Letter | Published:

Laboratory-induced self reversal of thermoremanent magnetisation in pillow basalts

Naturevolume 257pages117118 (1975) | Download Citation



CONSIDERABLE attention has been paid to the changes in the magnetic properties of pillow lavas with distance from a ridge1. It has been found2,3 that the originally stoichiometric titanomagnetites are altered at sea-floor temperatures to cation-deficient titanomagnetites (titanomaghaemites). The degree of cation deficiency—the fraction of initial Fe2+ oxidised to Fe3+—is described by the parameter ‘z’ (ref. 4). As the titanomaghaemite evolves, all the magnetic properties (for example, Curie point, saturation magnetisation, coercive force) change, but though the changes cause a decrease in the intensity of magnetisation, the direction is preserved.

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  1. Department of Geology, Dalhousie University, Halifax, Nova Scotia, Canada

    •  & J. M. ADE-HALL


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