MAGNETOSTRATIGRAPHIC AND MAGNETIC PROPERTIES OF MARINE SEDIMENTS FROM THE EAST PHILIPPINE SEA

A detailed magnetic analysis has been done on core F090102 from the East Philippine Sea,and the following magnetic parameters were measured:susceptibility(X),anhysteretic remnant magnetization(ARM), saturation isothermal remnant magnetization(SIRM), IRM_{-300 mT} (induced in a field of -300mT)and typical temperature dependence of magnetic susceptibility curves (X-T).Analyses of magnetic parameters demonstrated that magnetic minerals in the sequence are dominated by low-coercivity ferromagnetic minerals with subordinate high-coercivity antiferromagnetic minerals and are characterized by magnetite (probably including some titanomagnetites). The results show that the rock-magnetic parameters well correspond to the paleoclimatic variations and sedimentary environmental changes.And a magnetostratigraphic record was obtained.The Bruhnes-Matuyama reversal, the Jaramillo event as well as the Olduvai event during the Matuyama period were identified.