緒言 –地球化学における地球化学図の役割 [in Japanese] Introduction: Role of geochemical map in geochemistry [in Japanese]
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Geochemical map represents the concentration pattern for different elements in the surface media, for example, rocks and soils. Stream sediments are considered to be complementary to soils. The sediments are a composite sample of weathered material upstream from the sampling site. Sampling density varies from 1 sample per 1km<sup>2</sup> (stream sediment in Japan) to 1 per 320km<sup>2</sup> (till in Finland). A wider spaced sampling has been accepted in some cases. Geochemical map is expected to provide useful information on mineral exploration, environmental pollution as well as agricultural applications.
Chikyukagaku 25(2), 69-71, 1992
The Geochemical Society of Japan