In geology, Eluvium or eluvial deposits are those geological deposits and soils that are derived by in situ weathering or weathering plus gravitational movement or accumulation. World geologic provinces Oceanic crust  0-20 Ma  20-65 Ma  >65 Ma Geologic provinces  Shield  Platform  Orogen  Basin  Large igneous province  Extended crust Geology (from Greek γη- (ge-, the earth) and λογος (logos, word, reason))[1] is the science and study of the solid matter of a celestial body, its composition... Loess field in Germany Soil horizons are formed by combined biological, chemical and physical alterations. ... Weathering is the process of breaking down of rocks, soils and their minerals through direct, or indirect contact with the atmosphere. ...

The process of removal of materials from geological or soil horizons is called eluviation. There is a difference in the usage of this term in geology and soil science. In soil science, eluviation is the transport of soil material from upper layers of soil to lower levels by downward precipitation of water across soil horizons, and accumulation of this material (illuvial deposit) in lower levels is called illuviation. ^{[1] [2]} In geology, the removed material is irrelevant, and the deposit (eluvial deposit) is the remaining material. Soil science deals with soil as a natural resource on the surface of the earth including soil formation, classification and mapping; physical, chemical, biological, and fertility properties of soils per se; and these properties in relation to the use and management of soils. ... This article or section does not cite its references or sources. ... Illuvium is material displaced across a soil profile, from one layer to another one, by the action of rainwater. ... Illuvium is material displaced across a soil profile, from one layer to another one, by the action of rainwater. ...

Eluvial ore deposits are those such as tungsten and gold placer deposits formed by settling and enriched by the winnowing or removal of lower density materials. Diamonds within yellow ground (weathered portions of kimberlites) may be considered to be eluvial deposits. Cassiterite and columbite-tantalite deposits also occur as residual or eluvial concentrations. The Pitinga tin deposit in Brazil, an eluvial deposit, is one of the largest tin mines in the world. Weathering supergene enrichment of an apatite rich carbonatite in Ontario has produced a significant eluvial phosphate ore deposit. Iron ore (Banded iron formation) Manganese ore Lead ore Gold ore An ore is a volume of rock containing components or minerals in a mode of occurrence which renders it valuable for mining. ... General Name, Symbol, Number tungsten, W, 74 Chemical series transition metals Group, Period, Block 6, 6, d Appearance grayish white, lustrous Atomic mass 183. ... General Name, Symbol, Number gold, Au, 79 Chemical series transition metals Group, Period, Block 11, 6, d Appearance metallic yellow Atomic mass 196. ... In geology, a placer deposit is a deposit of earth, sand, or gravel, containing valuable minerals in particles, especially by the side of a river, or in the bed of a mountain stream. ... // A scattering of round-brilliant cut diamonds shows off the many reflecting facets. ... Hewn kimberlite core sample from the James Bay Lowlands region of Northern Ontario, Canada. ... Cassiterite is a tin oxide mineral, SnO2. ... Coltan (columbite-tantalite) is a black tar-like mineral. ... ske| Fracture|| Conchoidal to even Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite, and chlorapatite, named for high concentrations of OH-, F-, or Cl- ions, respectively, in the crystal. ... Carbonatites are intrusive igneous rock structures with more than 50% carbonate content, many of which contain distinctive abundances of apatite, magnetite, barite, and fluorite, that may contain economic or anomalous concentrations of rare earth elements, phosphorus, niobium, uranium, thorium, copper, iron, titanium, barium, fluorine, zirconium, and other rare or incompatible... Motto: Ut Incepit Fidelis Sic Permanet (Latin: Loyal she began, loyal she remains) Official languages None Flower White Trillium Tree Eastern White Pine Bird Common Loon Capital Toronto Largest city Toronto Lieutenant-Governor James K. Bartleman Premier Dalton McGuinty (Liberal) Parliamentary representation  - House seats  - Senate seats 106 24 Area Total... Above is a ball-and-stick model of the inorganic hydrogenphosphate anion (HPO42−). Colour coding: P (orange); O (red); H (white). ...

References

1. ^ Glossary of Soil Science Terms. Soil Science Society of America. Retrieved on 2006-11-10.
2. ^ Glossary of Terms. PhysicalGeography.net. Retrieved on 2006-11-11.

• Gupta, Chiranjib Kumar (2002) Chemical Metallurgy: Principles and Practice, Wiley, ISBN 3-527-30376-6
• Cronan, David Spencer (1999) Handbook of Marine Mineral Deposits, CRC Press, ISBN 0-8493-8429-X
• Swiecki, Rafal (2006) Eluvial Placers Accessed 18 April 2006
• Van Hees, Edmond H., (2002) SUPERGENE PHOSPHATE ENRICHMENT IN CARBONATITE-DERIVED ELUVIAL SEDIMENTS: AGRIUM PHOSPHATE MINE, KAPUSKASING, ONTARIO, CANADA, The Geological Society of America (GSA) abstract. Accessed 18 April 2006