Geological evolution of Japan

Taira, Asahiko; Ohara, Yasuhiko; Wallis, Simon; Ishiwatari, Akira; Iryu, Yasufumi

doi:10.1144/goj.1

Cited by 28 publications

(22 citation statements)

References 117 publications

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“…With transform motion between the Pacific Plate and Japan, SW Japan underwent a period when subduction of the Pacific plate ceased but reinitiated at 17 Ma by subduction of younger Philippine Sea plate (Kimura et al, ). The main islands of Japan, both southwest and northeast Honshu, have been characterized as an accretionary complex with granitic volcanism indicative of subduction from at least the Jurassic (Taira et al, ). Since the history of accretion is long with a number of transcurrent displacements during the Jurassic (Taira et al, ), we have assigned a broad Jurassic age range to the long‐term subduction duration, 201 to 145 Ma.…”

Section: Data Setmentioning

confidence: 99%

“…The main islands of Japan, both southwest and northeast Honshu, have been characterized as an accretionary complex with granitic volcanism indicative of subduction from at least the Jurassic (Taira et al, ). Since the history of accretion is long with a number of transcurrent displacements during the Jurassic (Taira et al, ), we have assigned a broad Jurassic age range to the long‐term subduction duration, 201 to 145 Ma. On Kamchatka, there is little evidence for pre–Mesozoic rocks (Watson & Fujita, ).…”

Section: Data Setmentioning

confidence: 99%

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Subduction Duration and Slab Dip

Gurnis

2020

Geochem Geophys Geosyst

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The dip angles of slabs are among the clearest characteristics of subduction zones, but the factors that control them remain obscure. Here, slab dip angles and subduction parameters, including subduction duration, the nature of the overriding plate, slab age, and convergence rate, are determined for 153 transects along subduction zones for the present day. We present a comprehensive tabulation of subduction duration based on isotopic ages of arc initiation and stratigraphic, structural, plate tectonic and seismic indicators of subduction initiation. We present two ages for subduction zones, a long-term age and a reinitiation age. Using cross correlation and multivariate regression, we find that (1) subduction duration is the primary parameter controlling slab dips with slabs tending to have shallower dips at subduction zones that have been in existence longer; (2) the long-term age of subduction duration better explains variation of shallow dip than reinitiation age; (3) overriding plate nature could influence shallow dip angle, where slabs below continents tend to have shallower dips; (4) slab age contributes to slab dip, with younger slabs having steeper shallow dips; and (5) the relations between slab dip and subduction parameters are depth dependent, where the ability of subduction duration and overriding plate nature to explain observed variation decreases with depth. The analysis emphasizes the importance of subduction history and the long-term regional state of a subduction zone in determining slab dip and is consistent with mechanical models of subduction.

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Section: Data Setmentioning

confidence: 99%

Section: Data Setmentioning

confidence: 99%

Subduction Duration and Slab Dip

Gurnis

2020

Geochem Geophys Geosyst

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“…Other 3 results of ridge-approach model by Iwamori (2000), which incorporates mantle convection at depths >30 km and uses v = 6.3 cm/year, are shown by dashed bold lines labeled by the corresponding ages of the slab at trench, 2.5, 1.0 and 0 Ma. Katayama et al 2001 540 Ma Okamoto et al 2004-Miyamoto et al, 2007 ; Engebretson 89 Ma Okudaira and Yoshitake, 2004Nakajima et al, 1990;, 1991;Otsuki, 1992;, 1993;Sakaguchi, 1996;Maruyama et al, 1997;Iwamori, 2000;Aoya et al, 2003Wallis et al, 2009Nakajima et al, 2004aNakajima et al, 1990;, 199385-80 Ma Wallis et al, 2009Taira et al, 2016 89 Ma 86 Ma…”

Section: Fettes and Desmons 2007mentioning

confidence: 99%

Recognition of the ‘early’ Sambagawa metamorphism and a schematic cross-section of the Late-Cretaceous Sambagawa subduction zone

