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No.16 (1973/03) >

 
Title :Dissolution of Carbonates in Central OKINAWA, and TONAKI JIMA, the Ryukyu lslands
Authors :Kaneshima, Kiyoshi
Tokuyama, Akira
Authors alternative :兼島, 清
渡久山, 章
Issue Date :1-Mar-1973
Abstract :The differences on chemical and mineralogical compositions and the color of dark- and liaht-colored carbonates were explained by dissolution experiments. Sulfate contents and "K_2Cr_2O_7, consumption" in the dark-colored parts dissolved in the water or oxidized by hydrogen peroxide tend to converge to those of the lisht-colored. The ratio of peak height of X-ray diffractograms between magnesian calcite and dolomite decreases with increasing the ratio of magnesium to calcium (Mg/Ca) dissoled in the solution. In the first portion of the dissolution in flask with the flow of CO_2 gas and in the dissolution in column with dropping CO_2 -saturated water, the ratio of magnesium to calcium in the solution showed higher values than that in other portions and methods. Natural subaerial weathering mechanisms may be represented by the dissolution experiment in flask with the flow of CO_2 gas.
Type Local :紀要論文
Publisher :琉球大学理工学部
URI :http://hdl.handle.net/20.500.12000/23496
Citation :琉球大学理工学部紀要. 理学編 = Bulletin of Science & Engineering Division, University of Ryukyus. Mathematics & natural sciences no.16 p.120 -133
Appears in Collections:No.16 (1973/03)

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