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Showing 1 to 20 of 21 for “"glacial till"”.
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Pebbles in the glacial till of eastern North Dakota
… paper is a study of twenty-three samples of glacial in eastern North Dakota. The samples were analyzed in terms of lithology, shape, and roundness. Graphs are given showing the relationships among the various factors. The graph are discussed and significance of the various factors affecting …
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Multiple Till in North Dakota
… and laboratory studies have been completed on a glacial till exposure in the Inkster area. From the results obtained, it is the belief of the author that multiple till does occur in North Dakota.</p>
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Assessment Of Electrical Resistivity Method To Map Groundwater Seepage Zones In Heterogeneous Sediments At Mirror Lake, NH
… data sets show the transition from high-seepage glacial outwash to low-seepage glacial till, demonstrating reproducibility. However, even the finer 0.5-m electrode spacing was insufficient to resolve the heterogeneity well enough to predict seepage variability within each zone. In two sections …
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A preconcentration-spectographic method for the determination of trace elements in plant materials and the application of the biogeochemical method at the Silver Mine lead deposit Cape Breton, Nova Scotia
… drilling, is covered by approximately 50 feet of glacial till. The Ag, Be, Co, Cr, Mo, Ni, Pb and Zn contents of mineral soil (B1), organic soil (A1) (humus), lower bark, upper bark, twigs and needles of balsam fir and black spruce, were determined.Lead anomalies were found in all materials, which …
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Surface geology for land use planning, Minot, North Dakota area
… of the Bullion Creek Formation, Pleistocene glacial till, ice contact fluvial deposits, and other fluvial deposits of the Coleharbor Group, and Holocene fluvial and eolian deposits of the Oahe Formation.</p> <p>Expansion of the Minot metropolitan area has resulted in conflict between urban …
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Azimuthal resistivity to characterize fractures in the Battleford formation, Birsay, Saskatchewan
… the orientation and extent of fracturing in a glacial till. The target consisted of shallow (less than 4m deep) fractures in the upper oxidized portion of the Battleford Formation. The fractures were visible in soil cores, but their orientation and extent were not known at the time of …
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Surficial geology of the southern half of Griggs County, North Dakota
… for the present appearance of the surface. The tills deposited during glacial stillstands cannot yet be differentiated by texture or X-ray diffreaction analyses, but the average shale pebble content of Kensel till is 16% higher than Cooperstown till.</p> <p>Synthesis of Pleistocene history is …
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Landscape history and contemporary environmental drivers of microbial community structure and function
… contribution to ecosystem processes across a glacial till sequence in Taylor Valley, Antarctica. Within each till unit, I sampled from dry areas and areas with visible evidence of recent surface water movement generated by seasonal melting of ephemeral snow packs and hillslope ground ice. …
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Groundwater/surface water interaction in the Raisin River watershed, near Cornwall, Ontario.
… underlies various surficial deposits (primarily glacial till). Groundwater movement appears to be in a southeasterly direction, towards the St. Lawrence River. Seepage meters, mini-piezometers, and a falling head permeameter were used to (i) measure the flux of groundwater into (positive seepage) …
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The Dynamics of the Late Neogene Antarctic Ice Sheets in the Central Ross Sea using a Multianalytical Approach
… Sea since the late Miocene, the provenance of glacial till from IODP expedition 374 site U1522 was assessed using a suite of three analyses. A total of 3,869 zircons, between 250-63 microns in size, from sixteen different cores were measured for U-Pb isotopes via LA-ICP-MS. Zircon data was …
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Provenance of the ice-cored moraine at Mt. Achernar, Law Glacier, Antarctica
Glacial till from the Mt. Achernar moraine (MAM) records pre- and post- last glacial maximum (LGM) compositional variability of an East Antarctic moraine sequence through time and space. Pebble lithology, detrital zircon geochronology, and till geochemistry were analyzed on samples from a 6.5 km …
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Reconstructing the depositional history of the Eel River paleo meltwater channel, northeastern Indiana using sediment provenance techniques
… helps clarify the ice dynamics and Last Glacial Maximum sediment depostional history in northeastern Indiana, which is complicated because of the interactions between the Erie and Saginaw Lobes. Outwash deposits were analyzed from IGS core SC0802 in the Eel River paleo meltwater channel, …
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Coupled thermo-hydro-mechanical behavior of glacial tills in shallow geothermal systems
… the coupled thermo-hydro-mechanical behavior of glacial tills in central Illinois and suggest a constitutive model for describing their short- and long-term behavior. Four specimens of predominantly fine-grained glacial till were collected in the upper 20 m from a 110-meter deep test borehole …
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An Investigation of Ni and Cu Isotopic Fractionation in Basal Duluth Complex Cu-Ni-PGE Mineralization, Northeastern Minnesota
… locations in the basal Duluth Complex, including glacial till beds and surface outcrops in the vicinity of the I, II, Serpentine, Mesaba, and NorthMet deposits. Additional drill core material was obtained from the III, Wetlegs, and Wyman Creek deposits. A detailed characterization of till, …
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Land-use change effects on soil organic carbon, total soil nitrogen, and soil erosion in a temperate forest and grassland
… cropland on a Mollisol derived from loess over glacial till in Western Iowa. Tree ring data suggest that the forested site has been intact for about 70 years, although part of the site was used for grazing for a period. A monument marker at the prairie site suggests the location has not been …
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The geochemical evolution of saline groundwater within a fresh water aquifer south of Oakes, North Dakota
… The trough is within the northern part of the Glacial Lake Dakota plain. Sediments in the lake plain, which is an unconfined aquifer, are sands that grade downward to gravels. Within the trough sands are overlain by Holocene lacustrine silts and clays. A discontinuous unit of lacustrine silt …
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The Relationships Between the Volumetric Deformation Moduli of Unsaturated Soils
… suction planes. Two soils, a uniform silt and a glacial till were tested. Specimens were formed by static compaction at half standard Proctor compaction effort with either dry of optimum or at optimum initial water contents. The investigation included specimens being loaded and unloaded under Ko …
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Temporal Dynamics of Groundwater Flow Direction in a Glaciated, Headwater Catchment
… wells, screened from 2.4 - 6.9 m depth within glacial sediments of the C horizon. I conducted 47 slug tests across the well network to determine hydraulic properties of the aquifer materials surrounding each well. In addition, our team conducted a large-scale auger investigation mapping soil …
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A Multi-scale Analysis of the Potential Impacts of Rapid Climate Change on Forest Lands Managed by the Department of Defense in the US
… and convex landforms covered in coarse-textured glacial till. However, boreal and cool temperate species, such as sugar maple (Acer saccharum), yellow birch (Betula alleghaniensis), aspens (Populus tremuloides, P. grandidentata) and eastern hemlock (Tsuga canadensis) that are major current …
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Climatic Controls on the Porewater Chemistry of Mid-continental Wetlands
… wetland systems, located only 350 km apart: the Glacial Lake Agassiz Peatlands (GLAP) of northern Minnesota and the Cottonwood Lake Study Area (CLSA) of North Dakota. The former study site consists of a large (7,600 km2), circumboreal peatland that developed an extensive blanket of peat over the …
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