Abstract
Special features of linear marine magnetic anomalies and the magnetic measurements made on samples of the ocean crust require that the thickness of the marine magnetic source layer be thicker than the 0.5 km thick pillow lava layer (seismic layer 2A) alone. It is proposed here that the magnetic properties of the samples studied to date indicate a two-layered source to be the most likely: an upper 0.5 km thick pillow lava layer with a natural remanent magnetization of 5 A/m and a lower 3.5 km thick dike and upper gabbro layer with a magnetization of 0.5 A/m.
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