Abstract
In geochemical surveys, including those of lake sediments, it is convenient to classify logarithmic cumulative frequency distributions of elements as anomalous, background, or intermediate. The third, and commonest, group presents the dilemma - Is a given distribution in that group tending towards an anomalous or a background distribution? Data from a series of surveys suggest that the relationship of loss on ignition to metal tenor can be used as an indicator of an element's “potential” or “availability” in the region of the survey. In turn, increased availability implies an anomalous source, such as an ore deposit. Areas with the best potential are considered to be those where logarithmic cumulative distributions of particular elements have the same or greater positive slopes than the associated loss on ignition distribution. The method does not define areas within the survey that can be considered more anomalous, only whether or not the given survey area exhibits a greater than expected concentration of a given element.
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