Abstract
Measurement of low-frequency magnetic susceptibility in sediments from several lakes showed that a diagenetically formed magnetic mineral can contribute a significant amount to the intensity of bulk magnetic measurements on anaerobic sediments from productive lakes. A single ferrimagnetic mineral containing stable single domains is responsible. Sequential chemical extraction showed that the mineral is not a carbonate, phosphate or partially reduced oxide. Comparison of changes in magnetic properties with changes in sulphide concentrations suggests that the mineral concentration covaries with sulphide but is not actually a simple iron monosulphide.
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