Interplay between dynamic topography and flexure along the U.S. Atlantic passive margin: Insights from landscape evolution modeling
Interplay between dynamic topography and flexure along the U.S. Atlantic passive margin: Insights from landscape evolution modeling
复制标题
美国大西洋被动边缘动态地形与弯曲之间的相互作用：景观演化模型的见解
DOI：
10.1016/j.gloplacha.2017.01.004
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发表时间：
2016
影响因子：
3.9
通讯作者：
G. Ruetenik
中科院分区：
文献类型：
--
作者：
R. Moucha;G. Ruetenik
地幔对流的全球时间向后模型导致了对美国大西洋被动边缘动态地形瞬态的截然不同的解释（Moucha等人，2008年; Spasojević等人，2008;罗利等人，2013; Rovere等人，2015）。然而，调和这些地球动力学模型与观察到的近海沉积记录直接是复杂的，因为沉积记录集成了气候，海平面，岩性和构造的变化。为了规避这一点，我们转而专注于对奥兰治堡悬崖的观测变形进行建模，奥兰治堡悬崖是一条有据可查的350万年前的上新世中期海岸线（例如，Rovere等人，2015）。在这里，我们提出了一个新的景观演变模型的结果，并证明了弯曲效应沿着这一边缘是可比的动态地形的变化（罗利等人，2013年），并要求充分解释变形的奥兰治堡悬崖。此外，使用奥兰治堡陡崖作为基准受冰川均衡调整，我们表明，15米的上新世中期海平面以上的今天是最一致的散布沿海平原沉积和地表变形来自地幔对流和弯曲，等值线。
Global backwards-in time models of mantle convection have resulted in vastly different interpretations of the transient state of dynamic topography on the U.S. Atlantic passive margin (Moucha et al., 2008; Spasojević et al., 2008; Rowley et al., 2013; Rovere et al., 2015). However, reconciling these geodynamic models with the observed offshore sedimentary record directly is complex because the sedimentary record integrates changes in climate, sea level, lithology, and tectonics. To circumvent this, we instead focus on modeling the observed deformation of the Orangeburg scarp, a well-documented 3.5 million year old mid-Pliocene shoreline (e.g. Rovere et al., 2015). Herein, we present results from a new landscape evolution model and demonstrate that flexural effects along this margin are comparable to changes in dynamic topography (Rowley et al., 2013) and are required to fully explain deformation of the Orangeburg scarp. Moreover, using the Orangeburg scarp as a datum subject to glacial isostatic adjustment, we demonstrate that a 15 m mid-Pliocene sea level above present-day is most consistent with interspersed coastal plain sediment and surface deformation derived from mantle convection and flexural-isostasy.