Abstract
Certain Brazilian latosols show a spontaneous magnetization of the clay size fraction in excess of 1 J/T kg: they can be picked up by a hand magnet. Magnetization is a good indicator of soil type, being greatest in those soils derived from mafic or itabiritic rocks which have been little influenced by xanthization (the soil yellowing process). The magnetic phase is fully-oxidized titanomaghemite which is inherited directly from weathered bedrock. Simple magnetic measurements are recommended as an aid in classifying tropical latosols.
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