V‐shaped oceanic propagators are widespread around the world. Their geometry combined with magnetic anomalies associated with their opening shows at the first order that ridge propagation in the third dimension occurs by pulses. In this study we use 3D thermomechanical numerical models to show how oblique kinematic boundary conditions control both the intracontinental rift development and the oceanic ridge propagation. To do so, we apply a shortening velocity boundary condition in the direction perpendicular to the extension for “strong” and “weak” crustal rheologies. Numerical model results highlight the finding that three ridge propagation modes can occur. For low out‐of‐plane velocities (12% to 15% of the extension rate), the ridge propagation is fast (>1.5 cm year⁻¹) and straight. Higher shortening velocities (15% to 17%) lead to a ridge propagation by pulses alternating between fast propagation (~1.5 cm year⁻¹) and stalling phases. Finally, for higher velocities (17% to 20%) a ridge jump propagation mode occurs, localizing a new spreading center between 100 and 200 km far from the initial ridge. We also show that ridge propagation phases are associated with dip‐slip‐dominated deformation, while stalling phases are dominated by strike‐slip deformation. These deformation regimes are marked by structure reorientation, while kinematic boundary conditions remain constant. We discuss these results in terms of plate tectonic reconstructions and regional geological studies.

中文翻译：

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大陆解体和相关斜裂构造的传播方式

V型海洋繁殖器在世界各地广泛分布。它们的几何形状以及与它们的开口相关的磁异常相结合，在一阶显示出在三维中的脊传播是通过脉冲发生的。在这项研究中，我们使用3D热力学数值模型来显示倾斜运动学边界条件如何控制陆内裂谷的发展和洋脊的传播。为此，我们在垂直于“强”和“弱”地壳流变扩展的方向上应用缩短的速度边界条件。数值模型结果突出了可以发生三种脊线传播模式的发现。对于低平面速度（延伸率的12％到15％），山脊传播较快（> 1.5 cm年⁻¹）和笔直。较高的起酥油速度（15％至17％）会导致脉冲在快速传播（〜1.5 cm year ^-1）和失速阶段之间交替变化而导致脊传播。最后，对于更高的速度（17％到20％），会出现山脊跳跃传播模式，将新的扩散中心定位在距初始山脊100至200 km之间。我们还表明，脊的传播阶段与倾滑为主的变形有关，而失速阶段则由走滑变形为主。这些变形状态以结构重新定向为特征，而运动学边界条件保持不变。我们根据板块构造重建和区域地质研究来讨论这些结果。