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New results from physical modelling of arc-continent collision in Taiwan: evolutionary model

机译:台湾弧-大陆碰撞物理模型的新结果:演化模型

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Both the analysis of the geological data and the results from 2D and 3D experimental modelling of arc-continent collision in Taiwan reveal the following major stages in this process: (1) failure and thickening of the subducting crust of the Chinese continental margin under the frontal part (accretionary prism) of the Philippine Sea Plate (PSP) since ca, 6-7 Ma: (2) uplift (squeezing) and exhumation of the subducted crustal slice of the Chinese margin and initiation of the Central Range about 5 Ma ago; (3) flexural buckling (subsidence) of the Luzon arc/fore-arc under strong horizontal compression and sedimentary infilling of this area by the material shed from the growing and exhuming Central Range; (4) failure: of the PSP along the west-vergent Longitudinal Valley Fault dipping beneath the are and closure of the fore-arc; (5) subduction reversal and stoppage of continental subduction which has already occurred in northern Taiwan and propagates to the south. The southward propagation of the collision is not stationary. Currently occurring initial collision in southern Taiwan and offshore to the south does not follow the same (described above) evolution as in central and northern Taiwan. The evolution of the collision in time acid space should be considered in the framework of a 3D model where the PSP rupture is preparing in the central and northern Taiwan during a long time, passing through a number of evolutionary stages. Once it has occurred, the rupture (Longitudinal Valley Fault) rapidly propagates to the south into the domain, which did not undergo the pre-rupture evolution. The rupture front is currently located near 21 degrees 30'N. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 51]
机译:台湾的弧-陆碰撞的地质数据分析和2D和3D实验建模的结果都揭示了该过程的以下主要阶段:(1)额叶下中国大陆边缘俯冲壳的破坏和增厚大约在6-7 Ma以来菲律宾海板块(PSP)的一部分(增生棱镜):(2)中国边缘俯冲的地壳切片的抬升(挤压)和掘出以及大约5 Ma之前中部山脉的萌发; (3)吕宋弧/弧前的弯曲屈曲(沉降)在强烈的水平压缩作用下以及由不断增长和发掘出的中央山脉所散发的物质对该区域的沉积填充作用; (4)破坏:PSP沿西缘的纵向谷断层浸入aree并封闭前弧; (5)俯冲逆转和停止的大陆俯冲已经在台湾北部发生并传播到南部。碰撞的向南传播不是平稳的。当前在台湾南部和南部海上发生的初始碰撞没有遵循与台湾中部和北部相同的演变过程(如上所述)。应该在3D模型的框架内考虑在酸空间中碰撞的演变,在3D模型中,PSP破裂在很长一段时间内在台湾中部和北部准备,经历了多个演化阶段。一旦发生,破裂(纵谷断裂)迅速向南传播到该区域,该区域没有经历破裂前的演化。目前,破裂前缘位于21°30'N附近。 (C)2001 Elsevier Science B.V.保留所有权利。 [参考:51]

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