滇中昆阳群古地磁研究

来源期刊：中南大学学报(自然科学版)1998年第6期

论文作者：范效仁 李杏林 刘继顺

文章页码：9 - 12

关键词：昆阳群; 古地磁; 磁清洗; 视极移路径; 古纬度

Key words：Kunyang group; palaeomagnetism; magnetic cleaning; apparent polar wandering path(APWP); palaeolatitude

摘    要：对昆阳群中采集的283块样品用热退磁法做了磁清洗处理，经精度检验，进行了统计分析.根据获得的古地磁结果，探讨了昆阳群地层所代表的古地磁极性和古纬度，建立了该地区中、晚元古界古地磁视极移路径，并与华北地块及扬子地块该时期的视极移路径进行了对比，讨论了其构造运动及相互之间的关系，认为下昆阳亚群与长城系古纬度相近，古地磁极性及视极移路径可比，时代相当.

Abstract: We have carried out magnetic cleaning for 283 specimens which were collected from the Kunyang group in Central Yunnan by thermal demagnetization. The samples which have stable remanent magnetization are used. Based on the palaeomagnetic results, the palaeomagnetic pole positions, polarity and palaeolatitude from Proterozoic in Central Yunnan are discussed, the apparent polar wandering path(APWP) is drawn, the crustal movements and relations are futher discussed in comparison with APWP from Proterozoic in both Yangtze block and North China block. The palaeomagnetic results indicate that the lower Kunyang subgroup and the Changcheng system in North China are corresponding in palaeolatitude, equal in time and similar in APWP and palaeomagnetic polar characteristics.