吉林省北部西土山火山岩的地质特征及其形成的地质时代

GEOLOGICAL FEATURES AND AGE OF THE XITUSHANVOLCANIC ROCKS IN THE NORTHERN PART OF JILIN PROVINCE

本文以实际资料，叙述了西土山火山岩的地质、岩石化学、微量元素、稀土元素等方面的特征。与中国晚三叠世火山岩对比较吻合。且以较丰富的古生物及同位素年龄资料论证了西土山火山岩的地质时代属晚三叠世。

Based on a large amount of geological data, in this paper,described geological features,petrochemistry,trace elements and rare earth ements of the Xitushan volcanic rocks. Thesefeatures are in accordance with that of the late Triassic volcanic rocks of China. In addition,the paper demonstrates that the geological age of the Xitushan volcanic rocks belongs to lateTriassic period according to the abundant paleontological aiid isotopic age data.