An Attempt to Identify the Signs of Cooling Following the Magnetic Field Weakening During the Matuyama-Brunhes Transition (Paks Loess Profile, Hungary)

Detailed paleomagnetic and rock magnetic investigations of the Paks loess (Hungary) were conducted to determine the stratigraphic position of the Matuyama-Brunhes Transi-tion (MBT) and to attempt to reveal the sign of any possible influence of geomagnetic field change on climate during the geomagnetic polarity reversal. Progressive thermal and al-ternating field demagnetizations of samples showed that the reverse polarity field begins to fluctuate in a stratigraphic position of the well-developed, so-called Paks Double 2 (PD2) paleosol (formed in Marine Isotope Stage 19 - MIS19), and continues up to the mid-dle to upper part of the overlying paleosol-to-loess transition layer (MIS19 to 18). Consid-ering the relative paleointensity variation from Paks, it is consistent with various global records. Along with the weakening of the geomagnetic field, changes in environmental proxies were also recognized. Magnetic proxies indicate cooling during the MIS19 inter-glacial period. Theoretically, it may be connected to the weakening of the geomagnetic field. Still, there are alternatives to be considered, which may form the same features thought to be the result of the Umbrella effect.