华北地块晚古生代至三叠纪古地磁研究新结果及其构造意义  

PALEOMAGNETIC OBSERVATIONS IN NORTH CHINA BLOCK: FROM LATE PALEOZOIC TO TRIASSIC

作　　者：吴汉宁[1] 朱日祥[2] 刘椿[3] 常承法[3] 

机构地区：[1]西北大学地质研究所,西安710069 [2]中国科学院地球物理研究所,北京100101 [3]中国科学院地质研究所,北京100029

出　　处：《地球物理学报》1990年第6期694-701,共8页Chinese Journal of Geophysics

摘　　要：本文对采自华北地块南缘陕西铜川和韩城两条剖面上的晚石炭世至晚三叠世地层的650余块标本(35个采点)进行了系统的古地磁研究.经逐步热退磁处理和剩磁稳定性检验,在482块标本中获得稳定的特征剩磁分量,对其形成时代作了地质学分析后,以特征剩磁分量为基础,计算了华北地块在晚古生代到三叠纪的地磁极位置和纬度值,简单讨论该期内的运动形式.Paleomagnetic samples have been collected from two sections at two locations: Tongchuan and Hancheng in Shaanxi Province. The samples were taken from sandstone and red mudstone from Upper Carboniferous to Upper Triassic. Stepwise thermal demagnetizations have been carried out on about 650 samples (53 sites). 482 samples among them have yielded successful results. High temperature characteristic components were successfully isolated from all the sites. Based on the results the paleopole positions and paleolatitudes are obtained and the movement of North China Block in these Periods are discussed.

关 键 词：古地磁学 华北 地块 晚古生代 

分 类 号：P318.4[天文地球—固体地球物理学]