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During Leg 147, in addition to measurements made on minicore samples, remanent magnetization of the archive half of the split core was measured using the cryogenic magnetometer. Magnetic susceptibility was measured on whole cores using the multisensor track aboard the JOIDES Resolution. High intensities of natural remanent magnetization were observed in the gabbroic rocks and the peridotites, which suggests that the lower oceanic crust to upper mantle section contributes significantly to the marine magnetic anomalies. Many of the measurements made on both the gabbroic rocks and the peridotites indicated the presence of secondary magnetizations probably acquired during drilling. The observed secondary magnetization is of mixed polarities regardless of the lithology. Similar values for the average stable inclinations obtained from both sites, which are significantly steeper than the expected value of zero, suggest that both sites experienced a similar post-cooling tectonic rotation with respect to the horizontal axis.

Paleomagnetism of Gabbroic Rocks and Peridotites from Sites 894 and 895, Leg 147, Hess Deep: Results of Half-Core and Whole-Core Measurements