Where results make sense

About us   |   Why use us?   |   Reviews   |   PR   |   Contact us

Topic: Deposition (sediment)

    Note: these results are not from the primary (high quality) database.

USGS CMG InfoBank Geology School: deposition river, landscape, canyon, valley, meadow, delta, erosion, transportation, deposition, sediment "Dee Trent", "sedimentary rock", "clastic sediment", deposition, water, river, mountain, canyon, valley, "coarse grained sediment", "fine grained sediment", sandstone, siltstone, ocean, sand, shoreline, mud, clay "Walter E. Reed", "sedimentary rock", "clastic sediment", "sedimentary structure", deposition, "depositional environment", erosion, transportation walrus.wr.usgs.gov /infobank/programs/html/school/keypage/deposition.html   (923 words)

Deposition (geology) - Wikipedia, the free encyclopedia Deposition, also known as sedimentation, is the geological process whereby material is added to a landform. Deposition occurs when the forces responsible for sediment transportation are no longer sufficient to overcome forces of particle weight and friction that resist motion. Deposition can also refer to the build up of a sediment from organically derived matter or chemical processes. en.wikipedia.org /wiki/Deposition_(geology)   (154 words)

Episode One, Geology Department -- Bucknell University Even though the average rate of sediment accumulation was only millimeters per year, with deposition taking place over something like 200 million years, the total thickness of strata reached several kilometers (see diagram at right). The weight of the accumulating sediment caused the crust to subside continually so that depositional conditions were persistently shallow-marine. The geologic record of this episode in Pennsylvania is a thick sequence of sedimentary rocks that record the accumulation primarily of carbonate sediment (now limestones and dolostones. www.bucknell.edu /Academics/Colleges_Departments/Academic_Departments/Geology/Geology_of_Central_PA/Geologic_History/Geologic_History_Episode_1.html   (495 words)

Deposition (chemistry) - Wikipedia, the free encyclopedia Deposition is a term used in chemistry to describe the settling of particles or sediment from a solution or suspension mixture, or the production of a solid on a pre-existing surface. For example, a river mouth delta is formed by deposition of sediment carried by the stream as the river current diminishes upon encountering the sea. Deposition of particles is an aggradational process — one that builds a landform— as opposed to a degradational process that erodes or reduces the size of a landform. en.wikipedia.org /wiki/Deposition_(chemistry)   (129 words)

GLG 100 Ð Lecture 5-2 - Sedimentary rocks; Burial - slow burial of sediment by sinking of basin and deposition of overlying layers. Deposition - final cessation of transport and accumulation of sediments in layers. Caused by progressive decrease in speed of current, while sediment was being deposited. jan.ucc.nau.edu /~pju/lecture5-2.html   (129 words)

Chronic Beryllium Disease and Cancer Risk Estimates with Uncertainty for Beryllium Released to the Air from the Rocky Flats Plant Although we could have evaluated beryllium intake from ingesting vegetation subject to deposition from the air, livestock inhaling air, surface water, soil and sediment, livestock ingesting soil or sediment, vegetation grown in soil, and livestock ingesting vegetation grown in soil, these pathways would be expected to contribute only a small amount to overall risk. We calculated the concentration of beryllium in soil from airborne deposition at the location of highest deposition outside the buffer zone and east of the plant along Indiana Street. Meteorologic, deposition, and source term uncertainty were applied to each year's dose estimate. ehp.niehs.nih.gov /members/1999/107p731-744mcgavran/mcgavran-full.html   (11015 words)

DEPOSITION AND CHEMISTRY OF BOTTOM SEDIMENTS IN COCHITI LAKE DEPOSITION AND CHEMISTRY OF BOTTOM SEDIMENTS IN COCHITI LAKE, NORTH-CENTRAL NEW MEXICO By Jennifer T. Wilson and Peter C. Van Metre Bottom sediments were sampled at seven sites in Cochiti Lake in September 1996. DEPOSITION AND CHEMISTRY OF BOTTOM SEDIMENTS IN COCHITI LAKE Sediment cores penetrating the entire lacustrine sediment sequence were collected at one site near the dam. nm.water.usgs.gov /publications/abstracts/wrir99-4258.html   (190 words)

