Scholl D W, Buffington E C, Hopkins D M
Science. 1966 Aug 26;153(3739):992-4. doi: 10.1126/science.153.3739.992.
Profiles of repetitive seismnic reflections reveal that the Bering con tinental slope, outer shelf, and rise overlay an acoustically reflective "basement" which extends at least 750 kilometers parallel to the trend of the slope. This acoustic basement is usually covered by several hundred meters of stratified sediments at the top and bottom of the slope; however, it is exposed in sub marine canyons and flanking spurs along the main part of the slope for a distance of at least 550 kilometers northwest of the Pribilof Islands. The lithologic composition and the age of the rocks of the acoustic basement are not known. However, its probable seismic velocity of 3.1 to 3.7 kilometers per second suggests that it is composed of volcanic rocks or lithified sedimentary rocks or both. The regional geology suggests that the acoustic basement is the upper surface of folded late Mesozoic rocks which were locally intruded by granite and serpentine. The structure of the Bering slope, as deduced from the acoustic profiles, suggests that the surface of the basement has been monoclinically flexed and faulted between the shelf edge and the deep Aleutian Basin.
重复地震反射剖面图显示，白令大陆坡、陆架外缘和海隆覆盖着一个声学反射“基底”，该基底至少延伸750公里，与坡向平行。这个声学基底通常在坡顶和坡底被数百米厚的分层沉积物覆盖；然而，在普里比洛夫群岛西北至少550公里的坡主体沿线的海底峡谷和侧翼支脉中，它是暴露的。声学基底岩石的岩性组成和年龄尚不清楚。然而，其可能的地震速度为每秒3.1至3.7公里，这表明它由火山岩或石化沉积岩或两者组成。区域地质情况表明，声学基底是晚中生代褶皱岩石的上表面，这些岩石局部被花岗岩和蛇纹岩侵入。从声学剖面图推断，白令坡的结构表明基底表面在陆架边缘和阿留申深海盆之间发生了单斜挠曲和断层作用。
