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The Curie temperatures and thermomagnetic behavior of the whole rocks, as well as the titanium content and microscopic features of titanomagnetite contained in the rocks, were studied on the same samples used for shipboard determinations of paleomagnetic properties. At least one (usually much more than one) sample was available from each lithologic unit of the basement rocks. A particular aim of the studies was to find any intersite variations of magnetochemical properties, such as variations with distance parallel to and perpendicular to the northern Mid-Atlantic and Reykjanes ridges. We also looked for variations with depth in the holes, such as might be caused by differences in magmatic differentiation or hydrothermal alteration. The major ferromagnetic phases, which are presumably responsible for the natural remanent magnetization and the marine magnetic anomalies, were carefully identified. The findings of the thermochemical magnetic study are correlated with rock magnetic and paleomagnetism results in the final chapter.

Magnetic Mineralogy of Basalts from Leg 49