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弄清楚全球背景下的区域地质特征,有利于理解阿拉斯加复杂的地质现象。文章在梳理板块构造理论的基础上,对阿拉斯加区域地质特征进行了分析,指出:太平洋板块密度较大的玄武岩沿着阿留申海沟俯冲到北美洲板块之下,太平洋板块与北美洲板块沿着阿留申海沟的这一地质碰撞带,不但直接促成了中南阿拉斯加大部分的自然地理特征:活跃的火山、大量的地震、粗犷的山脉,而且间接影响了中南阿拉斯加的部分气象特征。
Understanding the regional geological features in a global context is conducive to understanding the complex geological phenomena in Alaska. Based on the tectonic theory of plate tectonics, the paper analyzes the geological characteristics of the Alaskan region, and points out that the basalts with larger density in the Pacific Plate subducted beneath the North American plate along the Aleutian trench, while the Pacific plate and North America plate along Aleutian Plateau. This geological collision zone of Shen Haigou not only directly contributed to most of the natural and geographical features of Central and Southern Alaska, but also indirectly affected some of Alaskan meteorological features in Central and Southern Alaska as a result of active volcanoes, massive earthquakes and rugged mountains.