The Blake geomagnetic excursion recorded in the Mikulino Interglacial sediments of the Neva Lowland

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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.

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About the authors

V. I. Dudanova

Lomonosov Moscow State University; Schmidt Institute of Physics of the Earth, Russian Academy of Sciences

Email: roman.veselovskiy@ya.ru

Geological faculty

Russian Federation, Moscow; Moscow

R. V. Veselovskiy

Lomonosov Moscow State University; Schmidt Institute of Physics of the Earth, Russian Academy of Sciences

Author for correspondence.
Email: roman.veselovskiy@ya.ru

Geological faculty

Russian Federation, Moscow; Moscow

M. V. Ruchkin

Saint Petersburg State University; Karpinsky Russian Geological Research Institute

Email: roman.veselovskiy@ya.ru

Institute of Earth Sciences

Russian Federation, Saint Petersburg; Saint Petersburg

M. V. Sheetov

Karpinsky Russian Geological Research Institute

Email: roman.veselovskiy@ya.ru
Russian Federation, Saint Petersburg

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2. Fig. 1. Geographical position of the research object (marked with a star) and general view of the reference section in the quarry of the Etalon plant. The photo shows a magnetic polarity column for the Mikulinsky marinium layer, obtained based on the results of the studies: black color - normal polarity, gray color - low inclination interval, comparable with the Blake excursion. Stratigraphic and genetic subdivisions: gm, lgIIms - glaciomarinium, Moscow glaciolimnium; mIIImk - Mikulinsky marinium; gIIIos - Ostashkov glacial deposits (till); lgIIIbl - Baltic glacial lake glaciolimnium.

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3. Fig. 2. Results of magnetic cleanings (a) and paleomagnetism of the Mikulino interglacial sequence in the “Etalon” section (b): χ is the magnetic susceptibility, NRM is the natural remanent magnetization, D is the declination of ChRM, I is the inclination of ChRM, MP is the magnetic polarity. The interval of the section corresponding to the Blake excursion is marked in pink; the dotted line shows the inclination of the central axial dipole in the study area (73.5°).

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