黒ボク土および石灰岩・玄武岩台地上の赤黄色土の2 : 1型鉱物と微細

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High-quantity illite and quartz bands which are centered in the mid-latitude in the North Pacific pelagic clays are an indication of world-wide tropospheric eolian input from the arid and semi-arid regions such as the Takla Makan and Gobi deserts and Loess Plateau in China. Japanese islands are located under frequent transport paths of Asian dust. Asian tropospheric eolian dust is characterized by the predominance of soil particles of 30 to 3μm in diameter, and its dominant minerals in the silt and clay fractions are 2 : 1 layer silicates, kaolinite and quartz. Dust flux from atmosphere to Japanese islands was more prominent in the last Glacial period than in modern times. Nonallophanic Andosols, Red-Yellow soils developed on limestones, basalts, terraces and Tertiary deposits, paleosols buried in Paleo-sand dunes, and inorganic components of peats in Japan and Korea showed the similar particle size distribution, chemical and mineralogical characteristics to eolian dust collected in Japan and loess and loess-derived soils in China. Oxygen isotope abundance of the marker quartz (1-10μm) isolated from the soils and eolian dust revealed that the fine-grained quartz and associated 2 : 1 layer silicates in the soils were tropospheric eolian origin and it seems that there are no possibilities of their pedogenic formation from parent materials such as volcanic ash, limestone, and basalt. The current results show that eolian dust influence is wide-spread in various kinds of soils in Japan and Korea, which have existed for 10^3 to 10^4 years.
日本粘土学会の論文
1988-04-10

黒ボク土および石灰岩・玄武岩台地上の赤黄色土の2 : 1型鉱物と微細

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