气候变化领域集成服务门户(CCPortal): 2.5-Dimensional tomography of uppermost mantle beneath Sichuan-Yunnan and surrounding regions

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DOI	10.1016/j.tecto.2013.03.008
	2.5-Dimensional tomography of uppermost mantle beneath Sichuan-Yunnan and surrounding regions
	Lu, Yan; Zhang, Zhongjie; Pei, Shunping; Sandvol, Eric; Xu, Tao; Liang, Xiaofeng
通讯作者	Lu, Y (通讯作者)
发表日期	2014
ISSN	0040-1951
EISSN	1879-3266
起始页码	193
结束页码	204
卷号	627
英文摘要	We examine the Pn and Sn travel time data with long and short epicentral distance ranges separately and obtain 2.5-dimensional tomographic models for the uppermost mantle velocity and the Vp/Vs ratio beneath the Sichuan-Yunnan and adjacent regions. The tomographic models show that the average Vp and Vs of the upper layer are approximately 8.10 km/s and 4.60 km/s and those of the deeper layer are 8.19 km/s and 4.65 km/s, respectively; the average velocity ratio is 1.76 under the study area. A comparison of the Pn and Sn velocity distribution reveals that the high- and low-velocity anomalies are consistent. High velocity and low Vp/Vs ratios exist in the Sichuan Basin and low velocity and high ratios distribute in the Myanmar-Yunnan, Songpan-Ganzi, and Hainan regions, respectively. Our models provide more evidence for the subduction of the Indian plate beneath the Myanmar-Yunnan region and the existence of the hot material upwelling beneath the Hainan region. In our velocity model, there is a significant difference between the southern and the northern parts of the Yunnan region (i.e. north and south of 26 degrees N); we infer that these regions are controlled by different dynamic processes. The velocity distributions at different depths are mainly similar in most of the regions of the study area, and the differences between the upper layer and the deeper layer beneath the Yunnan region indicate that the heat flow from the upper mantle has complex characteristics. (C) 2013 Elsevier B.V. All rights reserved.
关键词	TIBETAN PLATEAU WAVE VELOCITY CRUSTAL DEFORMATION POISSONS RATIO ANISOTROPY CHINA COLLISION LSQR FLOW
英文关键词	Uppermost mantle; Tomography; Velocity; Vp/Vs ratio; Subduction; Hot material
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000339535000018
来源期刊	TECTONOPHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258315
推荐引用方式 GB/T 7714	Lu, Yan,Zhang, Zhongjie,Pei, Shunping,et al. 2.5-Dimensional tomography of uppermost mantle beneath Sichuan-Yunnan and surrounding regions[J]. 中国科学院青藏高原研究所,2014,627.
APA	Lu, Yan,Zhang, Zhongjie,Pei, Shunping,Sandvol, Eric,Xu, Tao,&Liang, Xiaofeng.(2014).2.5-Dimensional tomography of uppermost mantle beneath Sichuan-Yunnan and surrounding regions.TECTONOPHYSICS,627.
MLA	Lu, Yan,et al."2.5-Dimensional tomography of uppermost mantle beneath Sichuan-Yunnan and surrounding regions".TECTONOPHYSICS 627(2014).