气候变化领域集成服务门户(CCPortal): Structure of the crust and upper mantle beneath the southeastern Tibetan Plateau by P and S receiver functions

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DOI	10.3969/j.issn.0001-5733.2009.12.009
	Structure of the crust and upper mantle beneath the southeastern Tibetan Plateau by P and S receiver functions
	Xu Qiang; Zhao Jun-meng; Cui Zhong-xiong; Liu Ming-qian
通讯作者	Xu, Q (通讯作者)
发表日期	2009
ISSN	0001-5733
起始页码	3001
结束页码	3008
卷号	52 期号:12
英文摘要	Combined P and S receiver functions from seismograms of teleseismic events recorded at 25 temporary broadband seismic stations in the southeastern Tibetan Plateau are used to map the Moho depth, Poisson's ratio and the thickness of the mantle transition zone. The main results are as follows: (1) The crustal thickness gradually decrease from similar to 60 km in Songpan-Ganze terrane and Qiangtang Terrane to similar to 38 km in Indochina block and similar to 42 km in Yangtze block. (2) The Poisson's ratios in Qiangtang terrane mainly range from 0.25 to 0.28, which indicate that the crust is mainly composed of intermediate and mafic rocks and may be caused by the increased mafic rocks in lower crust. But the Poisson's ratios range from 0.25 to 0.26 in Songpan-Ganze terrane, Indochina block and Yangtze block, which indicate that the crust is predominantly felsic and intermediate rocks. The lack of consistent high Poisson's ratio (>= 0.30) shows that widespread partial melt does not exist within the curst, but does not exclude the presence of local partial melt. (3) There is an obvious thickened zone of the mantle transition zone compared with IASP91 standard value which varies from 10 km to 26 km in Qiangtang terrane. The anomaly suggests that the temperature is about 100 degrees C to 260 degrees C lower than global average value within the mantle transition zone, and it may be attributed to the presence of a subducted slab within the mantle transition zone.
关键词	SUBDUCTION CHINA
英文关键词	P wave receiver function; S wave receiver function; Mantle transition zone; Poisson's ratio
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000273364200009
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
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/257644
推荐引用方式 GB/T 7714	Xu Qiang,Zhao Jun-meng,Cui Zhong-xiong,et al. Structure of the crust and upper mantle beneath the southeastern Tibetan Plateau by P and S receiver functions[J]. 中国科学院青藏高原研究所,2009,52(12).
APA	Xu Qiang,Zhao Jun-meng,Cui Zhong-xiong,&Liu Ming-qian.(2009).Structure of the crust and upper mantle beneath the southeastern Tibetan Plateau by P and S receiver functions.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,52(12).
MLA	Xu Qiang,et al."Structure of the crust and upper mantle beneath the southeastern Tibetan Plateau by P and S receiver functions".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 52.12(2009).