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No.22 (1976/09) >

 
Title :沖縄近海の石灰質海底沈殿物の化学成分と結晶構造
Title alternative :Geochemical Study on Marine Carbonate Sediments in OKINAWA
Authors :兼島, 清
渡久山, 章
知名, 定則
Authors alternative :Kaneshima, Kiyoshi
Tokuyama, Akira
China, Sadanori
Issue Date :28-Sep-1976
Abstract :The geochemical studies and X-ray analysis were conducted on marine carbonate sediments obtained from off-shores of Okinawa Island. The conglomerate or massive carbonate sediments are composed of 46.7 per cent of CaO and 4.0 per cent of MgO. These sediments contain, as impurities, relatively large amounts of silica, iron, aluminum and phosphate comparing with those of Riukiu limestone. Positive correlations appear to exist between iron, aluminum and phosphate contents. The amount of sandy sediments diminish rapidly at the particle size near 65 meshes. The calcium carbonate content of sandy sediments also depend largely upon the particle size showing to positive correlation, wherease silicate and heavy minerals increase in fine powder sediments. The conglomerate or massive carbonate sediments are composed of high-magnesian-calcite, aragonite and quartz. The cose sandy sediments are composed of high-magnesian-calcite, aragonite, low-magnesian-calcite and quartz, whereas fine sandy sediments contain large amounts of silicate and heavy minerals.
Type Local :紀要論文
Publisher :琉球大学理工学部
URI :http://hdl.handle.net/20.500.12000/23539
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.22 p.1 -13
Appears in Collections:No.22 (1976/09)

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