex occurs in the Saijo area, northeastern Hiroshima Prefecture (Kimura and Hayasaka, 2019).…”

Section: Trace Elementsmentioning

confidence: 99%

“…The geochemical results of gabbro from the Saijo body in the Oeyama ophiolite (Kimura and Hayasaka, 2019) were used for comparison since no detailed studies on trace element composition on gabbroic rocks are available in the literature. The Saijo body that consists of the mafic-ultramafic complex occurs in the Saijo area, northeastern Hiroshima Prefecture (Kimura and Hayasaka, 2019). Kimura and Hayasaka (2019) suggested that the Oeyama ophiolite covers all other units as a nappe in the belt.…”

Section: Trace Elementsmentioning

confidence: 99%

“…The Saijo body that consists of the mafic-ultramafic complex occurs in the Saijo area, northeastern Hiroshima Prefecture (Kimura and Hayasaka, 2019). Kimura and Hayasaka (2019) suggested that the Oeyama ophiolite covers all other units as a nappe in the belt. The compositional ranges of the trace element compositions of gabbro from the Ryoke and Sangun belts are shown in the MORB-normalized pattern diagram (Fig.…”

Section: Trace Elementsmentioning

confidence: 99%

“…Solid triangles represent plutonic xenoliths from Hime-shima, with gabbro and diorite samples from the Ryoke belt (Ishihara and Chappell, 2007;Yuhara and Kagami, 2007, 2008, 2012Ishihara and Ohno, 2016) shown for comparison. Gabbro and diorite data from the Sangun belt from Kimura and Hayasaka (2019) are also shown, although data for samples from the Higo belt are not shown because there were insufficient data for a robust comparison. 2018), rather closer to the age of the Higo belt (~120 Ma; Sinh et al, 2019).…”

Section: Zircon U-pb Geochronologymentioning

confidence: 99%

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Origin of xenoliths within the Hime–shima volcanic group, Kyushu, southwestern Japan Arc

HIRAYAMA

Shibata

Yoshikawa

et al. 2022

Journal of Mineralogical and Petrological Sciences

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Granitic and gabbroic xenoliths have been found within dacitic lavas in the Hime-shima volcanic group (HVG) of northeastern Kyushu, Japan. The HVG is located near the boundary between the Ryoke and Sangun belts, suggesting that the HVG and associated crustal xenoliths may provide insights into the subsurface distribution of the Ryoke and Sangun belts in Kyushu. This study focuses on xenoliths obtained from the coastal boulders near the Kane Lava of the HVG. The HVG xenoliths consist of gabbro, gabbroic diorite, amphibolite, gneiss, basaltic andesite, and tuffaceous sandstone, with the latter two types resembling those found in the basement rocks of the HVG. The gabbroic xenoliths are geochemically similar to gabbros in the Ryoke belt. The U-Pb dating for zircon in the gneiss xenoliths yielded a metamorphic age of ~111 Ma with Th/U values <0.1, similar to the age obtained for metamorphic rocks in or of the Ryoke belt. The new data presented in this study indicate that the xenoliths in the HVG were derived from basement units associated with the Ryoke belt, which in turn, means that the HVG is tectonically underlain by the Ryoke belt. This also suggests that the Ryoke belt extends further north in Kyushu than was previously considered, as implied by the presence of this belt directly below the HVG.

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Section: Trace Elementsmentioning

confidence: 99%

Section: Trace Elementsmentioning

confidence: 99%

Section: Trace Elementsmentioning

confidence: 99%

Section: Zircon U-pb Geochronologymentioning

confidence: 99%

See 2 more Smart Citations

Origin of xenoliths within the Hime–shima volcanic group, Kyushu, southwestern Japan Arc

HIRAYAMA

Shibata

Yoshikawa

et al. 2022

Journal of Mineralogical and Petrological Sciences

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“…A Cambrian to Ordovician age for the Oeyama ophiolite is suggested by K–Ar dating of mafic intrusions (~ 450 Ma) (Nishimura, ) and zircon U–Pb dating of jadeitic metamorphic blocks (~ 530 Ma) in the associated mélange (K. Kimura & Hayasaka, ). The Oeyama ophiolite is one example of the widespread ophiolite units formed at this time, including the Hayachine–Miyamori ophiolite of the South Kitakami terrane (Ishiwatari, ; Ishiwatari, Sokolov, & Vysotskiy, ).…”

