Shifting of the volcanic fronts during Early to Late Miocene in the Northeast Japan arc

Ohki, Jun'ichi; Watanabe, Naoharu; Shuto, Kenji; Itaya, Tetsumaru

doi:10.1111/j.1440-1738.1993.tb00076.x

Cited by 38 publications

(19 citation statements)

References 24 publications

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“…Paleomagnetic evidence suggests anticlockwise rotation of the NE Japan arc (Hamano and Tousha, 1986). Although subalkali magmatism continued, arc volcanism broadened into the forearc with eruption of LAT basalts in the rear arc (Nakajima et al, 1995;Ohki et al, 1994;Ohki et al, 1993;Yoshida et al, 1995). Rear-arc basalts erupted ca.…”

Section: Sea Of Japan Opening Stage (Stage Ii: 17-12 Ma)mentioning

confidence: 99%

Reinitiation of subduction and magmatic responses in SW Japan during Neogene time

Kimura

Stern

Yoshida

2005

Geol Soc America Bull

222

266

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Southwestern Japan during Paleogene time was affected by subduction of the Kula and Pacifi c plates beneath the eastern margin of Eurasia, followed by a brief episode of transform faulting to allow the Shikoku Basin to open at 27-15 Ma. Subsequent opening of the Japan Sea back-arc basin in middle Miocene time broke Japan away from Eurasia, and SW Japan rotated clockwise ~45º as it drifted south (17-15 Ma). Southward drift required subduction of the Philippine Sea plate beneath SW Japan, leading to the formation of a magmatic arc. Subduction of the hot Shikoku Basin lithosphere and spreading ridge resulted in distinctive volcanism in the SW Japan forearc between 17 and 12 Ma. This volcanism included midoceanic-ridge basalt (MORB)-like intrusions and oceanic-island basalt (OIB)-type alkali basalts, felsic plutons in the accretionary prism, and high-magnesium andesites along the Setouchi forearc basin. Mafi c magmas in the outermost forearc originated from the subducted Shikoku Basin spreading ridge, whereas Setouchi high-magnesium andesites (HMA) may have resulted from the interaction of melts of the subducted Philippine Sea plate with the overlying mantle. Felsic magmas in the forearc resulted from melting of Shimanto Belt sediments caused by intrusion of HMA magmas. Persistent rear-arc volcanism was caused by upwelling asthenosphere associated with opening of the Sea of Japan. Rear-arc volcanism began ca. 25 Ma as rift-fi ll low-alkali tholeiite volca-nism and was replaced gradually after 12 Ma by alkali basalt volcanism. Upwelling-related alkali volcanism continues up to the present, whereas forearc volcanism ceased at 12 Ma.The volcanic arc narrowed with time as the Philippine Sea slab descended and slowly cooled. Adakitic dacites erupted after 1.7 Ma above the 100-km-depth contour of the subducted Philippine Sea plate, suggesting that melting resulted from interaction of the slab with upwelling asthenosphere. Interactions between upwelled rear-arc asthenosphere and subduction of the hot Philippine Sea slab appear to have been the main controls of magmatism for the Neogene SW Japan arc.

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Section: Sea Of Japan Opening Stage (Stage Ii: 17-12 Ma)mentioning

confidence: 99%

Reinitiation of subduction and magmatic responses in SW Japan during Neogene time

Kimura

Stern

Yoshida

2005

Geol Soc America Bull

222

266

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“…This may imply that the volcanic front shifted twice. Ohki et al (1993) attributed the first shift, from the 25-22 Ma line to the 16-13 Ma line, in terms of counter-clockwise rotation of the NE Japan arc at 20-12 Ma (Otofuji et al, 1985). The second shift, from the 16-13 Ma to the 8-0 Ma line, they attributed to a decrease in the angle of dip of the Pacific plate which subducted beneath the NE Japan arc at 13-8 Ma.…”

