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Eluvium |
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eluvium [ē′lü·vē·əm]
(geology) Disintegrated rock material formed and accumulated in situ or moved by the wind alone. Eluvium loose deposits that occur when the original (parent) rock weathers at its place of origin. The eluvium comprises weathering crusts and soils. A distinction is made between the orthoeluvium of crystalline (magmatic and metamorphic) rocks, the metaeluvium of consolidated sedimentary rocks, and the neoeluvium of young, unconsolidated deposits (in the last two cases, the parent rocks consist largely of redeposited and slightly altered products of weathering). The most characteristic type is orthoeluvium, which ranges in composition from pebbles and boulders in cold climates to clays in hot, humid climates. On the basis of degree of decomposition, a distinction is made between siallitic eluvium, in which the original aluminosilicates are preserved; acidic siallitic eluvium, which is composed chiefly of newly formed hydrous aluminosilicates of the group of clay minerals; and allitic, or ferralitic, eluvium, in which a significant share of the silicates have decomposed and are represented by free hydroxides of aluminum and iron. E. V. SHANTSER Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Labelmate Eluvium, the stage name of Portland-based ambient musician Matthew Cooper, will open the show at 9 p. Raymor plans to install a high capacity washing system for recovering "nuggety" gold in the eluvium as soon as its tests to determine how to recover as much as possible are completed. Twyman, geological consultant, has been on site to start the programme and reports finding several areas of artesanal gold mining of eluvial/colluvial material (eluvial material is surface material that is derived from the weathering (rotting) of bedrock and colluvial material is eluvium that has moved down-slope but is probably not very distant from its source). |
Eluvium |
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