Decarbonation of Stagnant Slab in the Mantle Transition Zone

2020 ◽  
Vol 125 (7) ◽  
Author(s):  
Yanfei Zhang ◽  
Chao Wang ◽  
Zhenmin Jin
Keyword(s):  
Transition Zone ◽  
Mantle Transition Zone ◽  
Stagnant Slab

Mantle transition zone, stagnant slab and intraplate volcanism in Northeast Asia

2017 ◽  
pp. ggw491 ◽  
Author(s):  
Chuanxu Chen ◽  
Dapeng Zhao ◽  
You Tian ◽  
Shiguo Wu ◽  
Akira Hasegawa ◽  
...  
Keyword(s):  
Transition Zone ◽  
Northeast Asia ◽  
Mantle Transition Zone ◽  
Intraplate Volcanism ◽  
Stagnant Slab

scholarly journals Interrelation of the stagnant slab, Ontong Java Plateau, and intraplate volcanism as inferred from seismic tomography

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Masayuki Obayashi ◽  
Junko Yoshimitsu ◽  
Daisuke Suetsugu ◽  
Hajime Shiobara ◽  
Hiroko Sugioka ◽  
...  
Keyword(s):  
Transition Zone ◽  
Subduction Zones ◽  
Middle Eastern ◽  
P Wave ◽  
Ontong Java Plateau ◽  
Mantle Transition Zone ◽  
Slab Breakoff ◽  
Pacific Slab ◽  
Velocity Anomalies ◽  
Stagnant Slab

AbstractWe investigated the seismological structure beneath the equatorial Melanesian region, where is tectonically unique because an immense oceanic plateau, a volcanic chain and subduction zones meet. We conducted a multi-frequency P-wave tomography using data collected from an approximately 2-year-long seismic experiment around the Ontong Java Plateau (OJP). High-velocity anomalies were revealed beneath the center of the OJP at a depth of ~ 150 km, the middle-eastern edge of the OJP at depths of 200–300 km, and in the mantle transition zone beneath and around the OJP; low-velocity anomalies were observed along the Caroline volcanic island chain above 450 km depth. These anomalies are considered to be associated with the thick lithosphere of the OJP, remnant dipping Pacific slab, stagnant Pacific slab, and a sheet-like upwelling. The broad stagnant slab was formed due to rapid trench retreat from 48 to 25 Ma until when the OJP with thick lithosphere collided with a subduction boundary of the Pacific and Australian plates. This collision triggered slab breakoff beneath the arc where the dipping slab remained. The stagnant Pacific slab in the mantle transition zone restricted the plume upwelling from the lower mantle causing sheet-like deformed upwelling in the upper mantle.

Melting of dehydrated oceanic crust from the stagnant slab and of the hydrated mantle transition zone: Constraints from Cenozoic alkaline basalts in eastern China

2013 ◽  
Vol 359 ◽  
pp. 32-48 ◽  
Author(s):  
Tetsuya Sakuyama ◽  
Wei Tian ◽  
Jun-Ichi Kimura ◽  
Yoshio Fukao ◽  
Yuka Hirahara ◽  
...  
Keyword(s):  
Transition Zone ◽  
Oceanic Crust ◽  
Eastern China ◽  
Mantle Transition Zone ◽  
Stagnant Slab
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