Abstract: The Sino-Korea Platform consists of the Ordos the block, Taihangshan block, Jilu block, Jiaoliao block and so on. The paleomagnetic pole positions of Late Permian and early Triassic are statistically consistent for these blocks, which shows that these parts had already been coherent units within the Sino-Korea Platform since Late Permian. The paleomagnetic pole positions for the Ordos block are 42.3癗, 13.7癊 in Late Permian, 49.1癗, 12.5癊 in Middle Triassic, 80.3癗,249.4癊 in Middle Jurassic and 84.6N, 310.2癊 in Early Cretaceous, respectively. These suggest that the Sino-Korea Platform underwent a northward movement from low latitude of about 19癗 to middle latitude and rotated counterclockwise by about 50?. The major northward movement took place from Late Permian to Middle Triassic whereas the major counterclockwise rotation from Middle Triassic to Middle Jurassic. The tectonic evolution of the Sino-Korea Platform from Middle Triassic to Middle Jurassic may be related to the collision between the so-called Indosinian orogeny.

Key words: Ordos block, Northward movement, Counterclockwise rotation, Indosinian orogeny

摘要： 鄂尔多斯地块与中朝地台其它地区相同时代地层的古地磁结果基本一致表明:晚二叠世以来,中朝地台经历了从低纬度(19°左右)向中纬度的北移过程,并伴有50°左右的逆时针旋转;晚二叠世—中三叠世地台北移10°(1000km)左右,而方位基本未变;中三叠世—中侏罗世主要发生50°左右的逆时针旋转,而北向位移不明显,这一旋转可能与杨子地台和中朝地台碰撞拼合有关,或者说是印支运动在该地区的反应,中侏罗世—早白垩世地块已基本和现代位置一致。

关键词: 鄂尔多斯地块, 北向位移, 逆时针旋转, 印支运动