摘要
本文利用Thellier方法测定了大同火山群中金山、黑山和东水头圆沟三个剖面形成时的古地磁场强度,并利用矢量差分析确定了相应的古地磁场方向.根据古地磁场测定结果,对大同火山群活动时代以及侵入岩与固岩的剩磁特征作了探讨.
The intensities and directions of paleomagnetic field are obtained from Jinshan, Heishan and Tongshuitou basalt section in Datong volcanic cluster using Thellier method and vector analysis. The results of the paleomagnetic field show that the activation times of Datong volcanic cluster arc from 0.19Ma to 0.098Ma and that the rcmanent characterristics of the surrounding rock change with its distance from the intrusion, which can be divided into three types: the layer from the contact to 15 cm into the surrounding rock has same remanence with the intrusion; 10 cm below above layer is a transition zone; the layer below which keeps its original remanence.
出处
《中国科学院研究生院学报》
CAS
CSCD
1990年第2期72-78,共7页
Journal of the Graduate School of the Chinese Academy of Sciences
关键词
古地磁
大同地区
玄武岩
晚新生代
paleomagnctism
Dciong region
basalt
late Cenozoic
