Abstract The kinematic evolution of the West Iberian margin during the opening of the southern North Atlantic has been of interest for several decades and provides a well-constrained environment to study and develop new concepts related to the formation of non-volcanic (magma poor) passive margins. Building upon previous rigid and deformable plate tectonic modelling studies, the aim of this work is to create deformable plate tectonic models of the West Iberian margin using previously published constraints in GPlates to investigate the role of the Galicia Bank as an independent continental ribbon during deformation of the West Iberian margin from 200 Ma to present day. A comparison of present day crustal thickness results calculated from deformable plate tectonic reconstructions with those obtained from gravity inversion has allowed the plate kinematics of the Galicia Bank relative to the Flemish Cap to be investigated. Additionally, this comparison provided detailed insights into the most probable kinematic scenarios for the Galicia Bank continental ribbon, including its impact on the deformation experienced within the Galicia Interior Basin. Two preferred kinematic models for the Galicia Bank are proposed. One that implies synchronous motion with the Flemish Cap until ~160 Ma after which the Galicia Bank begins to move southward, causing crustal thinning within the Galicia Interior Basin. The other preferred model, despite its discrepancies with gravity inversion results, implies synchronous motion of the Galicia Bank and southeastern Flemish Cap until breakup between the southeastern Newfoundland and Iberian margins initiating ~140 Ma. In addition to the deformation induced by the motion of the Galicia Bank, this study demonstrates the influence of inherited Variscan structures and their impact on rift segmentation experienced within the Galicia Interior Basin. This is inferred through attempts to discretize triangular meshes within regions of deformation in areas where inherited structures have been previously interpreted.

中文翻译：

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使用可变形板块构造模型研究加利西亚河岸对伊比利亚西北部边缘形成的作用

摘要 几十年来，北大西洋南部开放期间西伊比利亚边缘的运动演化一直备受关注，并为研究和开发与非火山（岩浆贫乏）被动形成相关的新概念提供了良好的约束环境。边距。在先前刚性和可变形板块构造建模研究的基础上，这项工作的目的是创建西伊比利亚边缘的可变形板块构造模型，使用先前在 Gplates 中发布的约束来研究加利西亚海岸在变形过程中作为独立大陆带的作用。西伊比利亚边缘从 200 Ma 到现在。将通过可变形板块构造重建计算出的当今地壳厚度结果与通过重力反演获得的结果进行比较，可以研究加利西亚海岸相对于佛兰芒盖的板块运动学。此外，这种比较提供了对加利西亚银行大陆带最可能的运动学情景的详细见解，包括其对加利西亚内陆盆地内经历的变形的影响。为加利西亚银行提出了两个优选的运动学模型。一个意味着与佛兰芒盖帽同步运动，直到约 160 Ma，之后加利西亚海岸开始向南移动，导致加利西亚内陆盆地的地壳变薄。另一个首选模型，尽管它与重力反演结果存在差异，意味着加利西亚河岸和佛兰芒帽东南部的同步运动，直到纽芬兰东南部和伊比利亚边缘之间的分裂开始~140 Ma。除了由加利西亚海岸运动引起的变形之外，这项研究还证明了继承的瓦利斯坎结构的影响及其对加利西亚内部盆地内经历的裂谷分割的影响。这是通过尝试在先前已解释继承结构的区域中的变形区域内离散三角形网格来推断的。这项研究证明了继承的 Variscan 结构的影响及其对加利西亚内部盆地内经历的裂谷分割的影响。这是通过尝试在先前已解释继承结构的区域中的变形区域内离散三角形网格来推断的。这项研究证明了继承的 Variscan 结构的影响及其对加利西亚内部盆地内经历的裂谷分割的影响。这是通过尝试在先前已解释继承结构的区域中的变形区域内离散三角形网格来推断的。