6:15 PM - 7:30 PM
[SEM34-P06] Remanent magnetization observed in core sediments from the Ichinomegata Maar, Akita Prefecture
Keywords:Remanent magnetization, magnetic susceptibility, Ichi-no-megata Maar
The core sediments are mostly composed of laminated clay or silt intercalating sandy turbidite layers. According to correlation between the Mackereth cores and the piston cores based on lithological and magnetic susceptibility data, it is revealed that uppermost parts of the piston cores were missed. Inclinations of minimum axis and shape parameters q of AMS ellipsoids indicate that turbidite layers of upper parts have not preserved primary sedimentary fabric. Stepwise AF demagnetization of the NRM showed that remanence of the laminated layer is more stable than turbidite layers. Therefore, we argue that the turbidite sediment is not suitable for preservation of NRM.