Estimating the Age of Near-Shore Carbonate Slides Using Coral Reefs and Erosional Markers: A Case Study from Curacao, Netherlands Antilles
Estimating the Age of Near-Shore Carbonate Slides Using Coral Reefs and Erosional Markers: A Case Study from Curacao, Netherlands Antilles
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使用珊瑚礁和侵蚀标记估算近岸碳酸盐岩滑坡的年龄：荷属安的列斯群岛库拉索岛的案例研究
DOI：
10.2110/sedred.2010.1.4
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发表时间：
2010
影响因子：
4.6
通讯作者：
J. Pickle
中科院分区：
文献类型：
--
作者：
M. Hornbach;P. Mann;F. Taylor;S. W. Bowen;J. Pickle
碳酸盐岩质量故障是普遍存在的，特别是沿着陡峭的热带海岸线，然而，这些故障的年龄，频率和原因往往约束不足。随着人类对海岸线的不断开发，了解碳酸盐岩边坡何时发生破坏变得越来越重要。使用陆地和海洋为基础的观测，我们提出的方法，使有价值的一阶年龄估计的近岸边坡故障。作为一个案例研究，我们分析了部分淹没低碳酸盐梯田沿着南部海岸线的库拉考，荷属安的列斯群岛。这个梯田坐落在附近的一个记录良好的碳酸盐边坡故障。我们的海陆结合研究限制了滑坡接触，滑坡后珊瑚礁生长的数量，以及侵蚀海岸线缺口的位置。根据这些观察，我们对边坡破坏的时间进行了限制，并得出结论，加拉加斯湾滑坡不是最近发生的（在最近~3000年内），但更有可能是至少~ 116，000年前，接近末次间冰期海平面高位的末期。斜坡破坏可能发生在沿着不整合接触面，该接触面将海岸石灰岩基底与下伏白垩纪玄武岩分开，可能是由加勒比海-南美洲板块边界沿着的大地震引发的。
Carbonate mass failures are widespread, particularly along steep tropical shorelines, however, the age, frequency, and cause of these failures are often poorly constrained. As shorelines undergo intensive human development, understanding when carbonate slopes failure occur is becoming increasingly important. Using both land and marine-based observations, we present methods for making valuable first-order age estimates of near-shore slope failures. As a case study, we analyze the partially submerged lower carbonate terrace along the southern shoreline of Curacao, Netherlands Antilles.This terrace sits adjacent to a well-documented carbonate slope failure. Our combined land-sea study constrains the slide contact, the amount of post-slide coral reef growth, and the location of erosional shoreline notches. From these observations, we place limits on the timing of slope failure, and conclude that the Caracas Bay slide did not occur recently (within the last ~3000 years) but more likely at least ~116,000 years ago, near the end of the last interglacial sea level high stand. Slope failure likely occurred along the unconformable contact separating the base of the coastal limestone with underlying Cretaceous basalt, and may have been triggered by a large earthquake along the Caribbean-South American plate boundary.