Reliability of the natural remanent magnetization recorded in Chinese loess
会议名称：《中国科学院地质与地球物理研究所第十届(2010年度)学术年会》
会议日期：2011年
学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学]
基 金：supported by NSFC 40974036 and 40821091 the 100 Talent Program of the Chinese Academy of Sciences
摘 要：[1]Chinese loess-paleosol sequences undoubtedly have recorded geomagnetic events (both polarity reversals and excursions).However,the fidelity of the rapid paleomagnetic field oscillations during a polarity reversal remains *** test the reliability and consistency of the natural remanent magnetization records in Chinese loess,10 subsets of parallel samples across the Matuyama-Brunhes(MB)reversal boundary were obtained from the Luochuan region in the hinterland of the Chinese Loess *** paleomagnetic results show diversified virtual geomagnetic poles(VGPs)during the MB transition but consistent VGPs outside of the transitional *** anisotropy of magnetic susceptibility and rock magnetism results indicate that the sampled interval is rather uniform and *** discrepancies of the characteristic remanent magnetization within the MB transition are probably due to the low efficiency in aligning magnetic grains,mainly pseudo-single-domain magnetite,associated with the low field intensity. Nevertheless,the stratigraphic location of the MB boundary can be confidently defined. Therefore,we conclude that Chinese loess-paleosol sequences can record geomagnetic reversal events,but the morphology within the polarity transition is rather questionable.