Project GAMBLE: Ground‐based and airborne magnetic boundary layer experiments

Abstract

One of the main goals of paleomagnetic studies is to produce evidence for ancient continent displacements and thus produce paleogeographical reconstructions of the earth in the geological past. To achieve this goal, paleomagnetists use the direction of remanent vectors as measured in rocks to derive latitudinal and azimuthal data, according to the model of the Earth magnetic field (EMF). One of the many difficulties faced by these researchers is the determination of whether the rock deformation may have altered the original paleomagnetic direction. If so, the paleomagnetists must correct the effect of such a deformation. Obviously, this aspect is of secondary importance in cratonic areas where beds lie flat or are gently folded, and in earlier times, most paleomagnetic studies were conducted in such areas. However, it now appears that we cannot avoid work within orogenic belts if we want to resolve geodynamic problems [Van der Voo and Channel, 1980]. It therefore became necessary to examine more carefully the interaction between magnetizations and deformation. During the last decade, several teams have conducted research efforts in this direction.