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

Ohki, Jun'ichi; Shuto, Kenji; Kagami, Hiroo

doi:10.2343/geochemj.28.473

Cited by 45 publications

(20 citation statements)

References 31 publications

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“…Cascades, Grove and Donnelly-Nolan 1986; Central Chile, Frey et al 1984;Japan, Notsu et al 1987), (3) a back-arc basin environment is suggested in some cases by the chemical characteristics range between N-MORB and island-arc types (e.g. Saunders et al 1980;Wood et al 1981), but bimodal associations were produced by, in particular, arc rifting, during the initiation of back-arc spreading (Hochstaedter et al 1990;Ohki et al 1994).…”

Section: Inferred Geological Settingmentioning

confidence: 95%

A mantle- and a lower crust-derived bimodal suite in the Yusufeli (Artvin) area, NE Turkey: trace element and REE evidence for subduction-related rift origin of Early Jurassic Demirkent intrusive complex

Dokuz

Tanyolu

Genç

2005

Int J Earth Sci (Geol Rundsch)

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Section: Inferred Geological Settingmentioning

confidence: 95%

A mantle- and a lower crust-derived bimodal suite in the Yusufeli (Artvin) area, NE Turkey: trace element and REE evidence for subduction-related rift origin of Early Jurassic Demirkent intrusive complex

Dokuz

Tanyolu

Genç

2005

Int J Earth Sci (Geol Rundsch)

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“…In contrast, the amphibolites samples of the Xingzi Group have 143 Nd/ 144 Nd varying from 0.512931 to 0.512954 and ε Nd (t) values ranging from +3.4 to +4.0. Such Nd isotopic compositions are slightly enriched compared with the MORB source, but stronger depleted relative to arc volcanic rocks (e.g., Ohki et al, 1994;Shuto et al, 2006).…”

Section: Geochemistrymentioning

confidence: 98%

Geochronology and geochemistry of volcanic rocks from the Shaojiwa Formation and Xingzi Group, Lushan area, SE China: Implications for Neoproterozoic back-arc basin in the Yangtze Block

Lin

Xing

et al. 2013

Precambrian Research

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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

221

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.

show abstract

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

Cited by 45 publications

References 31 publications

A mantle- and a lower crust-derived bimodal suite in the Yusufeli (Artvin) area, NE Turkey: trace element and REE evidence for subduction-related rift origin of Early Jurassic Demirkent intrusive complex

A mantle- and a lower crust-derived bimodal suite in the Yusufeli (Artvin) area, NE Turkey: trace element and REE evidence for subduction-related rift origin of Early Jurassic Demirkent intrusive complex

Geochronology and geochemistry of volcanic rocks from the Shaojiwa Formation and Xingzi Group, Lushan area, SE China: Implications for Neoproterozoic back-arc basin in the Yangtze Block

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

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