Abstract

We present the first results of a detailed rock magnetic and paleomagnetic research of the Mga marine interglacial sediments of the Mikulino (Eemian) Interglacial (the Upper Pleistocene) in the Etalon section (former Sverdlov Factory, Leningrad Region). The Blake geomagnetic excursion was determined in the upper part of the Mga formation according to a shallow inclination of the characteristic remanent magnetization (ChRM) component. Age of the Blake excursion was obtained as 117 ± 7 ka applying optically stimulated luminescence (OSL) dating. The results obtained are in good agreement with other Blake Event records. The ChRM in the Mga sediments is related to syngenetically formed biogenic greigite produced by magnetotactic bacteria.

中文翻译：

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涅瓦低地米库利诺间冰期沉积物中记录的布莱克地磁偏移

摘要

我们展示了 Etalon 剖面（前列宁格勒地区斯维尔德洛夫工厂）米库利诺（埃米安）间冰期（上更新世）Mga 海洋间冰期沉积物的详细岩石磁性和古地磁研究的第一个结果。根据特征剩磁 (ChRM) 分量的浅倾角，确定了 Mga 地层上部的 Blake 地磁偏移。应用光激发光 (OSL) 测年法获得布莱克偏移的年龄为 117 ± 7 ka。获得的结果与其他布莱克事件记录非常吻合。Mga 沉积物中的 ChRM 与趋磁细菌产生的同生形成的生物灰岩有关。