Section: Geological Terranesmentioning

confidence: 99%

The basement geology of Japan from A to Z

et al. 2020

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The Precambrian and lower Paleozoic units of the Japanese basement such as the Hida Oki and South Kitakami terranes have geological affinities with the eastern Asia continent and particularly strong correlation with units of the South China block. There are also indications from units such as the Hitachi metamorphics of the Abukuma terrane and blocks in the Maizuru terrane that some material may have been derived from the North China block. In addition to magmatism, the Japanese region has seen substantial growth due to tectonic accretion. The accreted units dominantly consist of mudstone and sandstone derived from the continental margin with lesser amounts of basaltic rocks associated with siliceous deep ocean sediments and local limestone. Two main phases of accretionary activity and related metamorphism are recorded in the Jurassic Mino-Tanba-Ashio, Chichibu, and North Kitakami terranes and in the Cretaceous to Neogene Shimanto and Sanbagawa terranes. Other accreted material includes ophiolitic sequences, e.g. the Yakuno ophiolite of the Maizuru terrane, the Oeyama ophiolite of the Sangun terrane, and the Hayachine-Miyamori ophiolite of the South Kitakami terrane, and limestone-capped ocean plateaus such as the Akiyoshi terrane. The ophiolitic units are likely derived from arc and back-arc basin settings. There has been no continental collision in Japan, meaning the oceanic subduction record is more complete than in convergent orogens seen in intracontinental settings making this a good place to study the geological record of accretion. Hokkaido lacks most of the Paleozoic history recognized in Honshu, Shikoku, Kyushu, and the Ryukyu Islands to the south and its geology reflects the Cenozoic development of two convergent domains with volcanic arcs, their approach, and eventual collision. The Hidaka terrane reveals a cross section through a volcanic arc and the main accretionary complex of the convergent system is represented by the Sorachi-Yezo terrane.

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Initiation of the Unazuki Belt, Southwest Japan, during the Carboniferous as an island arc system along the North China Craton

Oh,

Kawaguchi,

Lee

et al. 2024

Int J Earth Sci (Geol Rundsch)

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The Unazuki Belt, Southwest Japan, is a part of the Hida Belt, which is characterized as a plutono-metamorphic complex with a continental affinity formed between the late Paleozoic and early Mesozoic. The Unazuki Belt is known to be an important tectonic unit for the tectonic correlation between the proto-Japan and East Asian continents as it records Permo–Triassic tectono-thermal events, however, comprehensive chronology of the Unazuki Belt including the timing of the initiation of this Belt is yet unclear. The present study reveals certain Carboniferous magmatic and sedimentation events from the Unazuki Belt and their tectonic implications for the first time as follows. Zircon U–Pb age dating results and whole-rock geochemical compositions show that the protoliths of metagranite and metatrachyandesite in the Unazuki Belt formed at 328.2 ± 4.4 Ma and 332.8 ± 2.2 Ma, respectively, in an arc tectonic setting. Most metasedimentary rocks of the Unazuki Belt have the youngest detrital zircon grains of ~ 300 Ma with the Carboniferous single cluster at ~ 340–300 Ma without any Pre-360 Ma detrital zircon grains. However, one metasedimentary rock with Precambrian detrital zircons (~ 20%) has the youngest detrital zircon age of ~ 252 Ma, and ~ 66% of detrital zircons show a Permian age. Most of the εHf(t) values of zircon grains from all the studied Unazuki Belt samples, including the metasedimentary and metaigneous rocks with Carboniferous ages (~ 360–300 Ma) are positive (+ 6– + 18), whereas those of the zircon grains with Permian ages (~ 280–260 Ma) show wide variations between + 16 and -23. The whole-rock geochemical compositions of the ~ 300 Ma metasedimentary rocks of the Unazuki Belt show an island arc tectonic setting, whereas those of ~ 252 Ma metasedimentary rock have a continental arc affinity. These new data suggest that (1) igneous and sedimentary rocks in the Unazuki Belt formed in the island arc tectonic setting separated from the margin of continental crust during the Carboniferous but shifted to the continental arc tectonic setting during the latest Permian, (2) the collision between the island arc and continental arc may have caused the intermediate-P/T metamorphism during the Permian in the Unazuki Belt. The Carboniferous island arc tectonic setting in the Unazuki Belt indicates that the Hida Belt, including the Unazuki Belt, formed not at the margin of the South China Craton where Carboniferous subduction is absent but on the continuous subduction zone located along the eastern margin of the North China Craton, including the eastern margin of the northern Korean Peninsula where Carboniferous subduction occurred. Graphical Abstract

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Zircon U-Pb age and Nd isotope geochemistry of latest Neoproterozoic to early Paleozoic Oeyama ophiolite: Evidence for oldest MORB-type oceanic crust in Japanese accretionary system and its tectonic implications

Cited by 18 publications

References 38 publications

Origin of xenoliths within the Hime–shima volcanic group, Kyushu, southwestern Japan Arc

Origin of xenoliths within the Hime–shima volcanic group, Kyushu, southwestern Japan Arc

The basement geology of Japan from A to Z

Initiation of the Unazuki Belt, Southwest Japan, during the Carboniferous as an island arc system along the North China Craton

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