The eolian origin of silty mantle in sedentary soils from Korea and Japan

Heavy dust fall in Beijing, on April 16-17, 2006: Geochemical properties and indications of the dust provenance

“…Analyses show that maxima in the curves of cumulative quartz percentages decrease gradually from Korea's western coast (22-28 µm) to its eastern regions (14-19 µm), with further decreases in the samples from Japan (12-15 µm) (Mizota et al, 1991). In contrast, the maxima of 2006 Beijing dust samples vary from 28 to 32 µm (Table 2, Fig.…”

“…Eolian dust found in Korea and Japan has been carried long-distances from the interior of China where it had formed the sedimentary soils (Mizota et al, 1990(Mizota et al, , 1991. Analyses show that maxima in the curves of cumulative quartz percentages decrease gradually from Korea's western coast (22-28 µm) to its eastern regions (14-19 µm), with further decreases in the samples from Japan (12-15 µm) (Mizota et al, 1991).…”

“…Quartz grains of 1-10 µm size from the 2006 Beijing dust samples vary from 9.50% to 13.46% (Table 2); whereas the eolian sediments of Korea and Japan have mean contents of 29.80% and 41.86% respectively (Mizota et al, 1991). With increasing east longitude toward the central Pacific and Hawaii Islands, the pelagic sediments and soils that are thought to have eolian sources are dominantly 1 to 10 µm (Rex et al, 1969;Jackson et al, 1971;Clayton et al, 1972;Rea, 1994).…”

Mineralogical properties of andisols of the Kitakami mountain range, Northeastern Japan

“…Adj adeh and Inoue (1999) had reported that the age of the tephras deposited at the three parts of the mountain range determined, to a large extent, the magnitude of eolian dust contamination in the soils. The median diameter of the soil particles contained in long-range eolian dust deposited in Japan was reported to range from 3 to 20 ,urn (silt-sized) (Inoue andNaruse 1987, 1991 no studies showed that quartz isolated from some soils in Japan was of long-ran~e eolian dust origin (Mizota 1982;Naruse et al 1986;Mizota et al 1991). Thus, our results suggest that the influence of long-range eolian dust was much more stronger at the southern part of the mountain than at the northern and central parts.…”

“…Recent studies have shown that 2:1 and 2:1:1 clays (Inoue andNaruse 1987, 1991;Mizota and Inoue 1988;Zhang et al 1994) and fine-grained quartz (Mizota 1982;Mizota and Takahashi 1982;Mizota et al 1991;Naruse et al 1986) found in volcanic ash soils in Japan originate from tropospheric eolian dust transported from China. Thus, the objectives of this study were to examine (i) the composition of the exchange complexes of representative pedons of the three parts of the mountain range, (ii) the silt-sized quartz content of the soils, and (iii) the relationship between these properties and the composition of the parent materials of the soils.…”