Section: Geologic and Petrologic Backgroundmentioning

confidence: 99%

“…However, radiometric ages of 17-19 Ma have been reported for basaltic rocks from some localities in the back-arc side of the NE Japan arc (e.g., Koshimizu et al, 1986;Kimura, 1985), in dicating the existence of some weak back-arc side volcanism. Ohki et al ., 1993). Boundaries between trench side, transitional zone and back-arc side are referred to those in Fig .…”

Section: Geologic and Petrologic Backgroundmentioning

confidence: 99%

Middle Miocene bimodal volcanism by asthenospheric upwelling: Sr and Nd isotopic evidence from the back-arc region of the Northeast Japan arc.

1994

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“…9a). These reflect the changes in allocation of the arc-trench system before and after the opening of the Japan Sea; the latter was NE-SW (oblique to the present NE Japan arc) before the opening, and NNE-SSW (parallel to the present NE Japan arc) after the opening until the present (Otufuji et al 1985;Ohki et al 1993;Yoshida et al 1999b). The present-day mantle structure, including the low velocity and mantle anisotropy structures Nakajima et al 2006b), is principally parallel to the present arc-trench system, although there are some mantle heterogeneities in the areas of SW Honshu and NE Honshu bordered by the TTL.…”

Section: Role Of the Heterogeneous Lower Crustmentioning

confidence: 99%

“…The Sekiryo volcanic zone is an axial zone of arc volcanism, in which the temperature of andesitic magmas is the highest and the eruptive materials are the most voluminous (Fig. 18d, Ohguchi et al 1989;Ohki et al 1993;Yoshida et al 1999b), superimposed on S-wave velocity perturbations along the inclined low-velocity zone in the mantle wedge of the NE Japan arc after Yoshida et al (2005). (c) Schematic isobaric phase diagram at a pressure of about 5 kb (Sakuyama 1979), and differentiation courses of the Quaternary low-K tholeiite (Kuritani et al 2013) and calc-alkaline andesites (modified from Yoshida et al 2005).…”

Section: Along-arc Mantle Heterogeneitymentioning

confidence: 99%

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

et al. 2013

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Abstract:We review the evolution of late Cenozoic magmatism in the NE Japan arc, and examine the relationship between the magmatism and the crust-mantle structure. Recent studies reveal secular changes in the mode of magmatic activity, the magma plumbing system, erupted volumes and magmatic composition associated with the evolution of crust-mantle structures related to the tectonic evolution of the arc. The evolution of Cenozoic magmatism in the arc can be divided into three periods: the continental margin (66-21 Ma), the back-arc basin (21-13.5 Ma) and the island-arc period (13.5-0 Ma). Magmatic evolution in the back-arc basin and the island-arc periods appears to be related to the 2D to 3D change in the convection pattern of the mantle wedge related to the asthenosphere upwelling and subsequent cooling of the mantle. Geodynamic changes in the mantle caused back-arc basin basalt eruptions during the back-arc basin opening (basalt phase) followed by crustal heating and re-melting, which generated many felsic plutons and calderas (rhyolite/granite phase) in the early stage of the island-arc period. This was followed by crustal cooling and strong compression, which ensured vent connections and mixing between deeper mafic and shallower felsic magmas, erupting large volumes of Quaternary andesites (andesite phase).Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.The NE Japan arc is a typical island arc associated with a cold subduction zone. It is one of the most well-known island arcs on Earth and provides a useful model for our understanding of how subduction zones produce magmas, including andesites. The NE Japan arc is related to the westward

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Shifting of the volcanic fronts during Early to Late Miocene in the Northeast Japan arc

Cited by 38 publications

References 24 publications

Reinitiation of subduction and magmatic responses in SW Japan during Neogene time

Reinitiation of subduction and magmatic responses in SW Japan during Neogene time

Middle Miocene bimodal volcanism by asthenospheric upwelling: Sr and Nd isotopic evidence from the back-arc region of the Northeast Japan arc.

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

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