potassium anomaly (K%)
The potassium percentage map provides clues for identifying both regions with a high potassium content, due to the mineralogical composition of the rocks (for example, in a region with a strong presence of granite rocks) and the presence of erosive processes, since Potassium is a highly mobile element, also present in slopes, colluvium and alluvium, derived from rocks rich in potassium. This occurs because, during weathering, the main K is destroyed in the following order: 1. Biotite; 2. K-feldspar; 3. Muscovite. Potassium released over time can be absorbed into the formation of K-containing minerals such as illite or adsorbed in small amounts on other clay minerals (e.g. montmorilenite). (DICKSON; SCOTT, 1997).
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