Bulletin of the Geological Society of Malaysia, Volume 19, April 1986, pp. 443 – 451
Soil Science Department, Universiti Pertanian Malaysia, Serdang, Selangor, Malaysia.
Abstract: Some soils sampled from the alluvial plains of Kelantan, Trengganu, Johore, Perak and Kedah-Perlis were studied for their mineralogy. The deposits, believed to be of Holocene age, are termed as T2 terrace deposits. X-ray diffraction and thermal analyses showed that the clay fractions of these soils contain kaolinite, gibbsite, geothite, mica, chlorite, mixed layers and anatase. The dominance of kaolinite and sesquioxides is reflected by the low cation exchange capacity. The amount of gibbsite and anatase is related to the texture and drainage conditions. Above pH 5.5, kaolinite appears to control the buffering action of the soils. The studied soils are either in the recent or intermediate stage of weathering.