3.3. Rock Magnetism Results
According to the High Temperature Magnetic Susceptibility measurements,
the transition of maghemite to magnetite can be seen with an increase in
susceptibility values at approximately 250-350 °C (Fig. 9). The samples
have a Curie temperature between 530-550 °C which may be a sign of
titanium in the minerals and of a new sulphite phase created from
decomposing the maghemite and incorporation of the sulfur from the
surrounding clay. The increase of susceptibility values in the cooling
curves corresponds to the percentage of maghemite decrease after the
heating in the samples (Fig. 9a, c, d). Two different drops in
susceptibility values at 410 °C and 530 °C in Fig. 9c shows the
existence of maghemite and magnetite together in the sample.