The Remanent Magnetization of Unstable Keuper Marls

摘要: Measurements of the directions and intensities magnetization Keuper Marls from Sidmouth are described. The natural remanent these rocks is shown to be unstable in geomagnetic field. Certain laboratory experiments described which show consist three components, a primary component created on, or soon after, deposition, same direction as that Sandstones by Clegg, Almond & Stubbs (1954); secondary geocentric axial dipole field Britain acquired since last reversal main temporary built up between collection measurement. components believed isothermal magnetizations due red haematite cement. Application Neel’s theory small single-domain particles shows grains less than 0·15 μ diameter will magnetically unstable. explained terms theory. A suggested test stability