Continental Deposits

continental deposits

[¦känt·ən¦ent·əl di′päz·əts]
(geology)
Sedimentary deposits laid down within a general land area.

Continental Deposits

 

deposits formed on land, including continental bodies of water such as lakes and rivers. Depending on the conditions under which the original sediment was accumulated and transformed, several types of continental deposits may be distinguished: surface, or subaerial, deposits; underwater, or subaqueous, deposits; and subglacial deposits, which develop under an ice cover. Depending on the dynamics of accumulation, conditions of bedding, and general structural patterns, different genetic types of continental deposits may be identified, classified into paragenetic groups and series according to the natural combinations that they form. Especially important is the eluvial series, comprising different types of eluvium, which makes up the crust of weathering and is a product of change in rocks caused by weathering at the place of their original occurrence.

All the other types of continental deposits are included in the group of sedimentary formations proper. They develop through the redeposition of the products of the breakdown of original rocks by agents of denudation or through the accumulation of products of the vital activity of organisms. The slope series is made up of deposits that develop at the base of slopes as their upper parts are denuded. There are five genetic types of slope deposits: avalanche (cave-in) accumulations, talus, landslide accumulations, solifluctions, and diluvium. The water series includes river deposits (alluvium), proluvium (deposits by temporary streams), and lake deposits. The glacial series consists of glacial deposits proper, or moraines; glacial-river, or fluvioglacial, deposits; and glacial-lake, or limnoglacial, deposits. The wind (eolian) series includes eolian sands forming dunes, barkhans, and other relief forms as well as eolian loess. The organogenic marsh deposits that form in caves and karst cavities and the calc-sinters, stalactites, and sediments of underground rivers and lakes constitute a special group. The “technogenic” deposits created by man, for example, mining heaps, embankments, and dams, constitute a separate group. Accumulations on land of volcanic tuffs and products of their redeposition are also included among continental deposits.

REFERENCE

Shantser, E. V. Ocherki ucheniia o geneticheskikh tipakh kontinental’nykh osadochnykh obrazovanii. Moscow, 1966.

E. V. SHANTSER

References in periodicals archive ?
In the interior, along the Levant Fracture System, lacustrine and continental deposits marked the Neogene.
Whereas in the Sogamoso, Umbita and Penas de Sutatausa sections, fluvial facies are prevalent in the upper part of the sections, and follow a regressive sequence with more continental deposits around the upper part of the sections.
This association of lithologic attributes is presented in Table 3, which shows a prograding sequence that characterizes the transition between transitional and continental deposits. The lithofacies association allowed the determination of the depositional environments and the depositional systems.
Continental deposits, including fluvial sandstone and mudstone and lacustrine-palustrine carbonates and evaporites, are more extensive in the lowermost part of the succession, being best developed in southwesternmost areas (Garcia de Cortazar and Pujalte, 1982; Lanaja and Navarro, 1987; Pujalte et al., 2004; and references therein).
In the Cantabrian graben continental deposits in the lower part pass gradually to tidal flat deposits (Pujalte, 1982; Garcia de Cortazar and Pujalte, 1982; Pujalte et al., 2004; and references therein).
Moreover, they also shed light on the biogeographic and stratigraphic evidences of these species and genera (Percrocuta and Adcrocuta) from the Siwalik continental deposits.
continental deposits. The collection of fossil material of Percrocuta carnifex from the Nagri Formation (11.2-9Ma) extends its stratigraphic range from Chinji Formation (14.2-11.2Ma) - Nagri Formation (11.2-9Ma).
Gravel deposits studied include the following: 1) The Cretaceous Tuscaloosa gravels of the Western Highland Rim; 2) The Pliocene (2) "Lafayette" gravels (Potter, 1955) or Continental deposits (Olive, 1980) of Henry County in Northwest Tennessee; and 3) Tennessee River Terraces, of undetermined age, that underlie Hardin, McNairy and Southern Decatur counties in Southwest Tennessee (Fig.
Titanohematites cropped up unexpectedly in the continental deposits of the San Juan and Big Horn basins.
In Lombardy, the lower cycle (cycle 1), up to 1500 m-thick, is made up of acidic to intermediate volcanics and alluvial to lacustrine continental deposits (Collio Formation, Ponteranica and Dosso dei Galli Conglomerates, and other lithosomes), both infilling intramontane fault-bounded subsiding basins isolated from each other by metamorphic and igneous structural highs.
At the scale of the western Europe peri-Tethyan basins, the lowermost part of the Mesozoic sedimentary cycle is composed of continental deposits generally described as "Buntsandstein".
This is the standard reference for biostratigraphic zonation of continental deposits of Early Permian age in Western Europe up to now.

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