吉林省东部地区古地磁结果的大地构造意义

TECTONIC IMPLICATIONS OF PALEOMAGNETIC DATA FROM EASTERN AREA OF JILIN PROVINCE,CHINA

通过对采自吉林省延边地区和浑江地区的９个采样地层（延边地区：Ｋ１ｄ，Ｔ３ｍ，Ｐ１ｋ，Ｐ１ｍ，Ｃ３ａ；浑江地区：Ｔ３ｂ，Ｐ，Ｃ３ｔ，Ｏ１１的５１２块定向岩芯样品的古地磁研究，运用综合的多磁成分分离技术和古地磁欧拉极的最佳小圆拟合法，对延边、浑江两地体的构造演化历史及其相对运动作了初步探讨。提出了延边、浑江是作为两个相互独立的微板块（地体）以各自不同的构造演化模式在早白垩世之前和这一时期内的其他微板块（地体）一起拼贴到华北地块的东缘，成为华北地块的一部分。

In this paper,the paleomagnetic data of 512 oriented samples obtained from stratigraphic Units of K1d,T3m, P1k,P1m,and C3 in Yanbian region and T3b,P,C3t,and O11 in Hunjiangregion are given.Using the technique of syntnetic multicomponent seperation and the method of the best fit small circle of the paleomagnetic Euler poles, we studied all the demagnetized data of these two regions and tried to interpret the absolute motion and relative motion of Yanbian and Hunjiang microplates.We proposed that there are different sources and tectonic motional medels of these two terrains. Both Yanbian terrain and Huejiang terrain accreted to the eastern margin of the North China block before Early Cretaceous, and became a fraction of the terrain masses of the eastern matgin of the North China block.