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Self-reversal, the remarkable ability of some rocks to acquire a magnetization antiparallel to the Earth's magnetic field, was of great interest in the 1950s and 1960s, but it was subsequently found to be rare, limited to a few hemoilmenite-bearing igneous rocks. Here we show through thermal demagnetization experiments that pillow basalts from the northwestern Pacific Ocean lacking hemoilmenite contain...
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