塔里木地台与华北地台的关系

塔里木地台与华北地台的关系是地学界非常关心和十分重要的问题。本文依据最新航磁资料,对这一问题进行了初步探讨,指出:在罗布泊至阿拉善长达1700余km范围内存在四种不同类型的磁场,它们分别代表了不同性质的基底岩相构造。由磁场所反映的基底岩相构造表明,塔里木地台与华北地台在前寒武纪或更早的时候可能是相连的,但经过古生代的强烈构造运动,现今两大地台已经不相连了。

THE RELATIONSHIP BETWEEN THE TARIM PLATFORMAND THE NORTH CHINA PLATFORM

The relationship between the Tarim platform and the North China plat-form is a very important problem for which geologists show great concern.Based on the aeromagnetic data obtained recently, this paper make a preli-minary discussion and points out that in an area of over 1700km² from LopLake to Alxa there exist four different types of magnetic field, which repre-sent respectively basement lithofacies structures of different natures.The base-ment lithofacies structures shown by magnetic fields suggest that the Tarimplatform might have been linked with the North China platform in Precam-brian or earlier. Nevertheless, as a result of strong tectonic movement in Pale-ozoic, they separated and are hence no longer connected with each other now.