关键词: 古地磁, 大地构造, 构造演化, 显生宙, 视极移曲线

Abstract: Synthetic Phanerozoic appanent polar wander paths for the North China,Yangtze and Tarim blocks are obtained by averaging paleopoles distributed in a small area for a defined geolog-ical time of a block.This area contains not only most of higher quality paleopoles but also some lower ones.Base on the synthetic APW paths and considering tectonics,paleontology and global geo-graphical reconstruction,we suggest that the North China,Yangtze and Tarim blocks were lo-cated along the lower paleolatitudes near the Eastern Gandwana during the Cambrian,With the clockwise rotation of global main continents in the Paleozoic,the Gandwana moved southwards to the middle-high paleolatitutes of the southern hemisphere and three stable blocks of China were separated in turn form Eastern Gandwana. In the Late Paleozoic these blocks and terraneswith Cathavsian flora were located on tropical or relatively low paleolatitudes. Clearly,they be-long neither to Gandwana nor to Laurassia. Rather they might be distributed in the middle Tethys as an independent assemblage.The collision and weld of the three blocks of China took place from the latest Permian to the late Jurassic. North China and Mongolian blocks had joined by the Permian before they accretedto Siberian plate. This accretion did not take place until the Cretaceous,when the basic frame-work of Eurasia was formed.

Key words: Paleomagnetism, Geotectonics, Structural evolution, Phanerozoic, APW paths