Glossary of Terms: D Sedimentary rock that is composed of particles transported to their place of deposition by erosional processes. Large deposit of alluvial sediment located at the mouth of a stream where it enters a body of standing water. Is a landform formed from the deposition of weathered and eroded surface materials. www.geog.ouc.bc.ca /physgeog/physgeoglos/d.html   (1679 words)

Sedimentary Mars The pancake-like layers of sediment compressed and cemented to form a rock record of the planet's history. Patterns like this, when found on Earth, usually indicate the presence of sediment deposited in dynamic, energetic, underwater environments. The uniform pattern -- beds of similar properties and thickness repeated over a hundred times -- suggest that deposition was interrupted at regular or episodic intervals. science.nasa.gov /headlines/y2000/ast04dec_2.htm   (1013 words)

Mineral Deposits -- Recommendations and Resources Deposition is a term used in chemistry to describe the settling of particles or sediment from a solution or suspension mixture, or the production of a solid on a pre-existing surface. Deposition of particles is an ''aggradational'' process — one that builds a landform — as opposed to a ''degradational'' process that erodes or reduces the size of a landform. In Christianity, the Deposition is the removal of Christ from the cross, at the Crucifixion. www.becomingapediatrician.com /health/98/mineral-deposits.html   (1501 words)

Géographie physique et Quaternaire : LATE QUATERNARY STRATIGRAPHY, CHRONOLOGY, AND DEPOSITIONAL PROCESSES ON THE SLOPE OF S.E. BAFFIN ISLAND, DETRITAL CARBONATE AND HEINRICH EVENTS: IMPLICATIONS FOR ONSHORE GLACIAL HISTORY Furthermore, sediment gravity flows are an important element of both erosion and deposition in this area. Sediment layers with high detrital carbonate are common in cores from the slope of SE Baffin Island. We suspect that sediment gravity flows may have resulted in the removal of the uppermost MIS 1 and 2 sediments. www.erudit.org /revue/gpq/1998/v52/n1/004762ar.html   (1501 words)

sedclass.html Sediment classification schemes should be designed to reflect the multi-component nature of most lake sediments and to lead to the recognition of the depositional environment of the sediment. Chemical sediment is composed of authigenic and diagenetic minerals that formed by inorganic processes such as precipitation from solution or colloidal suspension, by the deposition of insoluble precipitates or by the diagenetic alteration of previous minerals. The LRC sediment classification scheme is based on the recognition that lake sediments are genetically diverse, with components derived from a variety of sources, all of which may potentially yield important paleolimnologic information. lrc.geo.umn.edu /services/handbook/sedclass2.html   (1501 words)

NPS: Nature & Science» Geology Resources Division The outwash deposit is composed of stratified and sorted sand and gravel that represents an aggradational deposit of a large discharge of meltwater and sediment at and beyond the ice sheet margin at that time. Because this upland deposit is composed of permeable sand and gravel, the outwash plain is a main ground-water recharge area and the deposits comprise a principal aquifer of the area. The deposits closest to the land surface and the physiography, in general are the result of glacial advance and retreat during the last glacial period, the Wisconsin. www2.nature.nps.gov /geology/parks/slbe   (7642 words)

UCMP Glossary: Geology A ridge of glacial sediment deposited by a stream flowing in and under a melting glacier. The study of rock layers (e.g., distribution, environment of deposition, age) based on their fossils; biostratigraphic- adj. A fan-shaped deposit of sand, mud, etc. formed by a stream where its velocity has slowed, such as at the mouth of a ravine or at the foot of a mountain. www.ucmp.berkeley.edu /glossary/gloss2geol.html   (3545 words)

Encyclopedia: Coast Deposition, also known as sedimentation, is the geological process whereby material is added to a landform. Tombolo at Stockton Island, Ashland County, WI A tombolo in Puget Sound A tombolo is a deposition landform such as a spit or bar which forms an isthmus between an island or offshore rock and a mainland shore, or between two islands or offshore rocks. Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. www.nationmaster.com /encyclopedia/Coast   (3688 words)

