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Origin and dynamics of depositionary subduction margins

机译：沉积俯冲裕度的起源和动力学

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Here we propose a new framework for forearc evolution that focuses on the potential feedbacks between subduction tectonics, sedimentation, and geomorphology that take place during an extreme event of subduction erosion. These feedbacks can lead to the creation of a depositionary forearc, a forearc structure that extends the traditional division of forearcs into accretionary or erosive subduction margins by demonstrating a mode of rapid basin accretion during an erosive event at a subduction margin. A depositionary mode of forearc evolution occurs when terrigenous sediments are deposited directly on the forearc while it is being removed from below by subduction erosion. In the most extreme case, an entire forearc can be removed by a single subduction erosion event followed by depositionary replacement without involving transfer of sediments from the incoming plate. We need to further recognize that subduction forearcs are often shaped by interactions between slow, long-term processes, and sudden extreme events reflecting the sudden influences of large-scale morphological variations in the incoming plate. Both types of processes contribute to the large-scale architecture of the forearc, with extreme events associated with a replacive depositionary mode that rapidly creates sections of a typical forearc margin. The persistent upward diversion of the megathrust is likely to affect its geometry, frictional nature, and hydrogeology. Therefore, the stresses along the fault and individual earthquake rupture characteristics are also expected to be more variable in these erosive systems than in systems with long-lived megathrust surfaces.
机译：在这里，我们提出了一个有关前臂演化的新框架，该框架着重于俯冲侵蚀极端事件中俯冲构造，沉积和地貌之间的潜在反馈。这些反馈可以导致沉积前臂的建立，该前臂结构通过在侵蚀事件中以俯冲裕度的方式演示快速盆地增生的方式，将传统的前臂划分扩展为增生或侵蚀俯冲裕度。当陆源沉积物通过俯冲侵蚀从下方清除时，陆源沉积物直接沉积在前臂上时，就会发生前臂演化的沉积模式。在最极端的情况下，可以通过一次俯冲侵蚀事件将整个前臂移开，然后再进行沉积物置换，而不涉及从进入的板块中转移沉积物。我们需要进一步认识到，俯冲前臂通常由缓慢的长期过程与突然的极端事件之间的相互作用所形成，这些突发事件反映了传入板块中大规模形态变化的突然影响。两种类型的过程都对前臂的大规模结构做出了贡献，极端事件与替换性沉积模式相关联，从而迅速创建了典型的前臂边缘部分。巨大推力的持续向上转移很可能会影响其几何形状，摩擦性质和水文地质。因此，与具有长寿命大推力面的系统相比，在这些侵蚀性系统中，沿断层的应力和单个地震破裂特征也有望发生更大的变化。

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