EGU21-14134
https://doi.org/10.5194/egusphere-egu21-14134
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Paleomagnetism and magnetostratigraphy of Tarkhanian sediments of the Eastern Paratethus (Skelya section, Kerch peninsula, Crimea)  

Olga Pilipenko1,2 and Yuliana Rostovtseva2,3
Olga Pilipenko and Yuliana Rostovtseva
  • 1Schmidt Institute of Physics of the Earth RAS, Department of the main geomagnetic field and petromagnetism, Moscow, Russian Federation (pilipenko@ifz.ru)
  • 2Geophysical Center RAS, Moscow, Russian Federation
  • 3Lomonosov Moscow State University, Moscow, Russian Federation (rostovtseva@list.ru)

A detailed paleomagnetic study of Tarkhanian sediments of Skelya section was carried out with the goal to obtained magnetostratigraphy data. The Skelya section is located on the Azov sea side of Kerch peninsula, Crimea (45o42′N, 36o53′E). The Tarkhanian sediments of Skelya section are represented mainly of clays and have a total thickness of ~ 100 m. According to GTS (2012), the Tarkhanian stage of Miocene is related to the lower part of the Langhian of the General Stratigraphic Scale. Standard paleomagnetic measurements have been carried out to investigate magnetic parameters: natural remenent magnetization, magnetic susceptibility, saturation remanent magnetization, anhysteretic   remanent magnetization varied through out the section. The remanent coercitivity force, determined from backfield demagnetization measurements, range between ~34 and 67 mT.   The composition of the ferromagnetic fraction was examined using temperature dependences of saturation remanent magnetic moment. The thermomagnetic analysis showed that the blocking temperatures are  about 320 oC and 410-470 oC and  greigite and titanomagnetite  are the main carriers of NRM in the section.  The biplot of  IRM-100 mT / SIRM versus  ARM40mT /SARM showed that the ratios fall down into the field around the titanomagnetite and greigite areas. The pseudo-single domain  state of titanomagnetite and greigite was determined from their Mrs/Ms and Bcr/Bc ratios by Day-plot. Paleomagnetic studies have shown that the interval of the Kuvinian beds in its upper part is composed of sediments of reversal polarity magnetization. The rocks of the Terskian and Argunian beds are characterized by intervals of normal and reversed polarity magnetization. This work was supported by Russian Science Foundation, project № 19-77-10075.

How to cite: Pilipenko, O. and Rostovtseva, Y.: Paleomagnetism and magnetostratigraphy of Tarkhanian sediments of the Eastern Paratethus (Skelya section, Kerch peninsula, Crimea)  , EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14134, https://doi.org/10.5194/egusphere-egu21-14134, 2021.

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