Figure F6. Representative demagnetization diagrams of Leg 187 samples. The samples were not oriented. A. Thermal demagnetization of pillow basalts, showing a stable direction of natural remanent magnetization (NRM) and high unblocking temperatures up to ~540°C. B. AF demagnetization of pillow basalts, revealing a very stable high-coercivity remanence up to 150 mT. C. AF demagnetization of massive basalts, showing a rapid decreasing in intensity and highly scattered directions when AF demagnetization is >10 mT.

Figure F6. Representative demagnetization diagrams of Leg 187 samples. The samples were not oriented. A. Thermal demagnetization of pillow basalts, showing a stable direction of natural remanent magnetization (NRM) and high unblocking temperatures up to ~540°C. B. AF demagnetization of pillow basalts, revealing a very stable high-coercivity remanence up to 150 mT. C. AF demagnetization of massive basalts, showing a rapid decreasing in intensity and highly scattered directions when AF demagnetization is >10 mT.