Experimental Pressure Demagnetization of Rocks up to 1.2 GPa

Mathematics – Logic

Scientific paper

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1595 Planetary Magnetism: All Frequencies And Wavelengths, 1599 General Or Miscellaneous

Scientific paper

Using a non-magnetic pressure cell, we carried out hydrostatic pressure demagnetization experiments up to 1.2 GPa on samples of meteorites and terrestrial rocks of different lithologies and on synthetic samples of dispersed powders of magnetite, hematite, pyrrhotite and iron. In these experiments A wide spectrum of different mineralogies (about 50 samples) was investigated to have a clearer picture of their pressure demagnetization behavior: pyrrhotite-, titanomagnetite- and FeNi-bearing meteorites; magnetite- and titanomagnetite-bearing terrestrial igneous rocks; and a variety of pyrrhotite-, hematite-, goethite- and greigite-bearing rocks. Under 1.2 GPa, these samples lost between 0 and 70% of their original saturation isothermal remanent magnetization. Although pressure demagnetization varies from one mineralogical group to the other, within each group the demagnetization at 1.2 GPa is a linear function of logBcr (coercivity of remanence).

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