1. alluvial deposit - clay or silt or gravel carried by rushing streams and deposited where the stream slows down. 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. 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. 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. The … an alluvial deposit that contains particles of some valuable mineral. Rivers constantly carry sedimentary materials along their course, usually the result of erosion. Placer deposit, natural concentration of heavy minerals caused by the effect of gravity on moving particles. Information and translations of alluvial deposit in the most comprehensive dictionary definitions resource on the web. Origin: L, neut. matter that has been deposited by some natural process. 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. Omissions? It consists of silt, sand, clay, and gravel, as well as much organic matter. Some alluvial deposits are a rich source of diamonds. 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. Alluvium is typically made up of a variety of materials, including fine particles of silt and clay and larger particles of sand and gravel. Thesaurus: synonyms and … 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. When this loose alluvial material is deposited or cemented into a lithological unit, or lithified, it is called an alluvial deposit. Of, relating to, or found in alluvium. 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. Alluvium is the term used to describe sediments deposited by rivers. What does alluvial mean? 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. An alluvial fan is a triangle-shaped deposit of gravel, sand, and even smaller pieces of sediment, such as silt. : L'or dans tel dépôt alluvial a tendance être distribué à travers la section verticale complète. 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. Definition of alluvial. Soil — the geological substratum is made up of alluvial deposits from the disintegration of limestone. (adjective) Alluvial soil; alluvial gold. This sediment is called alluvium . 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. Settlers built their homes on the fertile alluvial land. : The Ganges delta is rising as a result of alluvial deposits. An alluvial channel is a water channel made up of loose sediments called alluvium. adjective. 1. 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 is the name for placer deposits formed by water action in a stream or 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. The owner of the land acquires the new land. Plural alluviums alluvia Sand, silt, clay, gravel, or other matter deposited by flowing water, as in a riverbed, floodplain, delta, or alluvial fan. Alluvial-Fan Deposit, Debris flow dominant. Type of: deposit, sediment. The pipes themselves are often less than 100…. The potential reserves seem to be very important, in calcareous sites as well as in alluvial deposits. They are made of alluvial deposits and have widths ranging from # to around # km Definition of alluvial deposit in the Definitions.net dictionary. Usage Examples. Meaning of alluvial deposit. The noun ALLUVIAL DEPOSIT has 1 sense: 1. clay or silt or gravel carried by rushing streams and deposited where the stream slows down. It consists of silt, sand, clay, and gravel, as well as much organic matter. (Entry 1 of 2) : relating to, composed of, or found in alluvium alluvial soil alluvial diamonds. 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. They occur in most regions of Australia and are a major resource for irrigation, town, stock and domestic uses. alluvial sediment, alluvium, alluvion. the "alluvial deposit" family. Thus the heavy minerals Definition of Alluvium. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Updates? 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 fans are usually created as flowing water interacts with mountains, hills, or the steep walls of canyon s. “Alluvial gold” refers to the type of gold dust found in that kind of soil. 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. Definition of Alluvial (a.) The Complete Real Estate Encyclopedia by Denise L. Evans, JD & O. William Evans, JD. This article was most recently revised and updated by, https://www.britannica.com/science/alluvial-deposit. Alluvial deposit, Material deposited by rivers. Of alluvius. 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. The soil in those situations is alluvial, and its extreme fertility often induces unfortunate people to reside in them. Settlers built their homes on the fertile alluvial land. In Scots law, the rule does not apply where there is a sudden transfer, called avulsio, such as the flooding of a river. 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. They contain most of the world’s supply of tin ore, as well as, in some regions, gold, platinum, and gemstones. alluvio a form of accretion whereby the sea or a river retreats, enlarging one's property. Many crops grow well in the rich alluvial soil. The nature of the soil is mostly volcanic and alluvial. Our editors will review what you’ve submitted and determine whether to revise the article. The majority of these materials are picked up in areas of the river where the water runs very quickly and has more force. They yield very fertile soils, such as those of the deltas of the Mississippi, Nile, Ganges and Brahmaputra, and Huang (Yellow) rivers. The loose, alluvial soil was deposited over the millennia by the meanderings and floods of the Willamette River. Noun. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. 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. 1993 start-up for Omai, Guyana gold project? What does alluvial deposit mean? 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 Pertaining to, contained in, or composed of, alluvium; relating to the deposits made by flowing water; washed away from one place and deposited in another; as, alluvial soil, mud, accumulations, deposits. alluvial deposit alluvial deposits. Alluvial deposits are mixed with other deposits and are washed downstream in rivers or transported in among other sediments with water as its medium. There is a group of valleys all round them, and alluvial beds accumulate in them. Many crops grow well in the rich alluvial soil. An example is that gold deposits this way are smoothed and are ground down the further from the source. Alluvial mining definition: a method of extracting minerals by dredging alluvial deposits | Meaning, pronunciation, translations and examples Let us know if you have suggestions to improve this article (requires login). Corrections? 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". By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. : Le sol est essentiellement volcanique et alluvial. Word Family. Alluvial deposit, Material deposited by rivers. The country's alluvial diamond fields are … 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. 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. Alluvium is generally considered a young deposit in terms … 1. detrital material deposited by running water [n -VIA or -VIUMS] Medical Definition of Alluvium. They yield very fertile soils, such as those of the deltas of the Mississippi, … The country's alluvial diamond fields are some of the richest in the world. Alluvial deposits are sediments composed of gravel, sand, silt or clay deposited in river channels or on floodplains. alluvium The material deposited on land by virtue of the process of accretion. : The gold in such alluvial deposit tend to be distributed through a complete vertical section. : 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 See Alluvious. 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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