SUMMARY

Diluted slurry with an initial density of 1.30 g cm⁻³ prepared from natural glacial Black Sea sediments was deposited under controlled field conditions between 1.72 and 114.21 µT. Compaction was achieved by evaporation of a portion of the pore water from the open sample boxes over 4–7 d until a density of about 1.44–1.55 g cm⁻³ was reached. Magnetizations M acquired in a magnetic field B follow a slightly non-linear function with M ∼ B^0.82. Similar relationships were also obtained for palaeointensity estimates for the artificial samples by using normalization by low-field susceptibility, anhysteretic remanent magnetization and saturation magnetization. All samples are characterized by a magnetic fabric typical for natural sediments as checked by determining the anisotropy of magnetic susceptibility. The sediments’ anisotropy is in the range of 6–7 per cent and it is characterized by an oblate anisotropy ellipsoid with its small axis perpendicular to the deposition plane. According to scanning electron microscope imaging low-Ti magnetite particles present in the used sediments are in the range of 1–30 µm with the majority of particles 2–5 µm in size. Obtained results confirm the conclusion from other magnetostratigraphic studies that the Laschamps geomagnetic polarity excursion in the Black Sea area exhibited field values as low as 2.8 µT in its transitional phase between normal and reversed polarity.

中文翻译：

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在大约2到114 µT的磁场中用SE黑海的天然沉积物进行再沉积实验

概要

由天然冰川黑海沉积物制备的初始密度为1.30 g cm ^-3的稀浆在受控的田间条件下（介于1.72和114.21 µT之间）沉积。压实是通过在4–7 d内从敞开的样品盒中蒸发一部分孔隙水直至达到约1.44–1.55 g cm ^-3的密度来实现的。磁化中号在磁场中获得的乙遵循略微非线性函数与M〜乙^0.82。通过使用低场磁化率，迟滞剩余磁化强度和饱和磁化强度进行归一化，对于人工样品的古强度估计也获得了相似的关系。通过确定磁化率的各向异性来检查，所有样品均具有天然沉积物典型的磁性织物的特征。沉积物的各向异性在6％至7％范围内，其特征是扁长的各向异性椭圆形，其小轴垂直于沉积平面。根据扫描电子显微镜成像，用过的沉积物中存在的低钛磁铁矿颗粒范围为1–30 µm，大多数颗粒为2–5 µm。