An example is that gold deposits this way are smoothed and are ground down the further from the source. Alluvial deposits are usually most extensive in the lower part of a river’s course, forming floodplains and deltas, but they may form at any point where the river overflows its banks or where the flow of a river is checked. The soil in those situations is alluvial, and its extreme fertility often induces unfortunate people to reside in them. This article was most recently revised and updated by, https://www.britannica.com/science/alluvial-deposit. Alluvium is typically made up of a variety of materials, including fine particles of silt and clay and larger particles of sand and gravel. The Complete Real Estate Encyclopedia by Denise L. Evans, JD & O. William Evans, JD. Definition of alluvial deposit in the Definitions.net dictionary. Alluvial is a term that refers to soil sediments and the various sand, silt, gravel, clay or other deposited matter left behind by flowing water. Alluvial deposits are usually most extensive in the lower part of a river’s course, forming floodplains and deltas, but they may form at any point where the river overflows its banks or where the flow of a river is checked. Meaning of alluvial deposit. An alluvial plain is a largely flat landform created by the deposition of sediment over a long period of time by one or more rivers coming from highland regions, from which alluvial soil forms. The potential reserves seem to be very important, in calcareous sites as well as in alluvial deposits. 1. alluvial deposit - clay or silt or gravel carried by rushing streams and deposited where the stream slows down. Alluvium Alluvium is loose, unconsolidated soil or sediments, which has been eroded, reshaped by water in some form, and redeposited in a non-marine setting. Thesaurus: synonyms and … alluvium The material deposited on land by virtue of the process of accretion. Alluvial-Fan Deposit, Debris flow dominant. Alluvium is typically made up of a variety of materials, including fine particles of silt and clay and larger particles of sand and gravel. Alluvial groundwater means water located below the land surface within the Quaternary hydrostratigraphic unit that borders or underlies major perennial and intermittent streams in the Tongue River and Rosebud Creek basins.This unit is composed of unconsolidated alluvial deposits of clay, silt, sand, and gravel. Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... …in three types of deposits: alluvial gravels, glacial tills, and kimberlite pipes. They contain most of the world’s supply of tin ore, as well as, in some regions, gold, platinum, and gemstones. Alluvium (from the Latin alluvius, from alluere, "to wash against") is loose, unconsolidated (not cemented together into a solid rock) soil or sediment that has been eroded, reshaped by water in some form, and redeposited in a non-marine setting. Usage Examples. Origin: L, neut. Colluvianation is the process where sheet erosion, water erosion, downward creep, or a combination of all transport loose unconsolidated debris from hill tops to the base of the slope depositing different types of heterogeneous rocks and debris of varying sizes, and forming what is called a colluvium. It consists of silt, sand, clay, and gravel, as well as much organic matter. The … All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. The accretion process occurs when rivers or other waters deposit silt and mud on land,and thus create more land; the silt and mud making up the new land is called alluvium. Alluvial is the name for placer deposits formed by water action in a stream or river. Of alluvius. : The gold in such alluvial deposit tend to be distributed through a complete vertical section. The pipes themselves are often less than 100…. Let us know if you have suggestions to improve this article (requires login). Thus the heavy minerals Rivers constantly carry sedimentary materials along their course, usually the result of erosion. Alluvium (from the Latin alluvius, from alluere, "to wash against") is loose, unconsolidated (not cemented together into a solid rock) soil or sediments, which has been eroded, reshaped by water in some form, and redeposited in a non-marine setting. Some alluvial deposits are a rich source of diamonds. Noun. They occur in most regions of Australia and are a major resource for irrigation, town, stock and domestic uses. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. The country's alluvial diamond fields are … adjective. The majority of these materials are picked up in areas of the river where the water runs very quickly and has more force. Alluvial deposit, Material deposited by rivers. alluvial deposit alluvial deposits. Soil — the geological substratum is made up of alluvial deposits from the disintegration of limestone. : L'or dans tel dépôt alluvial a tendance être distribué à travers la section verticale complète. Alluvial mining definition: a method of extracting minerals by dredging alluvial deposits | Meaning, pronunciation, translations and examples Updates? Type of: deposit, sediment. For most people, it’s all about alluvial deposits, or to be blunt, the allure of gold, with the odd precious and semi-precious gem thrown into the mix. Definition of alluvial. : Le sol est essentiellement volcanique et alluvial. What does alluvial deposit mean? Deposits of earth, sand, gravel, and other transported matter, made by rivers, floods, or other causes, upon land not permanently submerged beneath the waters of lakes or seas. There is a group of valleys all round