DOI: 10.1016/j.epsl.2019.116054
论文题名: Evolution of subduction dip angles and seismic stress patterns during arc-continent collision: Modeling Mindoro Island
作者: Bina C.R. ; Čížková H. ; Chen P.-F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 533 语种: 英语
中文关键词: arc-continent collision
; Manila trench
; mantle transition zone
; seismic stress fields
; subduction dynamics
; trench migration
英文关键词: Buoyancy
; Gasoline
; Locks (fasteners)
; Petrology
; Shear stress
; Arc-continent collision
; Manila Trench
; Mantle transition zone
; Seismic stress
; Subduction dynamics
; Seismology
; arc-continent collision
; mantle source
; stress field
; subduction
; tectonic evolution
; transition zone
; trench
; Mindoro
; Philippines
英文摘要: Here we dynamically model the temporal development of arc-continent collision, with particular attention to the evolution of slab dip angles and stress fields during approach to collisional locking (suturing). Our modeling is based on a simplified representation of Mindoro Island and the southern Manila Trench, which provide a natural laboratory in that convergence is ongoing to the north but collision is complete in the south, so that distance of 2D slices along the arc may serve as a reasonable proxy for time. We consider in detail the effects of the negative petrological buoyancy imparted to the slab upon encountering the thermally uplifted “410-km” (wadsleyite-forming) phase transition, as well as the effects of initial separation distance between the incoming Palawan continental fragment and the overriding Philippine Mobile Belt assemblage of arc-continent terranes. Despite simplifications in representing this tectonically complex region, our model reproduces important seismic observations, including the progressive steepening of slab dip and the growth of down-dip extensional stresses during the progress of collision. It also reveals that a significant contribution (of order 100 MPa) to the maximum attainable down-dip extensional stress arises from the negative petrological buoyancy of the uplifted “410-km” transition, and it illuminates how the initial separation of arc-continent fragments controls the temporal offset between collisional locking and the onset of negative petrological buoyancy. Finally, associated calculations of maximum shear stress may offer a partial explanation for the aseismic nature of tomographically proposed slab extensions below the Wadati-Benioff zone. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164869
Appears in Collections: 气候变化与战略
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作者单位: Dept. of Earth and Planetary Sciences, Northwestern University, Evanston, IL, United States; Dept. of Geophysics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic; Dept. of Earth Sciences, National Central University, Taoyuan, Taiwan
Recommended Citation:
Bina C.R.,Čížková H.,Chen P.-F.. Evolution of subduction dip angles and seismic stress patterns during arc-continent collision: Modeling Mindoro Island[J]. Earth and Planetary Science Letters,2020-01-01,533