DOI: 10.1002/2013GL058934
论文题名: Passive margin subduction and the dynamics of collisional orogenesis
作者: Schoettle-Greene P. ; Pysklywec R.N.
刊名: Geophysical Research Letters
ISSN: 0094-10394
EISSN: 1944-10125
出版年: 2014
卷: 41, 期: 3 起始页码: 843
结束页码: 849
语种: 英语
英文关键词: delamination
; passive margin
; Slab Break-off
; subduction
Scopus关键词: Geometry
; Collisional orogenesis
; Continental margin
; Lithospheric delaminations
; Mantle lithosphere
; Numerical experiments
; passive margin
; Slab break-off
; subduction
; Delamination
; collision
; continental margin
; geometry
; lithosphere
; mantle
; numerical model
; subduction zone
英文摘要: Continental passive margins are characterized by a wide variety of geometries and widths. Whether these variations have an influence on subsequent dynamics of orogenesis is unresolved. To investigate, a series of upper mantle numerical experiments were performed with systematically varied continental margin widths and geometries. Results show that the vertical geometry of subducting continental margin crust controls both crustal and mantle lithosphere deformation. On both scales, end-members can be identified. Namely, break-off versus delamination of continental mantle lithosphere and double vergence versus single vergence of crustal thrust fronts form as a direct result of passive margin geometry. We find that the subduction of upper crust to depths >100 km promotes lithospheric delamination and is facilitated by an extended passive margin. Modeled orogens show decreasing upper plate deformation with increasing margin width. These results suggest that along-strike deformational variation within orogens may develop due to precollision passive margin geometry. Key Points Passive margin width and geometry effects collisional orogenesis Blunt margins induce slab break-off and upper plate deformation Wide margins drive lithospheric delamination ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893690611&doi=10.1002%2f2013GL058934&partnerID=40&md5=979458babd9ad00b273805aeffbb3a86
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7658
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth Sciences, University of Toronto, Toronto, ON, Canada
Recommended Citation:
Schoettle-Greene P.,Pysklywec R.N.. Passive margin subduction and the dynamics of collisional orogenesis[J]. Geophysical Research Letters,2014-01-01,41(3).