【摘要】 通过对长岛沉积物采样和磁性测试,分析和讨论了长岛黄土沉积物的磁性特征:该剖面磁性矿物的含量并不是很高,且以亚铁磁性矿物为主,磁性矿物的粒度主要以细粒为主,亚铁磁性矿物的变化在沉积物磁性变化中占主导地位。通过对沉积物磁性特征和碳酸盐特征的对比发现:该剖面沉积物磁化率和碳酸盐具有很好的对应关系,并且明显表现出4个阶段的主要变化,对应了暖湿和冷干的气候旋回。根据沉积物的磁化率与古气候环境的内在联系,结合碳酸盐含量变化情况,对该地区风成沉积物的物源变迁及环境演变也进行了初步探讨和分析。更多还原

【Abstract】 In the paper,the sediment of Changdao was selected for analysis.Based on the magnetic measurements on the sediment,we found that the changes of magnetic susceptibility appeared as fours obviously main stages.The contents of magnetic minerals were not high and the ferrous magnetic mineral played a leading role.Meanwhile,the granule also played a leading role in the magnetic grains.The changes of the ferrous magnetic were in the highest place of the magnetic changes of the sediment.According to the comparison between magnetic susceptibility and CaCO3,we found that magnetic susceptibility and CaCO3 had great corresponding relationship and they can be divided four parts.These parts corresponded with the climate gyration.Besides,with the inner relationships among magnetic susceptibility,CaCO3 and the ancient climate,we made a primary research of the material resource and the environmental changes.更多还原