摘要
基于饱和等温剩磁 (SIRM )获得曲线遵循累积对数高斯模型 (CLG)的假设 ,利用改进的CLG模型分析 ,成功地对采自泥河湾河湖相层上部的许家窑剖面样品所含的主要载磁组分进行了分离 ;结合先前的岩石磁学结果 ,进一步验证了高矫顽力的赤铁矿和低矫顽力的磁铁矿 /磁赤铁矿为许家窑样品的主要载磁矿物 ,并对各磁组分对SIRM的贡献进行了定量估算 ;对CLG模型的优缺点和实用性进行了探讨 ;结合剩磁矫顽力曲线特征 ,尝试提出了X参数的概念。
Based on the hypothesis that the IRM acquisition curve for a single magnetizable mineral phase has the form of a cumulative log Gaussian function, the isothermal remanent magnetization curves for Nihewan lacustrine samples at Xujiayao were successfully fitted by the newly developed CLG methods by Stockhausen and Kruiver, et al. Generally two magnetic components, the relatively strong low coercivity component 1 as magnetite/maghemite and the relatively weak high coercivity component 2 as hematite, were identified in the samples regardless of the variation in concentration and contribution. The absolute SIRMs were even successfully estimated for the two minerals with different coercivities from Gradient acquisition plots. It should be emphasized that for the magnetic minerals with similar coercivities additional rock magnetic tests are essential to distinguish fully overlapping coercivity components. Finally the X ratio was introduced here to describe the concentration and contribution of magnetic components.
出处
《地学前缘》
EI
CAS
CSCD
2003年第1期163-169,共7页
Earth Science Frontiers
基金
国家自然科学基金资助项目 ( 4 0 2 0 2 0 18)
全国地层委员会泥河湾地层断代建阶研究项目
国家人事部留学人员科技活动择优资助项目
