气候变化领域集成服务门户(CCPortal): Plume -Tree Structure Induced by Low-Viscosity Layers in the Upper Mantle

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DOI	10.1029/2019GL086508
	Plume -Tree Structure Induced by Low-Viscosity Layers in the Upper Mantle
	Liu H.; Leng W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:1
英文摘要	Previous seismological results and geodynamic modeling showed that mantle plumes have thin tails. However, the latest geophysical observations reveal the presence of broad and bifurcate plumes in the lower and upper mantle, providing a new challenge to further understand the evolution of plume morphology. Here, developing 3-D numerical models, we demonstrate that a plume shaped like a tree, derived from the mantle transition zone, branches up to surface volcanoes due to the combined influence of weak layers in the asthenosphere and the mantle transition zone. Clusters of mantle plumes likely explain the simultaneous occurrence of multiple subparallel hot spot tracks in the Pacific and Atlantic Oceans. Meanwhile, the mantle plume wandering at a rate of ~1.5 cm/year in the upper mantle without a strong mantle wind provides a new mechanism for hot spot motions. Thus, our model represents a significant advance for linking plume studies in seismology, geochemistry, and plate reconstruction. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	Forestry; Geodynamics; Morphology; Seismology; Thermal plumes; Trees (mathematics); 3-d numerical models; Geodynamic modeling; Geophysical observations; Hot spot; Mantle plume; Mantle transition zone; Plate reconstruction; plume wandering; Structural geology; asthenosphere; geodynamics; hot spot; mantle plume; numerical model; seismology; three-dimensional modeling; transition zone; upper mantle; viscosity; Atlantic Ocean; Pacific Ocean
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170874
作者单位	Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; CAS Center for Excellence in Comparative Planetology, Beijing, China
推荐引用方式 GB/T 7714	Liu H.,Leng W.. Plume -Tree Structure Induced by Low-Viscosity Layers in the Upper Mantle[J],2020,47(1).
APA	Liu H.,&Leng W..(2020).Plume -Tree Structure Induced by Low-Viscosity Layers in the Upper Mantle.Geophysical Research Letters,47(1).
MLA	Liu H.,et al."Plume -Tree Structure Induced by Low-Viscosity Layers in the Upper Mantle".Geophysical Research Letters 47.1(2020).