Sediments and Sedimentary Rocks Sediment is transported from the place of weathering to the place of deposition. Sediment can be deposited in different places at the same time, yet look very different because of a different depositional environment. Detrital sediments are also characterized by their sorting, the degree to which clastic particle sizes are similar. www.geo.ua.edu /intro03/Seds.html   (3688 words)

Nat' Academies Press, Material Fluxes on the Surface of the Earth (1994) The term survival rate is somewhat deceptive because it is not an expression of the rate of survival of the sediment, which would more properly be a measure of the amount of sediment remaining relative to the amount originally deposited divided by the time elapsed since deposition. Glacial Sediments on Land To estimate the masses of glacial sediments on land (moraines, ground moraine, and associated glaciofluvial and glaciolacustrine deposits), I measured the areas of the peripheral parts of the glaciated regions, where the glacial sediments accumulated, shown on the Quaternary geologic maps of the continents in Gerasimov (1964). The average thickness of Quaternary sediment in 28 DSDP and ODP holes drilled in the Mediterranean is 182 m (Cita et al., 1978; Kastens et al., 1987), and the estimated solidity is 52 percent; the long-term apparent accumulation rate is 15.67 g/cm2/kyr. www.nap.edu /books/0309047455/html/15.html   (3688 words)

Sedimentary Rocks Sediments [ sedimentum La. settling] are produced by the surficial processes of weathering, transportation and deposition [all discussed in more detail later]. sediment reflects its source rock - cobbles, sand-sized grains and smaller ones are often rock fragments, or mixes of quartz with less stable materials such as feldspars and ferromags. Normally this would end up with quartz sands and clay mud deposits for detrital materials, and various chemical sediments such as lime muds. www.pitt.edu /~harbert/courses/GEO0040/2G_SEDRX.html   (3688 words)

Sedimentary Rocks The erosion, transportation and deposition of material by moving water is an energy-controlled process that results in deposits of sediment that are typically well sorted in terms of the size of fragments. Sediment can be defined as any material that settles to the bottom of a fluid. Chemical sediments form from the precipitation of minerals from water when the solution becomes saturated or supersaturated in that particular mineral. darkwing.uoregon.edu /~jrice/geol_311/Seds.html   (3688 words)

Glossary of Terms: D Sedimentary rock that is composed of particles transported to their place of deposition by erosional processes. Large deposit of alluvial sediment located at the mouth of a stream where it enters a body of standing water. Is a landform formed from the deposition of weathered and eroded surface materials. www.geog.ouc.bc.ca /physgeog/physgeoglos/d.html   (1679 words)

Historical Geology The deposition of these alternating sediment layers continued as several thousand feet of strata were deposited. The loose and unconsolidated sediments deposited during the different glacial invasions and interglacial intervals were left in such a position that in some cases they were exposed to the action of the waves. During the latter part of the Triassic period the area was down-warped, and the seawaters came in and deposited the sediments of the Haro formation. nwic-research.org /npsec/html/ecodesc/geomorph/geology/histgeo.htm   (1406 words)

Untitled Document Generally composed of sediment that is genetically related in deposition and form a coherent, and lithologically distinct from the rock above or below it. Sedimentary rocks are deposited at Earth's surface and the way in which they accumulate, their texture, composition, structure and fossil content can be used to determine a sedimentary rock's depositional environment. Indicates that the sediment accumulated under the influence of unidirectional currents of water or wind. www.ualr.edu /~ersc/physical/LSedRx.html   (1406 words)

Huddersfield Geology Group Local Geology Environments of Deposition Westphalian strata are geologically significant in that their sediments follow a cyclic pattern of deposition repeated many times. The coarsest sediments were deposited in the channels of the fastest flowing rivers while finer sediments, after prolonged sorting, settled on the river banks and the delta front. One scenario put forward by geologists is that the area south of the northern landmass was a basin which was slowly subsiding due to the overlying weight and compaction of the new sediment being laid down. www.huddersfieldgeology.supanet.com /pages/p20envi.htm   (721 words)

