Much has been learned for the past 30 years from records of paleointensity relying on natural remanent magnetization
of sediments and lava flows, but large uncertainties persist and major features of the field remain poorly documented, pointing out the limits of the approach.
natural remanent magnetization
(NRM)) was measured using either the AGICO JR-6A spinner magnetometer or 2G Superconducting Rock Magnetometer 755 (SQUID), and the magnetic susceptibility ([chi]) was checked with the AGICO KLF-4A Automatic Magnetic Susceptibility Meter.
Magnetic susceptibility, saturation isothermal remanent magnetization, natural remanent magnetization
, electrical resistivity, dielectric constant, wet P-wave velocity, effective porosity, and wet, dry and grain densities were measured in the Petrophysical Laboratory of Research Institute of Earth Crust of St.
Apparent density and magnetic susceptibility were measured before measuring the behaviour of the natural remanent magnetization