Abstract Stream sediment survey or soil survey was adopted during the 1∶200 000 regional geochemical exploration in Inner
Mongolia. The coarse sampling grade has performed well in the geological mineral resource prospecting. However, the prospecting
is to some extent affected by local landscape. Geochemical elements in stream sediments from southern China are distributed in a
“U”-shaped pattern, which indicates the difference in weathering types and correspondingly the difference in sedimentary
materials between northern and southern China. Both the coarse and the fine grade samples can probably reflect the anomalies, and
therefore the -5~+20 meshes(-4~+0.9 mm)and the -120 meshes (-0.125 mm) samples should be adopted during exploration. For
improving the working efficiency, even the -5 meshes (or -20 meshes) whole grade grains can be adopted. In this way, more
exploration information can be acquired. This key sampling technology can also be applied to stream sediment survey or soil
survey of different scales for various landscapes in China.
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