Abstract
The low-temperature ( K 1) transition has been measured in prepared samples with a low concentration of magnetite to test the validity of the technique for identifying magnetite in weakly magnetized rocks. Using an astatic magnetometer, magnetite concentrations as low as 1 part in 100,000 can be satisfactorily detected. Measurements on natural samples show the presence of magnetite in a variety of limestones which are known to have a stable natural remanent magnetization.
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