“三群”者,乃指秦岭群,宽坪群和陶湾群。 “三群”处于中国大陆的腹地,横亘东西,绵延千余公里,号称中国南北之“分野”。其重要性,早为中国地质界公认,近年来尤为国外人士所瞩目,吸引着大批中外地质专家接踵而来,探索其奥秘,揭示其本质。目前,随着地质部组织的秦巴科研项目的全面开展,对“三群”的研究,将会掀起新的热潮,并更加引向深入。 一、历史回顾 综观“三群”之研究史,大致可分为路线地质调查,一比二十万区调和专题调研三个阶 “Three groups”, refers to the Qinling Group, Kuan Ping Group and Tao Wan Group. The “three groups” are located in the hinterland of the Chinese mainland. They run across thousands of kilometers and are called “divisions” of North and South China. Its importance, as early recognized by the Chinese geology community, has attracted much attention from foreigners in recent years. It has attracted a large number of Chinese and foreign geologists to come and explore their mysteries and reveal their essence. At present, with the full development of the Qinba scientific research project organized by the Ministry of Geology, the study of the “three groups” will set off a new craze and will further deepen the study. I. Historical Review Looking at the research history of the “three groups”, they can be broadly divided into three parts: the route geology survey and the survey of one hundred and twenty thousand districts