气候变化领域集成服务门户(CCPortal): Seismic evidence links the subducted Mongol-Okhotsk slab to deformation in D″ near the northeastern margin of the Perm Anomaly

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DOI	10.1016/j.tecto.2019.228297
	Seismic evidence links the subducted Mongol-Okhotsk slab to deformation in D″ near the northeastern margin of the Perm Anomaly
	Tao J.; Hu J.; Jin C.; He X.
发表日期	2020
ISSN	00401951
卷号	774
英文摘要	Numerical simulations have indicated that the Large low-Shear Velocity Provinces (LLSVPs) dynamically interact with subducted slabs in D″, and slabs in turn play an important role in influencing the shape and location of the LLSVPs. In this study, we find evidence for the existence of the D” discontinuity near the northeastern margin of the Perm Anomaly — a smaller LLSVP beneath Eurasia, by analyzing the Scd (the lower mantle triplication) phases generated from two deep events occurring in the northwestern Pacific subduction zone and recorded at stations in Europe and Turkey. The D″ discontinuity in the north is characterized with a +2% velocity increase occurring at a height of 300 km above the core-mantle boundary (CMB), whereas the discontinuity in the south is characterized with a +3% velocity increase occurring at a height of 260 km above the CMB. The D″ discontinuity is most likely attributed to a phase transition from perovskite to post-perovskite in conjunction with the presence of relic slab materials (likely related to the subducted Mongol-Okhotsk slab). Our observations– along with previous seismic anisotropic detections– provide a clue to dynamically link the subducted slab to deformation taking place near the edges of the LLSVP. © 2019 Elsevier B.V.
关键词	LLSVPs Seismic anisotropy The D″ discontinuity The Mongol-Okhotsk slab The Perm Anomaly
英文关键词	Anisotropy; Deformation; Perovskite; Seismology; Core-mantle boundary; Large Low Shear Velocity Provinces (LLSVPs); LLSVPs; Okhotsk; Seismic anisotropy; Seismic evidence; Subduction zones; The Perm Anomaly; Shear flow; deformation; discontinuity; lower mantle; S-wave; seismic anisotropy; slab; subduction zone; wave velocity; Mongol-Okhotsk Fold Belt; Pacific Ocean; Pacific Ocean (Northwest); Perm; Russian Federation
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207887
作者单位	Department of Marine Sciences, Zhejiang University, Zhoushan, 316021, China; Zhejiang Institute of Geology and Mineral Resource, Hangzhou, 310007, China; Department of Geophysics, Yunnan University, Kunming, 650091, China
推荐引用方式 GB/T 7714	Tao J.,Hu J.,Jin C.,等. Seismic evidence links the subducted Mongol-Okhotsk slab to deformation in D″ near the northeastern margin of the Perm Anomaly[J],2020,774.
APA	Tao J.,Hu J.,Jin C.,&He X..(2020).Seismic evidence links the subducted Mongol-Okhotsk slab to deformation in D″ near the northeastern margin of the Perm Anomaly.Tectonophysics,774.
MLA	Tao J.,et al."Seismic evidence links the subducted Mongol-Okhotsk slab to deformation in D″ near the northeastern margin of the Perm Anomaly".Tectonophysics 774(2020).