An evaluation of slump fold formation using palaeomagnetic techniques

Distorted bedding and soft-sedimentary deformation structures are abundant at the base of the Late Miocene Pannonian sequence, due to rapid basin subsidence and high sedimentary input. A well-preserved slump fold was observed at a depth of 1341 m in Iharosberény I. core hole, SW Hungary. Detailed palaeomagnetic analysis of this fold indicated that the magnetic grains rotated to a certain degree during folding, but the rock has not been remagnetized during and after folding. It is concluded that remanent magnetization was acquired soon after deposition and before folding.