Mineralogy of the tropospheric dusts in rainwater collected in Fukuoka, Northern Kyushu

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Abstract
The mineralogical composition of the tropospheric dusts deposited by rainfall was examined during February to May, 1981 in Fukuoka. The dusts (0.5 to 37 mg/liter rainwater) contained quartz, mica, feldspar and some day minerals as common constituents. The dusts showed a definite mineralogical variation, serpentine minerals and talc witb appreciable amounts of amphibole being found in some. The mineralogical variation of the dusts during the collection periods was correlated with the surrace geology of the windward, arid to semi-arid regions in north China, from where the dusts derive. The integrated amounts of dusts incorporated by rainfall and dust storms (10 mm/102 years) indicated their importance to development of soil on old and stable landscape in northern Kyushu.

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