A Global Plate Model Including Lithospheric Deformation Along Major Rifts and Orogens Since the Triassic
A Global Plate Model Including Lithospheric Deformation Along Major Rifts and Orogens Since the Triassic
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DOI：
10.1029/2018tc005462
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发表时间：
2019-06
期刊：
影响因子：
4.2
通讯作者：
R. Müller;S. Zahirovic;Simon Williams;J. Cannon;M. Seton;D. Bower;M. Tetley;C. Heine;E. Le Breton;Shaofeng Liu;Samuel H. J. Russell;Ting Yang;Jonathon Leonard;M. Gurnis
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作者：
R. Müller;S. Zahirovic;Simon Williams;J. Cannon;M. Seton;D. Bower;M. Tetley;C. Heine;E. Le Breton;Shaofeng Liu;Samuel H. J. Russell;Ting Yang;Jonathon Leonard;M. Gurnis
全球深时板块运动模型传统上遵循经典的刚性板块方法，即使已知板块变形是显着的。在这里，我们提出了一个全球性的中新生代变形板块运动模型，捕捉所有大陆边缘的逐步扩展，因为在泛大陆裂谷开始在~240马。该模型还包括主要的失败大陆裂谷和压缩变形沿着碰撞带。根据大量已发表的区域构造模型和相关的地质和地球物理数据，重建了区域变形幕的轮廓和时间。我们重建绝对板块运动的地幔参考框架与联合全球反演热点轨道在过去的8000万年，最大限度地减少全球海沟迁移速度和净岩石圈旋转。在我们的优化模型中，净旋转始终低于0.2°/Myr，海沟迁移分散大大减少。分布的板块变形在晚侏罗世（~160-155 Ma）达到了30 × 106 km 2的中生代峰值，由巨大的裂谷系统网络驱动。在白垩纪中期变形下降之后，在始新世晚期（约35 Ma）达到48 x 106 km 2的高度，这是由板块碰撞的不断增长和新裂谷系统的形成所驱动的。大约三分之一的大陆地壳区域自240 Ma以来发生了变形，大致分为65%的伸展和35%的压缩。这种板块群落模型为建立详细的区域变形板块网络提供了一个框架，并对盆地演化和板块-地幔系统模型形成了约束。
Global deep‐time plate motion models have traditionally followed a classical rigid plate approach, even though plate deformation is known to be significant. Here we present a global Mesozoic–Cenozoic deforming plate motion model that captures the progressive extension of all continental margins since the initiation of rifting within Pangea at ~240 Ma. The model also includes major failed continental rifts and compressional deformation along collision zones. The outlines and timing of regional deformation episodes are reconstructed from a wealth of published regional tectonic models and associated geological and geophysical data. We reconstruct absolute plate motions in a mantle reference frame with a joint global inversion using hot spot tracks for the last 80 million years and minimizing global trench migration velocities and net lithospheric rotation. In our optimized model, net rotation is consistently below 0.2°/Myr, and trench migration scatter is substantially reduced. Distributed plate deformation reaches a Mesozoic peak of 30 × 106 km2 in the Late Jurassic (~160–155 Ma), driven by a vast network of rift systems. After a mid‐Cretaceous drop in deformation, it reaches a high of 48 x 106 km2 in the Late Eocene (~35 Ma), driven by the progressive growth of plate collisions and the formation of new rift systems. About a third of the continental crustal area has been deformed since 240 Ma, partitioned roughly into 65% extension and 35% compression. This community plate model provides a framework for building detailed regional deforming plate networks and form a constraint for models of basin evolution and the plate‐mantle system.