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	Lithosphere delamination in continental collisional orogens: a systematic numerical study
	Li, Zhong-Hai1; Liu, Mian1,2; Gerya, Taras3
刊名	Journal of geophysical research-solid earth
	2016-07-01
卷号	121期号:7页码:5186-5211
关键词	Lithosphere delamination Continental collision Orogenesis Topography Numerical modeling
ISSN号	2169-9313
DOI	10.1002/2016jb013106
通讯作者	Li, zhong-hai(li.zhonghai@ucas.ac.cn)
英文摘要	Lithosphere delamination is believed to have played a major role in mountain building; however, the mechanism and dynamics of delamination remain poorly understood. using a 2-d high-resolution thermomechanical model, we systematically investigated the conditions for the initiation of lithosphere delamination during orogenesis of continental collision and explored the key factors that control the various modes of delamination. our results indicate that the negative buoyancy from lithosphere thickening during orogenesis could cause delamination, when the reference density of the lithospheric mantle is not lower than that of the asthenosphere. in these cases, compositional rejuvenation of depleted continental lithosphere by magmatic/metasomatic plume- and/or subduction-induced processes may play crucial roles for subsequent lithosphere delamination. if the reference density of the lithospheric mantle is less than that of the asthenosphere, additional promoting factors, such as lower crust eclogitization, are required for delamination. our numerical simulations predict three basic modes of lithosphere delamination: pro-plate delamination, retro-plate delamination, and a transitional double-plates (both the pro-plate and retro-plate) delamination. pro-plate delamination is favored by low convergence rates, high lithospheric density, and relatively strong retro-plate, whereas retro-plate delamination requires a weak retro-plate. the northern apennines and central northern tibetan plateau are possible geological analogs for the pro-plate and retro-plate delamination modes, respectively. our model also shows significant impact of delamination on the topographic evolution of orogens. large-scale lithosphere delamination in continental collision zones would lead to wide and flat plateaus, whereas relatively narrow and steep mountain belts are predicted in orogens without major delamination.
WOS关键词	TIBETAN PLATEAU ; SIERRA-NEVADA ; ALBORAN SEA ; CONVECTIVE INSTABILITY ; SUBDUCTION INITIATION ; NORTHERN APENNINES ; COLORADO PLATEAU ; MANTLE DYNAMICS ; BOUNDARY-LAYER ; EVOLUTION
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000381627500021
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2375110
专题	中国科学院大学
通讯作者	Li, Zhong-Hai
作者单位	1.Univ Chinese Acad Sci, Coll Earth Sci, Key Lab Computat Geodynam, Beijing, Peoples R China 2.Univ Missouri, Dept Geol Sci, Columbia, MO USA 3.Swiss Fed Inst Technol, Inst Geophys, Dept Earth Sci, Zurich, Switzerland
推荐引用方式 GB/T 7714	Li, Zhong-Hai,Liu, Mian,Gerya, Taras. Lithosphere delamination in continental collisional orogens: a systematic numerical study[J]. Journal of geophysical research-solid earth,2016,121(7):5186-5211.
APA	Li, Zhong-Hai,Liu, Mian,&Gerya, Taras.(2016).Lithosphere delamination in continental collisional orogens: a systematic numerical study.Journal of geophysical research-solid earth,121(7),5186-5211.
MLA	Li, Zhong-Hai,et al."Lithosphere delamination in continental collisional orogens: a systematic numerical study".Journal of geophysical research-solid earth 121.7(2016):5186-5211.

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