Aoya¹,

Endo²

2017

Jour. Geol. Soc. Japan

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Recent petrological studies on the Sambagawa metamorphic belt in Shikoku have recognized that the coarse-grained eclogite-bearing lithologies (so-called tectonic blocks in earlier studies) in the Besshi area exclusively preserve evidence for the early Sambagawa metamorphism, which can be related to onset of the Sambagawa subduction system during Early Cretaceous (c. Ma). Geological mapping and associated multidisciplinary studies on the regional (spatially widespread) Sambagawa metamorphism (both the eclogite-facies and main metamorphisms) have revealed the tectonic framework of the Late-Cretaceous Sambagawa subduction zone as follows: (i) a spreading ridge was approaching close to the trench; (ii) the subducting slab was coupled with the convective mantle at depth of > km; (iii) thickness of the hanging-wall continental crust waskm; and (iv) the forearc mantle wedge ( -km depth) was largely serpentinized. These features allow us to draw a semi-quantitative cross-section of the Sambagawa subduction zone at around -Ma, implying that boundary conditions for thermo-mechanical modeling aiming to simulate exhumation of high-P/T metamorphic rocks are now well constrained. It has also become clear that ultramafic blocks dispersed in the higher-grade part of the Sambagawa belt were derived from the mantle wedge, i.e. the corresponding part of the belt has been re-evaluated as a fossil subduction boundary of a relatively warm subduction zone. Field-based petrological studies in the Sambagawa belt can, therefore, have potential to provide invaluable information on material behaviors at the slab-mantle wedge interface including domains of episodic tremor and slip (ETS) in presentday warm subduction zones.

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“…The Japanese Islands are composed mainly of subhorizontal nappe piles of an accretionary complex of late Paleozoic-Cenozoic age and their metamorphosed equivalents (Faure 1985;Isozaki et al 1990). They are divided into several geologic units with discontinuous ages of accretion (Faure et al 1986a;Taira et al 1989;Ichikawa 1990;Isozaki & Maruyama 1991). The thrust sheets of accretionary complexes are arranged basically in the order of older toward the top (Isozaki et Isozaki & Maruyama 1991).…”

Section: Geologic Structure Of the Japanese Islandsmentioning

confidence: 99%

Regional metamorphic belts of the Japanese Islands

Nakajima

1997

Island Arc

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An overview of the regional metamorphic belts of Japan is given in the context of the tectonic evolution of the Japanese Islands. The Japanese Islands were situated on an active margin of the Eurasian continent or its constituent landmass before their assembly during the Phanerozoic. The Japanese Islands are composed mainly of metamorphosed and unmetamorphosed accretionary complexes, granitoids and their effusive equivalents that were formed by the Cordilleran-type orogeny. The metamorphic belts are regarded essentially as a deep-seated portion of an accretionary complex. In spite of continuous subduction of oceanic plates beneath the continents, these orogenic rocks were formed quite episodically, as evidenced by discontinuous matrix ages of the accretionary complexes and a striking concentration of isotopic ages of the granitoids. A systematic along-arc age shift of Cretaceous large-scaled granitic magmatism and regional metamorphism suggests a tectonic control such as ridge subduction, which triggered the episodic orogeny. A tectonic model based on the paired metamorphic belts, combined with the non-steady tectonic control, works well to explain this magmatism and metamorphism in a single arc-trench system as a continental margin process. However, the juxtapositional process of the paired metamorphic belts is still a problem. Two possible cases, namely transcurrent displacement and back-arc overthrusting are discussed.

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Geological evolution of Japan

Cited by 28 publications

References 117 publications

Subduction Duration and Slab Dip

Subduction Duration and Slab Dip

Recognition of the ‘early’ Sambagawa metamorphism and a schematic cross-section of the Late-Cretaceous Sambagawa subduction zone

Regional metamorphic belts of the Japanese Islands

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