气候变化领域集成服务门户(CCPortal): S-Velocity Mantle Structure of East Asia From Teleseismic Traveltime Tomography: Inferred Mechanisms for the Cenozoic Intraplate Volcanoes

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DOI	10.1029/2020JB020345
	S-Velocity Mantle Structure of East Asia From Teleseismic Traveltime Tomography: Inferred Mechanisms for the Cenozoic Intraplate Volcanoes
	Kim Y.-W.; Chang S.-J.; Witek M.; Ning J.; Wen J.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	Clusters of Cenozoic volcanoes are found in Korea and Northeast China away from plate boundaries, but the mechanisms responsible for their formation is still unknown. To resolve this issue, we derive an S-wave velocity model of the upper mantle structure beneath East Asia using 131,947 S-wave relative traveltimes from 974 earthquakes recorded at 1,948 seismic stations in China, Korea, Taiwan, and Japan. Our results show that low-velocity anomalies beneath Mt. Baekdu (Changbaishan) and Jeju Island extend to the bottom of the mantle transition zone (MTZ) through slab gaps in the stagnant Pacific slab. On the other hand, low-velocity anomalies beneath the Datong volcanic field are observed to connect to the edge of the stagnant Pacific slab, which may be attributed to subduction-triggered upwelling or deep dehydration from the hydrous MTZ perturbed by subducting slabs. Furthermore, tilted high-velocity anomalies are found all the way down to the MTZ beneath the Great Xing'an Range and the Songliao basin, which may indicate delaminated lithosphere. The intraplate volcanoes north of the Songliao basin, such as the Wudalianchi and Halaha volcanoes, are located just above the delaminated bodies, thereby implying that decompression melting after delamination may be responsible for the intraplate volcanoes. Therefore, the dominant origin of intraplate volcanoes in East Asia may be subduction-related hot upwelling, complemented by shallow origins such as edge-driven convection and lithospheric delamination. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	delamination; East Asia; intraplate volcano; stagnant slab; traveltime tomography
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187318
作者单位	Department of Geophysics, Kangwon National University, Chuncheon, South Korea; School of Earth and Space Sciences, Peking University, Beijing, China
推荐引用方式 GB/T 7714	Kim Y.-W.,Chang S.-J.,Witek M.,et al. S-Velocity Mantle Structure of East Asia From Teleseismic Traveltime Tomography: Inferred Mechanisms for the Cenozoic Intraplate Volcanoes[J],2021,126(3).
APA	Kim Y.-W.,Chang S.-J.,Witek M.,Ning J.,&Wen J..(2021).S-Velocity Mantle Structure of East Asia From Teleseismic Traveltime Tomography: Inferred Mechanisms for the Cenozoic Intraplate Volcanoes.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Kim Y.-W.,et al."S-Velocity Mantle Structure of East Asia From Teleseismic Traveltime Tomography: Inferred Mechanisms for the Cenozoic Intraplate Volcanoes".Journal of Geophysical Research: Solid Earth 126.3(2021).