What are the geochemical prospecting method? Values within the threshold values are referred to as background values and those above or below as anomalies. Traditionally, geochemical anomalies have been identified by setting threshold values, which mark the upper and lower limits of normal variation for a particular population of data.

Hawkes and Webb (1962) defined background as (1) “the normal abundance of an element in barren earth material” and concluded “it is more realistic to view background as a range rather than an absolute value”. The term ‘geochemical background’ comes originally from exploration geochemistry. In mineral exploration interest is generally in positive anomalies, on the assumption that ore deposits and their weathering have increased element abundances above normal crustal levels. Geochemical anomalies are geochemical features different from what is considered normal.

How are geochemical anomalies identified in CRC LEME?.

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