Publications from Aberystwyth Luminescence Research Laboratory Orford, J.D., Murdy, J.M. and Wintle, A. (2003) Prograded Holocene beach ridges with superimposed dunes in north-east Ireland: mechanisms and timescales of fine and coarse beach sediment decoupling and deposition. Bailey, S.D., Wintle, A.G., Duller, G.A.T. and Bristow, C.S. (2001) Sand deposition during the last millennium at Aberffraw, Anglesey, North Wales as determined by OSL dating of quartz. Clarke,ML, (1996) IRSL dating of sands:bleaching characteristics at deposition inferred from the use of single aliquots. www.aber.ac.uk /~qecwww/luminescence/publ.htm   (3382 words)

Readings Describe the environments of deposition and factors governing the formation of both inorganic (limestone, evaporites, dolostone, and chert) and organic (limestone, chert, and coal) chemical sedimentary rocks. Differentiate among the characteristics and processes of formation of the detrital sedimentary rocks (shales, sandstones, conglomerates, and breccias). Explain the difference between detrital sediment and chemical sediment. cliodhna.cop.uop.edu /~lkfox/GEOL83/Readings.html   (3382 words)

ABSTRACT: Braided stream aggradation on an alluvial fan margin: Emerald Lake fan, British Columbia. At the fan margin, bed slope is 0.024, sediment is predominantly coarse gravel, flow is shallow and fluctuating, and sediment transport and deposition are dominated by chutes and lobes. Since chutes and lobes dominate sediment transport and deposition in streams at the distal margin of this rapidly aggrading fan, it is likely that similar deposits should be present in many ancient alluvial fan sequences, but as yet have gone largely unrecognized. Flow unconfinement at the exit of rapidly formed shallow scour channels typically results in deposition of sediment lobes 0.2 m thick and 10-250 m2 in area. cgrg.geog.uvic.ca /abstracts/GoedhartBraidedEvolving1998.html   (301 words)

Title page for ETD etd-0404103-084700 Magnitude and variations of sediment deposition at 14 sites were compared during an 18-month study in the upper 415 km2 of Breton Sound estuary, Louisiana. The project objectives were to quantify short-term sediment accumulation using sediment traps, evaluate sediment trap effectiveness, and compare long-term deposition using feldspar horizon markers and 210Pb dating to the annual sediment trap deposition. Louisiana¡¯s deltaic coast is a dynamic sedimentary environment made vulnerable by Mississippi River channelization, which restricts freshwater, sediment, and nutrient inputs to adjacent estuaries. etd.lsu.edu /docs/available/etd-0404103-084700   (301 words)

Sedimentation and Bathymetric Change in San Pablo Bay: 1856–1983 A long-term perspective of erosion and deposition in San Francisco Bay is vital to understanding and managing wetland change, harbor and channel siltation, and other sediment-related phenomena such as particle and particle-associated substance (pollutants, trace metals, etc.) transport and deposition. In contrast, from 1951 to 1983 much of the Bay changed from being depositional to erosional as sediment supply diminished and currents and waves continued to remove sediment from the Bay. Change in sedimentation must also have affected flow in the Bay, areas where polluted sediments were deposited, exchange of sediment between the nearshore and wetlands, and wave energy reaching the shoreline that was available to erode wetlands. geopubs.wr.usgs.gov /open-file/of98-759   (421 words)

USGS Scientific Investigations Report 2005-5064 Graphs showing trends in total polychlorinated biphenyl (PCB) concentrations (sum of PCB congeners) in sediment cores relative to (a) sediment depth and (b) date of sediment deposition, Woods Inlet, Lake Worth, Fort Worth, Texas, 2003 Graphs showing selected polychlorinated biphenyl (PCB) congener assemblages normalized (divided) by total PCB (sum of PCB congeners) for surficial bottom sediment in areas of Woods inlet and suspended and streambed sediment in tributary streams to Woods Inlet, Lake Worth, Texas, 2003 Woods Inlet is a flooded stream channel on the southern shore of Lake Worth along the western boundary of Air Force Plant 4 in Fort Worth, Texas, where elevated polychlorinated biphenyl (PCB) concentrations in sediment were detected in a previous study. pubs.usgs.gov /sir/2005/5064   (1110 words)

Try your search on: Qwika (all wikis)

About us   |   Why use us?   |   Reviews   |   Press   |   Contact us   Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.