Palaeozoic basement and associated cover

Ehiro, Masayuki; Tsujimori, Tatsuki; Tsukada, Kazuhiro; Nuramkhaan, Manchuk

doi:10.1144/goj.2

Cited by 29 publications

(20 citation statements)

References 202 publications

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“…The Hida Belt is generally accepted as a remnant continental fragment that once belonged to the Asian continental margin prior to the opening of the East Sea (Sea of Japan) in Miocene times (Ehiro et al . 2016, p. 25). Gabbroic to dioritic dykes dated at 340–320 Ma in the Hida Belt have ε Nd (0) values ranging from −2.7 to +1.5 (Arakawa, Saito & Amakawa, 2000).…”

Section: Discussionmentioning

confidence: 99%

The tectonic setting of the eastern margin of the Sino-Korean Block inferred from detrital zircon U–Pb age and Nd isotope composition of the Pyeongan Supergroup (upper Palaeozoic – Lower Triassic), Korea

et al. 2017

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The upper Palaeozoic succession (Pyeongan Supergroup) in central eastern Korea is well correlated with the equivalent successions distributed in North China, suggestive of the Korean upper Palaeozoic being part of the Sino-Korean Block. Detrital zircon U–Pb ages and Sm–Nd isotope compositions of the Pyeongan Supergroup in the Samcheok coalfield of the Taebaeksan Basin were analysed. A single predominant zircon age peak at c. 1.9 Ga (> 70%) is marked in all sedimentary units, followed by varying amounts of minor late Palaeozoic grains (up to 30%). The rarity of Meso- to Neoproterozoic- and Silurian-aged zircons confirms that sediment influx from the South China and Qinling blocks was insignificant. The 2.0–1.8 Ga-dominated zircon age pattern and the Nd isotope composition (average εNd(0) = −15.5±4.0) of the Pyeongan Supergroup most closely reflect the signature of the Yeongnam Massif basements, which supports a previous hypothesis that the Pyeongan Supergroup was mostly derived from a palaeo-orogen located to the east–southeast. Relatively higher εNd(0) values (> −10.1) in the lowermost and the upper parts of the succession are closely matched by the increased occurrence of syn-depositional-aged zircons, which indicates considerable mixing of juvenile materials at c. 320 Ma and 260 Ma. Both arc-related magmatic events are interpreted to have been related to oceanic subduction, suggesting that the eastern margin of the Sino-Korean Block was an active continental margin during late Palaeozoic times.

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Section: Discussionmentioning

confidence: 99%

The tectonic setting of the eastern margin of the Sino-Korean Block inferred from detrital zircon U–Pb age and Nd isotope composition of the Pyeongan Supergroup (upper Palaeozoic – Lower Triassic), Korea

et al. 2017

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“…The Hida Gaien terrane occupies a narrow domain located in central Japan that forms the border region between the Hida-Oki terrane and a series of neighboring terranes (Figure 2a,b). The definition of this terrane differs between different workers (Kojima, Takeuchi, & Tsukada, 2005) and is also referred to as the Hida Marginal belt (or terrane) and in the Geology of Japan this terrane is discussed in chapters concerning both the Pre-Cretaceous accretionary complexes (Kojima et al, 2016) and Paleozoic basement and associated cover (Ehiro et al, 2016).…”

Section: Hida Gaien Terrane (Hg)mentioning

confidence: 99%

“…The Early Palaeozoic Oeyama ophiolite is one of the main units of the Sangun terrane and occupies the structurally highest position of the accretionary units of the inner zone of southwest Japan (Ehiro et al, 2016;Ishiwatari et al, 2016). The ophiolite mainly consists of serpentinized mantle peridotite.…”

Section: Oeyama Ophiolite (Oe)mentioning

confidence: 99%

“…In this contribution, we present a summary of the basement terranes of Japan. Several previous excellent summaries have been presented including Isozaki et al (2010), Wakita (2013) and most recently in the Geology of Japan (Chapters 1, 2a-2h, and 3: Ehiro, Tsujimori, Tsukada, & Nuramkhaan, 2016;Ishiwatari et al, 2016;G. Kimura, Hashimoto, Yamaguchi, Kitamura, & Ujiie, 2016;Kojima et al, 2016;Miyazaki, Ozaki, Saito, & Toshimitsu, 2016;Taira, Ohara, Wallis, Ishiwatari, & Iryu, 2016;Tatsumi et al, 2016;Ueda, 2016;S.…”

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confidence: 99%

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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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“…The Hida Belt is composed mainly of the Hida metamorphic rocks, the Unazuki metamorphic rocks and the Hida granites (Figure ; Takahashi, Cho, & Kee, ). The Hida metamorphic rocks are composed of poly‐metamorphosed orthogneisses, paragneisses, amphibolite and marble ranging from amphibolite to granulite facies, protoliths of which were formed in a continental shelf or rift region (Ehiro, Tsujimori, Tsukada, & Nuramkhaan, ; Kunugiza & Kaneko, ; Sohma & Kunugiza, ; Sohma et al, ). The Hida metamorphic rocks were considered to have been subjected to three events of metamorphism: the first at ca .…”

Section: Geological Outlinementioning

confidence: 99%