气候变化领域集成服务门户(CCPortal): Evolution of subduction dip angles and seismic stress patterns during arc-continent collision: Modeling Mindoro Island

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DOI	10.1016/j.epsl.2019.116054
	Evolution of subduction dip angles and seismic stress patterns during arc-continent collision: Modeling Mindoro Island
	Bina C.R.; Čížková H.; Chen P.-F.
发表日期	2020
ISSN	0012821X
卷号	533
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202491
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
推荐引用方式 GB/T 7714	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],2020,533.
APA	Bina C.R.,Čížková H.,&Chen P.-F..(2020).Evolution of subduction dip angles and seismic stress patterns during arc-continent collision: Modeling Mindoro Island.Earth and Planetary Science Letters,533.
MLA	Bina C.R.,et al."Evolution of subduction dip angles and seismic stress patterns during arc-continent collision: Modeling Mindoro Island".Earth and Planetary Science Letters 533(2020).