关键词: 鄂尔多斯地块, 北向位移, 逆时针旋转, 印支运动

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