Late quaternary uplift rates of marine terraces on the Pacific coast of North America, southern Oregon to Baja California sur
Late quaternary uplift rates of marine terraces on the Pacific coast of North America, southern Oregon to Baja California sur
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北美太平洋沿岸、俄勒冈州南部至下加利福尼亚州南部海洋阶地的晚第四纪抬升速率
DOI：
10.1016/1040-6182(92)90041-y
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发表时间：
1992
影响因子：
2.2
通讯作者：
G. L. Kennedy
中科院分区：
文献类型：
--
作者：
D. Muhs;T. Rockwell;G. L. Kennedy
海洋阶地是北美太平洋沿岸从俄勒冈州南部到下加利福尼亚南部的沿着常见地貌。我们报告了60个新的海洋阶地珊瑚，水螅珊瑚和其他化石的铀系年龄。代表CA的梯田。80卡和CA。沿着太平洋海岸最常见的是125 ka高的海侵，我们利用这些年龄，沿着阶地海岸线角高程和古海平面估计，计算晚第四纪抬升速率。卡斯卡迪亚俯冲带弧前区的地壳膨胀率为0.45-1.08 m/kyr。再往南，沿着圣安德烈亚斯断层带以西的大部分海岸，抬升速率范围为0.15-0.35 m/kyr，但有些地区的抬升速率明显更高，而其他地区在过去125 ka中明显经历了很少或根本没有抬升。在东太平洋海隆以西的南下加利福尼亚，晚第四纪期间几乎没有发生隆起。平均而言，构造体制的隆升速率大小如下：卡斯卡迪亚俯冲带>圣安德烈亚斯断裂带区域>东太平洋隆起区域。
Marine terraces are common landforms along the Pacific coast of North America from southern Oregon to southern Baja California. We report 60 new uranium-series ages of marine terrace corals, hydrocorals, and other fossils. Terraces representing the ca. 80 ka and ca. 125 ka high stands of sea are the most common along the Pacific coast and we have used these ages, along with terrace shoreline angle elevations and paleo-sea-level estimates, to calculate Late Quaternary uplift rates. Uplift rates in the forearc region of the Cascadia subduction zone range from 0.45–1.08 m/kyr. Farther south, along most of the coast west of the San Andreas fault zone, uplift rates range from 0.15–0.35 m/kyr, but some areas have significantly higher rates of uplift and others have apparently experienced little or no uplift in the last 125 ka. In Baja California Sur, west of the East Pacific Rise, little or no uplift has occurred during the Late Quaternary. On average, the magnitude of rates of uplift for the tectonic regimes is as follows: Cascadia subduction zone > San Andreas fault zone region > East Pacific Rise region.