1. The process by which soil materials (such as clay, iron oxide, or organic matter) are transported downward through the soil and deposited in a lower layer.
Usage: soil science; geology

Examples

• Illuviation occurs when water percolates through the upper soil layers, carrying dissolved and suspended particles downward.
• The B horizon of a soil profile often shows evidence of illuviation, with accumulated clay and minerals.
• Geologists study illuviation to understand soil development and nutrient distribution.
• Iron oxide illuviation can create distinctive color patterns in soil cross-sections.
• The process of illuviation is essential for the formation of mature soil horizons.