从七十年代中期开始,随着大陆边缘地质工作的深入开展和古地磁学方法的广泛应用,首先在北美西部科迪勒拉地区诞生了一种新的大地构造理论——构造地层地体理论(简称地体理论).以后,在美、加、日、澳等国学者共同努力下,很快使这一学说推广到了北起阿留申群岛,南至南极大陆的整个环太平洋地区.在原来认为均一的构造岩相 Beginning in the mid-1970s, with the deepening of geological work on the margins of the mainland and the extensive application of paleomagnetic methods, a new theory of tectonics was first developed in the Cordillera area of ​​western North America - the theory of tectonic stratigraphy and terrain (Referred to as terrestrial theory) .Through the joint efforts of scholars from the United States, Canada, Japan, and Australia, this theory was quickly extended to the entire Pacific Rim from the Aleutian Islands in the north to the Antarctic continent in the south. It is considered that the tectonic facies are uniform