Crustal strength in central Tibet determined from Holocene shoreline deflection around Siling Co

doi:10.1016/j.epsl.2015.05.002

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	Crustal strength in central Tibet determined from Holocene shoreline deflection around Siling Co
	Shi, Xuhua 1,2; Kirby, Eric 3; Furlong, Kevin P.1; Meng, Kai 4; Robinson, Ruth 5; Wang, Erchie 4
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2015-08-01
卷号	423 页码:145-154
关键词	crustal strength Tibetan Plateau lake shoreline effective elastic thickness viscosity
DOI	10.1016/j.epsl.2015.05.002
文献子类	Article
英文摘要	Controversial end member models for the growth and evolution of the Tibetan Plateau demand quantitative constraints of the lithospheric rheology. Direct determinations of bulk crustal rheology, however, remain relatively sparse. Here we use the flexural rebound of lacustrine shorelines developed during the Lingtong highstand around Siling Co, in central Tibet, to place bounds on the effective elastic thickness (T-e) and viscosity of Tibetan crust. Shoreline features associated with the Lingtong highstand complex similar to 60 m above present lake level are deflected from horizontal by 2-4 m over wavelengths of similar to 200 km. Optically stimulated luminescence dating of aggradational shoreline deposits indicates that these lake levels were reached at 6-4 ka. Assuming that surface loads were entirely supported by an elastic layer overlying an inviscid fluid, the range and spatial distribution of variations in shoreline elevation are consistent with deflections predicted by a uniform elastic plate with thickness, T-e of 20-30 km. If viscoelastic relaxation in response to lake withdrawal is complete, our data suggest an average viscosity <= 10(19) Pa s. These results imply that the apparent viscosity of the lower crust inferred over millennial timescales is comparable with that estimated from post-seismic relaxation over decadal timescale. Published by Elsevier B.V.
WOS关键词	ASIA COLLISION ZONE ; EARTHQUAKE-CYCLE DEFORMATION ; SOUTHERN TIBET ; UPPER-MANTLE ; POSTSEISMIC DEFORMATION ; PARTIALLY MOLTEN ; LAKE BONNEVILLE ; EASTERN MARGIN ; FINITE STRAIN ; MIDDLE CRUST
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000356117000014
资助机构	National Science Foundation(EAR-0911587) ; National Science Foundation(EAR-0911587) ; Chinese Academy of Sciences(XDB03010500) ; Chinese Academy of Sciences(XDB03010500) ; National Science Foundation(EAR-0911587) ; National Science Foundation(EAR-0911587) ; Chinese Academy of Sciences(XDB03010500) ; Chinese Academy of Sciences(XDB03010500)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62516]
专题	地质与地球物理研究所_特提斯研究中心
作者单位	1.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA 2.Nanyang Technol Univ, Earth Observ Singapore, Singapore 639798, Singapore 3.Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 5.Univ St Andrews, Dept Earth & Environm Sci, St Andrews KY16 9AL, Fife, Scotland
推荐引用方式 GB/T 7714	Shi, Xuhua,Kirby, Eric,Furlong, Kevin P.,et al. Crustal strength in central Tibet determined from Holocene shoreline deflection around Siling Co[J]. EARTH AND PLANETARY SCIENCE LETTERS,2015,423:145-154.
APA	Shi, Xuhua,Kirby, Eric,Furlong, Kevin P.,Meng, Kai,Robinson, Ruth,&Wang, Erchie.(2015).Crustal strength in central Tibet determined from Holocene shoreline deflection around Siling Co.EARTH AND PLANETARY SCIENCE LETTERS,423,145-154.
MLA	Shi, Xuhua,et al."Crustal strength in central Tibet determined from Holocene shoreline deflection around Siling Co".EARTH AND PLANETARY SCIENCE LETTERS 423(2015):145-154.