Journal ArticleDOI
Pervasive low-velocity layer atop the 410-km discontinuity beneath the northwest Pacific subduction zone: Implications for rheology and geodynamics
Guangjie Han,Juan Li,Guangrui Guo,Walter D. Mooney,Shun-ichiro Karato,David A. Yuen,David A. Yuen +6 more
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TLDR
In this paper, regional triplication waveforms of five intermediate-depth events are modeled to simultaneously obtain the compressional (P) and shear (SH) wave velocity structure under the northwestern Pacific subduction zone.About:
This article is published in Earth and Planetary Science Letters.The article was published on 2021-01-15. It has received 25 citations till now. The article focuses on the topics: Transition zone & Subduction.read more
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Seismic imaging of Northwest Pacific and East Asia: New insight into volcanism, seismogenesis and geodynamics
TL;DR: In this article, the authors show that intraplate volcanism in NE Asia is caused by hot and wet upwelling flows in the big mantle wedge above the stagnant Pacific slab in the mantle transition zone.
Melting in the Deep Upper Mantle Oceanward of the Honshu Slab
TL;DR: Obayashi et al. as mentioned in this paper examined the upper mantle and transition zone beneath the western Pacific using multiple ScS reverberations and found that a low-velocity zone (LVZ) is found above the 410-km discontinuity oceanward of the subducting Honshu slab at an average depth of 356 km, with a thickness that ranges from 50 to 75 km assuming the LVZ continues to the 410 km discontinuity.
A finite-frequency P-wave tomographic model: images of subducted slabs stagnant above, penetrating through and trapped below the 660-km discontinuity
Y. Fukao,M. Obayashi +1 more
TL;DR: In this article, a new P wave tomographic model of the mantle was constructed using more than 10 million travel times, and the finite-frequency effect of seismic rays was taken into account by calculating banana-donut kernels at 2'Hz for all first arrival time data, and at 0.1'1''Hz for broadband differential travel time data.
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B–Sr–Nd–Pb isotopic constraints on the origin of the Maoniuping alkaline syenite–carbonatite complex, SW China
Qiang Weng,Wu-Bin Yang,Wu-Bin Yang,He-Cai Niu,He-Cai Niu,Ning-Bo Li,Ning-Bo Li,Pan Qu,Qiang Shan,Qiang Shan,Guo-Qiang Fan,Zhao-Yong Jiang,Ze-Yang Zhang,Ao Li,Xiao-Chen Zhao +14 more
TL;DR: In this paper, the origin of the Maoniuping giant rare earth element deposit was constrained through B-Sr-Nd-Pb isotopic data for fresh/unaltered alkaline syenites.
Journal Article
A sporadic low-velocity layer atop the 410-km discontinuity beneath the Pacific Ocean
S. Shawn Wei,Peter M. Shearer +1 more
TL;DR: In this paper, waveforms of SS precursors recorded by global stations are analyzed to investigate lateral heterogeneities of upper-mantle discontinuities on a global scale.
References
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Postspinel transformations in the system Mg2SiO4‐Fe2SiO4 and some geophysical implications
Eiji Ito,Eiichi Takahashi +1 more
TL;DR: In this article, the phase boundaries between ilmenite-perovskite in MgSiO3 and between Mg2SiO4 spinel and MgO periclase were determined using a uniaxial split-sphere apparatus.
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Subduction factory: 4. Depth-dependent flux of H2O from subducting slabs worldwide
TL;DR: In this article, a global compilation of the thermal structure of subduction zones is used to predict the metamorphic facies and H 2 O content of downgoing slabs.
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Whole-mantle convection and the transition-zone water filter
TL;DR: It is proposed that the transition-zone water-filter model can explain many geochemical observations while avoiding the major pitfalls of invoking isolated mantle reservoirs.
Whole-Mantle Convection and the Transition-Zone Water Filter
TL;DR: In this paper, the authors propose a transition-zone water-filter model to filter out incompatible elements in the Earth's mantle at the 410-km-deep discontinuity, which can explain ocean-island and mid-ocean ridge basalts.
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Inferring upper-mantle temperatures from seismic velocities
TL;DR: In this article, the authors evaluate how well upper-mantle thermal structure can be inferred from seismic velocities, including uncertainties in anharmonic and anelastic parameters for various compositional models.