Thermal and Alternating Magnetic Field Demagnetization Experiments on Cainozoic Basalts from Victoria, Australia

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A re-examination of the palaeomagnetism of the Older Cainozoic Volcanics of Victoria has indicated that these rocks possess temporary unstable components of magnetization. Thermal demagnetization experiments show the magnetic mineral in these basalts is a titanomagnetite. A.c. cleaning experiments to remove the unstable components of magnetization are also described.     

Demagnetization of viscous moments

Summary. The theory of magnetism proposed by Walton is used-to produce models of magnetic viscous decay in an assembly of single domain grains of magnetite. These are then compared with data collected from carefully controlled viscosity experiments using 3 mm diameter cores of pottery whose major magnetic mineral is magnetite.