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Assuming appropriate sampling and analytical control, the geochemistry of surficial sediments in glaciated terrain should reflect sample to sample variations caused by the agency of glacial dispersal. The shape, size and geochemical expression of dispersal trains, however, is a function of a number of variables including ice dynamics, patterns of subglacial and ice-marginal sedimentation, size, aspect and erodibility of the source area, rate of dilution of mineralized debris, and scale of observation. Dispersal trains can be grouped into two broad endmembers: (1) fan to patch shaped trains characterized by a systematic decrease in concentration of source material both longitudinally along …
