Magnetic studies have been performed on 23 specimens of oceanic basalts from boreholes 338 and 342 (38th leg of the Glomar Challenger, 1974), which reveal alternation in the signs of the magnetic deviation $j_0$ for the natural residual magnetization vector $I_n$ with depth. The most likely reason for the forward magnetization of a quarter of the specimens is self-reversal of $I_n$ in situ by a magnetostatic mechanism. The reverse-magnetized basalts were produced in fields of the corresponding polarity.
Department of Earth Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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