them, and alluvial beds accumulate in them. 1. Alluvial deposit, Material deposited by rivers. “Alluvial gold” refers to the type of gold dust found in that kind of soil. What does alluvial mean? The noun ALLUVIAL DEPOSIT has 1 sense: 1. clay or silt or gravel carried by rushing streams and deposited where the stream slows down. When this loose alluvial material is deposited or cemented into a lithological unit, or lithified, it is called an alluvial deposit. The nature of the soil is mostly volcanic and alluvial. An alluvial channel is a water channel made up of loose sediments called alluvium. Alluvium is the term used to describe sediments deposited by rivers. Settlers built their homes on the fertile alluvial land. When heavy, stable minerals are freed from their matrix by weathering processes, they are slowly washed downslope into streams that quickly winnow the lighter matrix. Word Family. The loose, alluvial soil was deposited over the millennia by the meanderings and floods of the Willamette River. Alluvial soils are soils which consist of earth and sand left behind on land which has been flooded or where a river once flowed. A floodplain is part of the process, being the smaller area over which the rivers flood at a particular period of time, whereas the alluvial plain is the larger area representing the region over which the floodplains have shifted over geological time. The kimberlite pipes (such as those at Kimberley, South Africa) form from intrusions of magma into the Earth’s crust and deliver diamonds and other rocks and minerals from the mantle. a deposit of sand, mud, silt, or gravel formed by flowing Not to be confused with: alluvion – overflow; flood eluvium – a deposit of soil, dust, or rock debris formed by the decomposition of rock In Scots law, the rule does not apply where there is a sudden transfer, called avulsio, such as the flooding of a river. Alluvial Gold (Deposited by water movement) and Eluvial gold (disintegration of rock at the site where it originates - not there through water movement) are essentially primary gold broken down by weathering and erosion and transported by gravity or water movement over many millenia of geological time. : the alluvial deposit of a stream where it issues from a gorge upon a plain or of a tributary stream at its junction with the main stream Illustration of alluvial fan Examples of alluvial fan in a Sentence Definition of Alluvial (a.) 1. detrital material deposited by running water [n -VIA or -VIUMS] Medical Definition of Alluvium. Settlers built their homes on the fertile alluvial land. Our editors will review what you’ve submitted and determine whether to revise the article. Many crops grow well in the rich alluvial soil. Definition of Alluvium. They yield very fertile soils, such as those of the deltas of the Mississippi, … The owner of the land acquires the new land. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Deposits of Recent time include colluvial sediments formed by weathering and mass movement processes, alluvial fan and floodplain deposits, eolian sands associated with active beaches on the west coast, and organic deposits. Plural alluviums alluvia Sand, silt, clay, gravel, or other matter deposited by flowing water, as in a riverbed, floodplain, delta, or alluvial fan. See Alluvious. Placer deposit, natural concentration of heavy minerals caused by the effect of gravity on moving particles. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. delta - a low triangular area of alluvial deposits where a river divides before entering a larger body of water; "the Mississippi River delta"; "the Nile delta". Many crops grow well in the rich alluvial soil. : The Ganges delta is rising as a result of alluvial deposits. Of, relating to, or found in alluvium. matter that has been deposited by some natural process. Alluvial fans are usually created as flowing water interacts with mountains, hills, or the steep walls of canyon s. Corrections? (adjective) Alluvial soil; alluvial gold. alluvial sediment, alluvium, alluvion. They yield very fertile soils, such as those of the deltas of the Mississippi, Nile, Ganges and Brahmaputra, and Huang (Yellow) rivers. They are made of alluvial deposits and have widths ranging from # to around # km The country's alluvial diamond fields are some of the richest in the world. https://www.thefreedictionary.com/alluvial+deposit, The soil of all the former states has the appearance of an, Upon the lower banks of the river, formed by the, One of these forts was the estate of the Great Dukes of Lithuania in the 13th century and thanks to the thick layer of, The major mineral composition for Lahore soil is Quartz, Muscovite and Clinochlore, which shows that the, The dashed lines are stratigraphic delineations within the, The compilation of geological data has resulted in the identification of proven and probable mining reserves in three separate sectors - the Main Stock deposit, the Wenot Lake deposit and an, The company operates 11 kimberlite pipes and 16, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, Purple tourmaline from Maraca, Mozambique, Dirhinus texanus (Hymenoptera: Chalcididae) from Utah, Crater escape; Garden is sucked into Ice Age hole, ENGINEERING GEOLOGICAL CHARACTERIZATION OF LAHORE SOIL, BASED ON GEOTECHNICAL TESTING AND MINERALOGICAL COMPOSITION USING X-RAY DIFFRACTION, Ground-penetrating radar as a tool for mapping the phreatic surface, bedrock profile, and alluvial stratigraphy in the Sabie River, Kruger National Park. 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