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No.71 (2001/3) >

Title :Particle size distribution, minerals and chemical composition of red soils from silicate rock area of Central Okinawa
Authors :Vuai, Said Ali
Tokuyama, Akira
Tokashiki, Yoshihiro
Shimo, Moritaka
Authors alternative :渡久山, 章
渡嘉敷, 義浩
Issue Date :Mar-2001
Abstract :The study was conducted to determine the characteristic of Kunigami mahji from central part of Okinawa Island. The samples were collected from Gushikawa recreation center (GRC) and nearby Royalgolf (RG). Particle size distribution, mineralogy of clay, silt and fine sand and chemical composition experiments were carried out. The influence of soil erosion to amend distribution of particles and soluble cations was observed in surface sample from GRC. Pure, intergrade and irregular mixed layer minerals were found. In RG sample even in fine sand clay minerals were observed. We assumed that weathering have proceeded more in GRC than in RG sample. This is also supported by the difference of their chemical compositions. The ratios of oxides of soluble cations (alkalis and alkaline earth) to that of insoluble (Al, Fe and Si) were very higher for RG (0.042) than for GRC (0.011). Chlorite widely appeared in RG sample and only once as vermiculite-chlorite intergrade mineral in GRC, hence suggests that samples were formed from different parent materials.
Type Local :紀要論文
ISSN :0286-9640
Publisher :琉球大学理学部
URI :http://hdl.handle.net/20.500.12000/5429
Citation :琉球大学理学部紀要 = Bulletin of the College of Science. University of the Ryukyus no.71 p.71 -77
Appears in Collections:No.71 (2001/3)

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