Figure F5. Magnetization behavior upon heating and cooling of two representative basalt samples, Hole U1301B. Sample 301-U1301B-13R-1, 130 cm, shows a reversible curve and gives a Curie temperature (Tc) of 179°C. Sample 301-U1301B-20R-1, 28 cm, is not reversible upon cooling and gives a Curie temperature of 339°C.