Department of the Geophysical Sciences, 5734 South Ellis Avenue, The University of Chicago, Chicago, IL 60637, USA.
Science. 2013 Jun 28;340(6140):1560-3. doi: 10.1126/science.1229180. Epub 2013 May 16.
Sedimentary rocks from Virginia through Florida record marine flooding during the mid-Pliocene. Several wave-cut scarps that at the time of deposition would have been horizontal are now draped over a warped surface with a maximum variation of 60 meters. We modeled dynamic topography by using mantle convection simulations that predict the amplitude and broad spatial distribution of this distortion. The results imply that dynamic topography and, to a lesser extent, glacial isostatic adjustment account for the current architecture of the coastal plain and proximal shelf. This confounds attempts to use regional stratigraphic relations as references for longer-term sea-level determinations. Inferences of Pliocene global sea-level heights or stability of Antarctic ice sheets therefore cannot be deciphered in the absence of an appropriate mantle dynamic reference frame.
弗吉尼亚州到佛罗里达州的沉积岩记录了中新世中期的海洋泛滥。当时为水平状态的几个海蚀崖现在覆盖在一个扭曲的表面上，最大变化达 60 米。我们通过使用地幔对流模拟来模拟动态地形，这些模拟预测了这种变形的幅度和广泛的空间分布。结果表明，动态地形，以及在较小程度上的冰川均衡调整，解释了沿海平原和近岸架的当前构造。这使得尝试将区域地层关系用作长期海平面确定的参考变得复杂。因此，如果没有适当的地幔动力参考框架，就无法解读中新世全球海平面高度或南极冰盖稳定性的推断。
