DOI: 10.1002/2014GL060075
论文题名: Three-dimensional necking during viscous slab detachment
作者: Von Tscharner M. ; Schmalholz S.M. ; Duretz T.
刊名: Geophysical Research Letters
ISSN: 0094-10602
EISSN: 1944-10333
出版年: 2014
卷: 41, 期: 12 起始页码: 4194
结束页码: 4200
语种: 英语
Scopus关键词: Slab detachment
; deformation
; geodynamics
; seismic tomography
; slab
; three-dimensional modeling
; viscous flow
英文摘要: We study the three-dimensional (3-D) deformation during detachment of a lithospheric slab with simple numerical models using the finite element method. An initially vertical layer of power law viscous fluid mimics the slab and is surrounded by a linear or power law viscous fluid representing asthenospheric mantle. We quantify the impact of slab size and shape (symmetric/asymmetric) on slab detachment and identify two processes that control the lateral (i.e., along-trench) slab deformation: (1) the horizontal deflection of the lateral, vertical slab sides (> 100 km with velocities up to 16 mm/yr) and (2) the propagation of localized thinning (necking) inside the slab (with velocities > 9 cm/yr). The lateral propagation velocity is approximately constant during slab detachment. Larger slabs (here wider than approximately 300 km) detach with rates similar to those predicted by 2-D models, whereas smaller slabs detach slower. Implications for geodynamic processes and interpretations of seismic tomography are discussed. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902916783&doi=10.1002%2f2014GL060075&partnerID=40&md5=d9bd53055103fc09210b47f8130bdc30
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7866
Appears in Collections: 气候减缓与适应
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作者单位: Institut des Sciences de la Terre, Bâtiment Géopolis, Lausanne, Switzerland
Recommended Citation:
Von Tscharner M.,Schmalholz S.M.,Duretz T.. Three-dimensional necking during viscous slab detachment[J]. Geophysical Research Letters,2014-01-01,41(12).