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Magnetic Viscosity of Submarine Basalts, Deep Sea Drilling Project, Leg 37

Magnetic viscosity or magnetic after effect is the increase or decrease of magnetization with time in a constant (eventually zero) applied field. These studies on the magnetic viscosity of submarine basalts have two main objectives: 1) to estimate the intensity of the induced magnetization carried in situ. Usually, it is assumed that the induced magnetization is given by \H where x is t n e magnetic susceptibility measured in a short time (less than 1 min in most cases) and H the intensity of the geomagnetic field at the site of drilling. This assumption is wrong if the growth of the induced magnetization with time is important. In this case, the induced magnetization resulting from the influence of the geomagnetic field since the beginning of the Brunhes epoch (0.7 m.y.) can be rather higher than the magnetization measured in short times. 2) to determine the relative importance of the viscous remanent magnetization (VRM) with respect to the primary remanent magnetization and the behavior of the VRM when affected by alternating magnetic fields. As VRM is probably the most important secondary magnetization in submarine lavas (Lowrie et al., 1973), both these points are of particular interest for interpreting the paleomagnetic data obtained from these rocks.