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Soil Science Society of America Journal Abstract -

Weathering of Biotite in Soils of a Humid Tropical Climate1


This article in SSSAJ

  1. Vol. 37 No. 4, p. 644-646
    Received: Aug 21, 1972
    Accepted: Feb 26, 1973

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  1. A. G. Ojanuga2



The weathering of biotite in soils formed in saprolites derived from granite and gneiss was studied. The soils occurred in the Southwestern Upland of Nigeria which is characterized by a humid tropical climate.

Vermiculite and montmorillonite are the usual products of biotite weathering in well-drained temperature soils, whereas kaolinite appears to be the dominant product in the well-drained, moderately acidic, tropical soils studied. The formation of kaolinitic pseudomorphs represented a stage in the kaolinization of biotite in the soils. A mechanism for the kaolinization of biotite has been suggested.

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