Paleomagnetic reconnaissance study of the Flamanville Granite, with special reference to the anisotropy of its susceptibility

Abstract

For a preliminary paleomagnetic investigation of the Flamanville granite (Normandy, France), ten samples were studied. The granite samples had a weak remanent magnetization and a high magnetic susceptibility. The direction of the characteristic remanent magnetization was consistent with other Carboniferous paleomagnetic results from Stable Europe. The high magnetic susceptibility was distinctly anisotropic. The shape and orientation of the susceptibility ellipsoids were determined with the Utrecht astatic magnetometers, according to the method of As (1967). This method has been extended and its practical use is discussed. The orientation of the susceptibility ellipsoids could be interpreted in terms of the mode of emplacement of the granite.