摘要
使用超导磁力仪对石笋进行高精度、高密度的连续测定,获得了桂林地区如下古地磁场长期变化研究结果。 1.8500a B.P.以来,桂林地区的古地磁场偏角以及倾角的长期变化曲线是由若干周期大小不同的运动复合而成的。虚地磁极迁移曲线的运动中心与现代地理轴不重合。 2.利用NRM/SIRM(天然剩磁/饱和等温剩磁),求出8500aB.P.以来,桂林地区古地磁场相对强度的长期变化曲线是由若干周期大小不同的运动复合而成的。
A successive study of stalagmite have been made by using SQUID magnetometer with high precision and density, obtaining an expected result of the long-term variation of paleomagnetic field.
1.Since the past 6500 years or so, the long -term variation curve of D and I of the paleomagnetic field in Guilin is a composite activity, including different cycles of various variation. The VGP transfer curve center does not coincide with the geographical axis.
2.According to the application of DRM/SIRM, the long-term variation curve of relative intensity of the paleomagnetic field in Guilin is also a composite activity of various variation cycles.
出处
《中国岩溶》
CAS
CSCD
北大核心
1991年第4期345-349,共5页
Carsologica Sinica
基金
国家自然科学基金资助项目
关键词
洞穴
化学沉积物
岩溶
古地磁学
Paleomagnetism
NRM( natural remanent magnetization), SIRM (saturation remanence)
Speleothem, Stalagmite
Guilin
