Environmental magnetism and paleoclimatic interpretation of the Sanmenxia loess-paleosol sequence in the southeastern extremity of the Chinese Loess Plateau

这是多参数矿物质的一份报告在在间隔 ofL1 上的中国黄土高原(CLP ) 的 SE 极限的 Sanmenxialoess-paleosol 两行诗的磁性的结果 - 跨越最后 1 个妈的 L13。这些结果显示出那团特定的磁性的危险性(x) ， Xarm 和 SIRM，他们的比率展出平行 stratigraphic 变化。Sincesuperparamagnetic (SP ) 粒子有重要贡献到到顽磁的 X 而是没有贡献，例如，手臂和 SIRM，在 x 之间的强壮的线性关联一(i 顽磁(例如， ARMand SIRM ) 建议生产成土作用的磁性的谷物是主要在里面小单个领域范围。因而，到想在以前的研究的体积 x 的 SP 粒子的重要贡献显然被过高估计。在 Sanmenxia 和中部的谷物尺寸的 2arm/X 数据从 CLP 显示的内地典型黄土节记录强壮的相似，暗示 Jarm/X 可以为监视变化 offerrimagnetic 谷物被认为是可靠指示物缩放。S 比率和 HIRM 的结果((SIRM+IRM_(.3T ))/2 ) 大小显示在与成土作用联系的 paleosols 有软磁铁矿 / 磁赤铁矿和 hardhematite/goethite 的重要改进。

This is a report of multi-parameter mineral magnetic results of the Sanmenxia Ioess-paleosol couplets in the SE extremity of the Chinese Loess Plateau （CLP） over the interval of L1-L13 spanning the last 1 Ma. These results show that mass-specific magnetic susceptibility （X）, ZARM and SIRM and their ratios exhibit parallel stratigraphic variations. Since superparamagnetic （SP） particles have significant contribution to Z but no contribution to remanence, e.g., ARM and SIRM, the strong linear correlations between X and remanence （e.g., ARM and SIRM） suggest that the pedogenesis-produced magnetic grains are predominantly in small single domain range. Consequently, the significant contribution of SP particles to the bulk Z as supposed in previous studies has been obviously overestimated.XARM/X data in Sanmenxia and median grain size records of typical loess sections from the hinterland of the CLP display a strong resemblance, implying that XARM/X may be regarded as a reliable indicator for monitoring the variations of ferrimagnetic grain sizes. The results of S-ratio and HIRM （（SIRM＋IRM-0.3T）/2） measurements indicate that there is significant enhancement of both soft magnetite/maghemite and hard hematite/goethite in paleosols associated with pedogenesis.