Following microscopic study, concentrates of Fe-Ti oxide (predominantly titaniferous magnetite), ferromagnesian silicates (pyroxene plus subsidiary olivine) and plagioclase, were separated from crushed samples of (1) unoxidized and (2) oxidized Icelandic basalt. Saturation and thermal (SRM and TRM) remanent magnetism plus alternating field (AF) demagnetization, magnetic moment (J) vs magnetic field (H), and saturation magnetization (Js) vs temperature (T) were measured for these concentrates and for chips of each original rock. The results indicate that although minor amounts of ferrimagnetic oxides of distinctive composition are present in the silicates, the experimental (and presumably natural) RM in both rocks is predominantly associated with the primary oxide grains.

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First page of Magnetic Properties of Separated Mineral Phases in Unoxidized and Oxidized lcelandic Basalts
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