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四月间,中国地质学会北京市分会大地构造组举行了1962年度第一次学术讨论会。会上对大地构造学若干主要理论问题和我国当前大地构造研究动向与研究方法,进行了广泛的讨论。(一)大西洋和太平洋的构造特征从现有资料看来,大西洋和太平洋的地质构造性质是截然不同的。太平洋是巨大的原生的地壳构造单元,其间矽铝层很薄或缺失,地壳厚度也不大;环绕着它的四周有中、新生代褶皱山脉和其西部边缘特有的岛弧;有安山岩线和与其相伴随的深海沟,是个强烈地震和新构造活动区。而大西洋作
In April, the Geological Society of China, Beijing Branch of the Geotechnical Organization held its first academic symposium in 1962. At the meeting on the tectonics of a number of major theoretical issues and China’s current tectonic research trends and research methods, conducted a wide range of discussions. (I) Tectonic features of the Atlantic and Pacific Ocean From the available information, the nature of the geological structure of the Atlantic Ocean and the Pacific Ocean is quite different. The Pacific Ocean is a huge native crustal tectonic unit with very thin or absent Si-Al layers and a small crustal thickness. Mesozoic-Cenozoic fold mountains surround it and its island arc is characteristic of its western edge. There are andesite lines and The deep trench that accompanies it is a strong earthquake and a new tectonic activity area. The Atlantic made