The outer rim of the Bucks batholith in northern California consists of a hornblende-biotite quartz diorite that contains both a reversely magnetized ilmenohematite (5 to 10 mol % ilmenite in solid solution with hematite) and a normally magnetized magnetite. It is argued that the ilmenohematite has self-reversed in some manner that is not reproducible in the laboratory. The mechanism for this self-reversal probably involves a negative exchange interaction between a Ti ordered phase and a Ti disordered phase.
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Merrill et al. (1969) studied this question.
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