Abstract
Abstract Siderite concretions found in the perimarine Pleistocene sediments of the Campine Formation in northeast Belgium have a stable natural remanent magnetization which can be mainly attributed to magnetic carriers locked in during their growth. Room-temperature oxidation of the concretions resulted mainly in hematite which acquires a field-controlled, very stable crystalline remanent magnetization. Siderite samples heated in air did not show magnetic interactions between the dissociation products hematite and maghemite.
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