MINERALOGY OF SURFACE SEDIMENT IN THE EASTERN AREA OFF THE RYUKYU ISLANDS AND ITS GEOLOGICAL SIGNIFICANCE
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摘要: 以X射线衍射仪为主要手段,对琉球群岛以东海域调查区表层底质沉积物中全样矿物组分进行分析和研究,结果表明本区共识别出9种矿物:蒙皂石、伊利石、云母、高岭石、绿泥石、石英、钾长石、斜长石、方解石。分析其沉积物由3种主要物质来源:陆源物质、火山物质、生物碎屑物质等组成。Abstract: The mineral composition of the bulk samples of the surface sediment in the eastern area off the Ryukyu Islands is studied with X-ray diffraction(XRD). It is found that the sediment consisting of smectite, illite+mica, kaolinite+chlorite, quartz, potash feldspar, plagioclase and calcite, is dominated by quartz, illite+mica, calcite and plagioclase, and kaolinite+chlorite and smectite occupy the second place with potash feldspar occasionally observed. According to the mineral composition, it is deduced that the sediment came from terrigenous, volcanic and biogenic sources.
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