Palaeomagnetic and rock magnetic properties of sediment cores from Chalkidiki, Greece

A detailed palaeomagnetic investigation was performed on Eocene and Oligoce ne core samples from 4 deep boreholes (1-3.1 km) from the Chalkidiki penins ula. Both low field magnetic susceptibility and intensity of the natural re manent magnetization (NRM) indicate rather weakly magnetised materials. 134 samples have been subjected to either stepwise thermal or alternating fiel d demagnetization. Both procedures indicate that the NRM is carried by magn etite. Isothermal remanent magnetization (IRM) acquisition curves suggest t he dominance of magnetite. Finally, 12 thin sections were studied in order to more precisely characterise the magnetic mineralogy of the samples. This investigation reveals the presence of magnetite and pyrite. In general, th e observed inclinations of characteristic remanence in these rocks are much lower than expected inclinations but converge with those obtained from for mations on land. (C) 2001 Elsevier Science Ltd. All rights reserved.