用华北与扬子陆块古地磁探讨秦巴地区的构造演化

在收集、整理和分析华北及扬子陆块古地磁数据的基础上,作者结合秦巴地区丰富的地质资料,将华北陆块和扬子陆块由震旦纪—第三纪的发展、演化划分为3个阶段:震旦纪末—志留纪活动阶段;志留纪末期—晚三叠纪相互牵制阶段;晚三叠纪—第三纪稳定阶段,由此认为,秦巴地区相应的3个阶段分别为:洋壳—陆壳发展阶段;陆壳的拉张→裂陷→收缩阶段;陆壳的固结、隆起阶段。

THE APPLICATION OF THE PALEOMAGNETIC DATA OF NORTH CHINA AND YANGTZE AND THE TECTONIC EVOLUTION IN THE QINLING-DABASHAN REGION

In the course of studying the tectonic evolution in the QinglingDabashan region, the author gradually realizes that the evolution and paleoenvironment at all stages of the region, which is located between North China and Yangtze blocks, depended on their relative locations and interrelation. For this purpose, author collects a lot of North China and Yangtze open published paleomagnetic data which can serve as important mean for the investgation of plate activities. On the basis of calculation, sorting out and analysis of there data, and combrised with the reference of rich geological materials from all parts of the region, the development and evolotion between the blocks from Sinian to Tertiary Period is then divided into three stages: the late Sinian to Silurian active stage, the late Silurian to Late Triassic intesrestucted stage and the Late Triassic to Tertiary stable stage. From the above-classification, author can abtain three corresponding developing stages of the region, i. e. the oceanic crust to continental crust developing stage, the pulling-apart to downrifting to contraction stage of the continental crust, and the solidification and up rise stage of the continent.