illuvial
Adjective (Geology, Soil Science): - Relating to illuviation: "Illuvial" describes material that has been deposited in a soil layer after being transported from an upper horizon by the downward movement of water. This process is called illuviation, and the resulting layer is an illuvial horizon (e.g., the B horizon in soil profiles).
- (Clay moved downward and was deposited in the B horizon.)
- (Deposits formed through illuviation are studied for historical climate and soil formation.)
"Illuvial horizon": A specific soil layer (typically the B horizon) where illuvial materials—such as clay, iron oxides, or organic matter—accumulate.
- The illuvial horizon in this podzol is rich in iron and humus. (The B horizon contains materials washed down from above.)
"Illuvial clay films": Thin coatings of clay on soil particles or pore surfaces, formed by illuviation.
- The presence of illuvial clay films indicates significant water movement through the soil profile. (These films are evidence of downward transport.)
Illuviation (n): the process by which materials are transported and deposited in a lower soil horizon by water percolation.
- Illuviation is a key process in soil horizon differentiation. (The movement and deposition of particles.)
Illuviate (v): to undergo or cause illuviation.
- Clay particles illuviate from the A horizon into the B horizon. (They move downward and accumulate.)
- Depositional (adj): relating to the laying down of material (general term, not soil-specific).
- Accumulative (adj): tending to gather or collect (broader sense).
- Eluvial (adj): referring to material that has been removed from a soil horizon by leaching or erosion (the opposite process).
- No common idioms exist for "illuvial," as it is a technical term primarily used in soil science and geology.