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Taking into account the DSDP Leg 94 site survey and drilling results, a review of the magnetic data from the flanks of King's Trough has led to analysis of 12 tracks running subparallel to the feature. Magnetic anomalies have been projected as profiles on an azimuth of 110°, coincident with the regional trend of magnetic lineations. Comparison of the profiles with a reversal chronology model has shown unambiguous anomaly identifications to the north which extend close to the Trough on its north flank. South of the Trough the anomaly sequence is less clear. Anomaly identifications across King's Trough have previously been used as evidence of dextral offset. This chapter, however, follows recent studies suggesting that a dextral offset of up to 45 km exists on a fracture zone just to the south, and implying that the Trough itself shows no offset along its axis. Studies reported here have expanded that interpretation to incorporate the dating control of Leg 94 Site 608 into the model. The results define the position of a transform, probably in existence during the period between Anomalies 31 and 18, encompassing the early part of the Pyrenean convergence. In addition, other discontinuities are shown to have existed in the magnetic lineations north and south of King's Trough during the same interval. These predate the later Miocene tectonic events responsible for subsidence of the crust that makes up the King's Trough basins, after its formation from a hot spot.

Correlation of Seafloor Spreading Magnetic Anomalies across King's Trough, Northeast Atlantic Ocean