Weathering of Biotite in Soils of a Humid Tropical Climate1
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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