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Stratigraphic signatures of forearc basin formation mechanisms

机译：前臂盆地形成机制的地层签名

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摘要

Tectonic deformation of accretionary wedges is often interpreted using stratigraphic patterns observed in forearc basins. However, similar stratigraphic patterns could evolve from different deformational processes making it difficult to uniquely reconcile stratigraphic patterns and the geodynamic history of natural accretionary wedges. Therefore, it is important to test the dynamic consistency of interpreted deformation histories. One approach is to compare synthetic stratigraphy of forearc basins generated in numerical accretionary wedge models, to the stratal patterns observed in natural fore arcs. We present a simple method to simulate synthetic stratigraphy in numerical accretionary wedge models, comparable to the stratigraphic patterns observed in seismic reflection data. As calibration, we use reflection seismic and borehole data for the Kumano forearc basin in Nankai. We observe that the stratigraphy in retro-forearc basins remains predominantly undisturbed and unaffected by wedge deformation. Sediment-stabilized wedge-top basins in wedges with trenchward surface slope typically form landward of an active out-of-sequence thrust, leading to a landward tilting of the basin. These stratigraphic characteristics are diagnostic of the forearc basin forming mechanism. We also infer that sedimentation in the trench can potentially influence the generation/reactivation of Megasplay Fault activity in the Nankai accretionary wedge. Activity on the Megasplay Fault helps create accommodation space landward to it that leads to the formation of Kumano forearc basin.
机译：使用前臂盆地中观察到的地层图案通常会解释增强楔的构造变形。然而，类似的地层图案可以从不同的变形过程中发展，使得难以唯一地协调地层模式和天然吸收楔的地磁历史。因此，重要的是要测试解释的变形历史的动态一致性。一种方法是比较在数值增生楔模型中产生的前臂盆地的合成层层，到自然前弧中观察到的划分图案。我们提出了一种简单的方法来模拟数控楔形模型中的合成层面，可与地震反射数据中观察到的地层模式相当。作为校准，我们在南开康乃省前臂盆地使用反射地震和钻孔数据。我们观察到复古前臂盆地中的地层仍然是不受干扰的，不受楔形变形的影响。沉积稳定的楔形楔形盆地，楔形楔具有抗挡板表面斜面，通常形成有效异序推力的落地，导致盆地的陆地倾斜。这些地层特性是诊断前臂盆地形成机制的诊断。我们还推断沟槽中的沉降可能会影响南开射击楔形兆的兆腭过滤活动的发电/再活化。 MEGASPLAY故障的活动有助于为其陆地创建住宿空间，从而导致kumano forearc盆地的形成。

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