古生代与三叠纪中国各陆块在全球古大陆再造中的位置与运动学特征  

Positions and Kinematics of Chinese Continental Blocks in Reconstruction of Global Paleo-continents for Paleozoic and Triassic

作　　者：万天丰[1] 朱鸿[2] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质大学地球科学与资源学院,北京100083

出　　处：《现代地质》2007年第1期1-13,共13页Geoscience

基　　金：国家自然科学基金项目(40674046)

摘　　要：在尊重比较可靠的、测试精度较高的地块古地磁数据,重视生物古地理与地质构造演化史的相似性和协调性等原则的基础上,笔者编制了中国大陆及邻区各陆块古生代和三叠纪的古地磁数据表,并采用类似的比例尺,将中国各陆块放到相应的全球古大陆复原图上去。由此可以清晰地看出,在古生代早期全球各大陆的主要部分都位于赤道附近及南半球,大致表现为沿纬度、呈东西向排列的特征,中国及邻区的小陆块群在古生代始终都处在劳伦大陆、西伯利亚与冈瓦纳大陆之间;随着西伯利亚大陆的快速北移,在劳伦大陆与冈瓦纳大陆的西部地区发生南北向拼合,亚皮特斯洋和里克洋的消亡,到古生代晚期形成统一的泛大陆;而冈瓦纳大陆的东部(澳大利亚和印度等)则逐渐向南移动、离散,地壳张开,构成古特提斯洋;中国及邻区的小陆块群则一直处在古特提斯洋中,保持离散状态,总体上缓慢地向北运移,并逐渐转为近南北向的排列方式,石炭纪到三叠纪才在天山—兴安岭、昆仑山、秦岭—大别、金沙江和绍兴—十万大山等地段发生一系列局部性的陆陆碰撞,使中国大陆地块的大部分逐渐并入欧亚大陆。Based on the principles to respect believable and higher precise paleomagnetic data of blocks and to pay attention to the similarity of paleo-biogeography and the coordination of tectonic evolution, the paleomagnetic data of Chinese continental blocks and adjacent areas for Paleozoic and Triassic were collected, the Chinese continental blocks were laid up on the reconstruction of global paleo-continents with similar scale. Thus, it can be clearly recognized that the global continents located at near equator and southern hemisphere, showed the characteristics of range along latitude; Chinese continental blocks still located among the Laurentia, Siberia and Gondwarm in Paleozoic ; following the fast moving of Siberia plate to northwards, the amalgamation in north-south direction at the western parts of Laurentia and Gondwana, subducted the Iapetus and Rheic Oceans, until to form the uniform Pangea in the late stage of Paleozoic ; however Australia and India plates in eastern Gondwana move and disperse gradually to southwards, to extend crust and form the Paleo-Tethys Ocean; the Chinese continental blocks and adjacent blocks still located in Paleo-Tethys Ocean, preserved the status of dispersion, gradually moving to northwards, showed the characteristics of range along north-south orientation, until Carboniferous and Triassic a series of local collisions happened in Tianshan-Hing＇anling, Kunlun, Qinling-Dabie, Jingshajiang and ShaoxingShiwandashan zones, thus the most part of Chinese continental blocks amalgamated to Eurasia continent.

关 键 词：古大陆再造 运动学 劳伦大陆 西伯利亚 冈瓦纳大陆 中国各陆块 

分 类 号：P541[天文地球—构造地质学]