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Anomalous directions and paleointensity of the geomagnetic field based on paleomagnetic investigations of rocks from the Karadzha Range (Azerbaijan) of the age 45–20 ka

Authors
  • Pilipenko, O. V.1
  • Sharonova, Z. V.1
  • Trubikhin, V. M.2
  • Abrahamsen, N.3
  • 1 Russian Academy of Sciences, Schmidt Institute of Physics of the Earth (IPE), Bol’shaya Gruzinskaya ul. 10, Moscow, 123995, Russia , Moscow (Russia)
  • 2 Russian Academy of Sciences, Geological Institute, Pyzhevskii per. 7, Moscow, 119017, Russia , Moscow (Russia)
  • 3 University of Aarhus, Aarhus, Denmark , Aarhus (Denmark)
Type
Published Article
Journal
Izvestiya, Physics of the Solid Earth
Publisher
SP MAIK Nauka/Interperiodica
Publication Date
Jun 09, 2009
Volume
45
Issue
6
Pages
508–519
Identifiers
DOI: 10.1134/S1069351309060044
Source
Springer Nature
Keywords
License
Yellow

Abstract

Paleomagnetic investigations of marine and subaqueous deposits in the 12-meter marine terrace of a section of the Karadzha Range (Azerbaijan) are performed. These deposits correspond to OI stage 3 and encompass the time interval ∼45–20 ka. Four anomalous deviations of the magnetization from the dipole field at the sampling site are recorded in the upper and lower transgressive members of deposits. Investigations of the influence of the anisotropy of the magnetic susceptibility (AMS) on directions of the natural remanent magnetization (NRM) showed that only three of the four identified intervals can actually reflect geomagnetic field changes. The fourth interval of the anomalous NRM behavior is recorded in samples demonstrating the presence of the identified AMS direction pointing to a possible deformation of layers, which could turn the NRM vector toward the direction of the acting factor. Based on the age of the terrace under investigation, three other anomalous horizons could correspond to heavily reduced records of the Mono and Lashamp excursions of the geomagnetic field.

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