ИСТИНА

A detailed rock magnetic study of marine deposits of Skela section was carried out with the goal to obtained magnetostratigraphy data. The Skela section is located on the Azov sea coast of Kerch peninsula, Crimea (45o45′N, 36o46′E). The section has a total thickness of ~ 100 m and composed mainly of clays. Skela section covered the Tarhanian stratigraphic interval of the Miocene. 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 ranged about 230-320 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 PSD 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.