张北汉诺坝玄武岩的岩石磁学性质研究  

ROCK-MAGNETIC PROPERTIES OF HANNUOBA BASALT IN ZHANGBEI SECTION

作　　者：田莉丽[1] 朱日祥[1] 潘永信[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100101

出　　处：《地球物理学报》2002年第6期832-838,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目 (4 983 40 0 1 );中国地震局构造物理开放实验室基金 (990 5 ) .

摘　　要：通过新河口汉诺坝玄武岩的综合岩石磁学测定和分析 ,确定了该剖面 2 1个熔岩流的磁性矿物是以钛磁铁矿为主 ,部分含钛较高 .基于磁化率各向异性测定 ,推断张北汉诺坝玄武岩是由位于北东和北北西两个方向的古火山口喷发而成 ,这与野外观察一致 .这一结果对探讨火山喷发历史和地球深部过程是有意义的 .By comprehensive rock-magnetic analyses of the Hannuoba basalt in the Zhangbei section, it has been shown that the main magnetic carriers of the twenty-one lava flows in this section are titano-magnetite, but the content of Ti is relatively high in some samples. Based on the anisotropy of magnetic susceptibility (AMS), the Hannuoba basalt was probably originated from two volcanoes that locate in the northeast and north-northwest directions, respectively which is consistent with the field observation. These results contribute to a better understanding of the eruption history of volcanoes and the deep Earth's interior processes in this region.

关 键 词：汉诺坝玄武岩 岩石磁学 磁化率 各向异性 钛磁铁矿 地理分布 

分 类 号：P588.145[天文地球—岩石学]