一、前言中国地质,在南方与北方有显著的区别,这是人所周知的事实。但是这个划分以何处为界,和以什么地质条件作为划分的主导因素,则至今尚无使人满意的解答。作者等分析了我国解放以后,特别是文化大革命以来所取得的丰富地质资料,并于1973-1975年组成研究组分别对秦岭东西段及祁连山北部进行了考察研究,肯定了兰片岩和混杂堆积在秦岭和祁连山的存在,结合蛇纹岩带等,试图用板块构造学说说明构造发 I. Preface China’s geology is markedly different in the South and the North. This is a well-known fact. However, where this division is located and what geological conditions are the dominant factors for the division have so far not been satisfactorily answered. The author analyzed the rich geological data obtained since the liberation of our country, especially the Great Cultural Revolution. In 1973-1975, the research group made a study on the eastern and western parts of the Qinling Mountains and the northern part of the Qilian Mountains, respectively, and confirmed that the blue schists and the mixed deposits Qinling Mountains and the existence of the Qilian Mountains, combined with the serpentine belt, trying to use plate tectonic theory that tectonic hair