Eluvium
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In geology, eluvium or eluvial deposits are geological deposits and soils that are derived by in situ weathering or weathering plus gravitational movement or accumulation.
The process of removal of materials from geological or soil horizons is called eluviation or leaching. 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 percolation of water across soil horizons, and accumulation of this material (illuvial deposit) in lower levels is called illuviation. In geology, the removed material is irrelevant, and the deposit (eluvial deposit) is the remaining material. Eluviation occurs when precipitation exceeds evaporation.
A soil horizon formed due to eluviation is an eluvial zone or eluvial horizon. In a typical soil profile, the eluvial horizon refers to a light-colored zone located (depending on context and literature) either at the lower part of the A horizon (symbol: Ae) or within a distinct horizon (E horizon) below the A, where the process is most intense and rapid. Yet some sources consider the eluvial zone to be the A horizon plus the (distinct) E horizon, as eluviation technically occurs in both.
The strict eluvial horizon (E horizon) is typically light gray, clay-depleted, contains little organic matter and has a high concentration of silt and sand particles composed of quartz and other resistant minerals.
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.
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- Turiya (For the Birds Remix) - For the Birds: The Birdsong Project, Vol. III - Eluvium
- The Conditional - For the Birds: The Birdsong Project, Vol. III - Eluvium
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- Before the World - For the Birds: The Birdsong Project, Vol. III - Eluvium
- The Bird - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Strictly for the Birds - For the Birds: The Birdsong Project, Vol. III - Eluvium
- 136 Syllables at Rocky Mountain Dharma Center - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Mr. Sparrow - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Of Mere Being - For the Birds: The Birdsong Project, Vol. III - Eluvium
- The Little Bird - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Perth to Melbourne - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Dawn Revisited - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Hanover Birds - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Pinions of a Dove - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Flight to the Sun - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Altamira Oriole - For the Birds: The Birdsong Project, Vol. III - Eluvium
- The Day Is Done - For the Birds: The Birdsong Project, Vol. III - Eluvium
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- Hymn for Four Birds - For the Birds: The Birdsong Project, Vol. III - Eluvium
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- My Dove, To Sleep - For the Birds: The Birdsong Project, Vol. III - Eluvium
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- Morning Maggie - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Feather - For the Birds: The Birdsong Project, Vol. III - Eluvium
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- Thornbird - For the Birds: The Birdsong Project, Vol. III - Eluvium
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- Loon Song - For the Birds: The Birdsong Project, Vol. III - Eluvium
- To the New Year - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Ka - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Diamond Dove - For the Birds: The Birdsong Project, Vol. III - Eluvium
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- Kookaburra Boogie - For the Birds: The Birdsong Project, Vol. III - Eluvium
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- Far Rockaway - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Nightbird - For the Birds: The Birdsong Project, Vol. III - Eluvium
- Looking for Mushrooms at Sunrise - For the Birds: The Birdsong Project, Vol. III - Eluvium
- In May - For the Birds: The Birdsong Project, Vol. III - Eluvium
- For the Birds - For the Birds: The Birdsong Project, Vol. III - Eluvium
Virga II - 2021-08-06 00:00:00
Virga I - 2020-02-21 00:00:00
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