Tiermomagnetic measurements were conducted on 13 samples of Quaternary volcanic rocks of different episodes from three separate localities by Thellier's method.Paleointensities representing three Quaternary sub-pe...Tiermomagnetic measurements were conducted on 13 samples of Quaternary volcanic rocks of different episodes from three separate localities by Thellier's method.Paleointensities representing three Quaternary sub-periods have been obtained : 0.62 for early Pleistocene, 1.01 far middle Pleistocene and 1.57 for late Pleistocene as relative to today's magnetic field intensity. The results indicate that geomagnetic field intensity has been increasing since Pleistocene, and there exists a close relationship between the variations of paleeintensity and climatic fluctuations, i.e. the climate trends to become colder with increasing paleointensity and it is truc for the oppositc case.展开更多
一、引言在实验教学和科研活动中常常会遇到具有磁性的材料,需要分析和研究其磁性质,因此必须首先测量材料的磁晶各向异性场H_A、饱和磁化强度M_s和居里温度T_c等内禀磁性。其中测定H_A的传统方法是通过测量取向样品的磁化曲线来确定,...一、引言在实验教学和科研活动中常常会遇到具有磁性的材料,需要分析和研究其磁性质,因此必须首先测量材料的磁晶各向异性场H_A、饱和磁化强度M_s和居里温度T_c等内禀磁性。其中测定H_A的传统方法是通过测量取向样品的磁化曲线来确定,此处我们介绍一种简便且精度很高的测量方法——奇点探测法(Singular Point Detection,简称SPD技术)。而居里温度T_c可以用振动样品磁强计、磁天平等在弱磁场中进行测量,饱和磁化强度M_s用提拉法装置。展开更多
文摘Tiermomagnetic measurements were conducted on 13 samples of Quaternary volcanic rocks of different episodes from three separate localities by Thellier's method.Paleointensities representing three Quaternary sub-periods have been obtained : 0.62 for early Pleistocene, 1.01 far middle Pleistocene and 1.57 for late Pleistocene as relative to today's magnetic field intensity. The results indicate that geomagnetic field intensity has been increasing since Pleistocene, and there exists a close relationship between the variations of paleeintensity and climatic fluctuations, i.e. the climate trends to become colder with increasing paleointensity and it is truc for the oppositc case.
文摘一、引言在实验教学和科研活动中常常会遇到具有磁性的材料,需要分析和研究其磁性质,因此必须首先测量材料的磁晶各向异性场H_A、饱和磁化强度M_s和居里温度T_c等内禀磁性。其中测定H_A的传统方法是通过测量取向样品的磁化曲线来确定,此处我们介绍一种简便且精度很高的测量方法——奇点探测法(Singular Point Detection,简称SPD技术)。而居里温度T_c可以用振动样品磁强计、磁天平等在弱磁场中进行测量,饱和磁化强度M_s用提拉法装置。
