Morphodynamic Hierarchy and the Fabric of the Sedimentary Record
Morphodynamic Hierarchy and the Fabric of the Sedimentary Record
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DOI：
10.1029/2020gl087921
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发表时间：
2020-07-28
影响因子：
5.2
通讯作者：
Paola, Chris
中科院分区：
文献类型：
--
作者：
Ganti, Vamsi;Hajek, Elizabeth A.;Paola, Chris
河流地层的低时间完整性可能表明记录的事件代表了不寻常和极端的条件。然而，实地观察表明，保存地层主要记录相对常见的运输条件-一个悖论称为奇怪的平凡的河流地层。我们的理论，河流系统的自组织成一个形态动力学的层次结构，跨越床盆地尺度有利于保存河流地层中的普通事件。使用一个新的概率模型和现有的现场和实验数据集在这些尺度上，我们表明，河流地貌动力学层次结构增强了地层保存的中间地形-普通事件。我们表明，低阶地貌有一个更高的可能性完全保存时，连续的水平在形态动力学层次结构的运动学速率的演变是可比的。我们强调如何相对变化的动力学层次结构中的连续水平的演变的运动学速率可以表现为通过地球历史的地层结构的重大转变。
The low temporal completeness of fluvial strata could indicate that recorded events represent unusual and extreme conditions. However, field observations suggest that preserved strata predominantly record relatively common transport conditions-a paradox termed thestrange ordinarinessof fluvial strata. We theorize that the self-organization of fluvial systems into a morphodynamic hierarchy that spans bed to basin scales facilitates the preservation of ordinary events in fluvial strata. Using a new probabilistic model and existing field and experimental data sets across these scales, we show that fluvial morphodynamic hierarchy enhances the stratigraphic preservation of medial topography-ordinary events. We show that lower-order landforms have a higher likelihood of complete preservation when the kinematic rates of evolution of successive levels in the morphodynamic hierarchy are comparable. We highlight how relative changes in kinematic rates of evolution of successive levels in the morphodynamic hierarchy can manifest as major shifts in stratigraphic architecture through Earth history.