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Showing 1 to 18 of 18 for “"glacial erosion"”.
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Post-Orogenic Exhumation and Glacial Erosion on the Flanks of the North Atlantic
… often associated with enhanced rates of erosion, is one such possible cause of passive margin rejuvenation. However, along passive margins the effectiveness of Plio-Pleistocene glaciers at eroding the landscape may be limited by low tectonic rock uplift rates or as a result of erosionally …
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The Impact of Long-Term Glacial Erosion on the Active Chugach-St. Elias Mountains, southern Alaska
The influence of erosion on uplifting orogens has been demonstrated to be a primary force in landscape development. An understanding of fluvial erosion in mountain belts is fairly well documented, but the impact of glacial erosion is yet to be fully recognized. The uplift of the Chugach-St. Elias …
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Constraining tectonic and climatic controls on glacial/postglacial landscape evolution using numerical modeling
… belts and stable continental interiors. The glacial/interglacial climate perturbations have caused repeated transitions between glacial and fluvial processes. During cold glacial periods, erosion and deposition by ice sheets and glaciers has left a clear imprint on Earth’s surface, creating …
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The interaction of climate, tectonics, and topography in the Olympic Mountains of Washington State: the influence of erosion on tectonic steady-state and the synthesis of the alpine glacial history
… the influence of glaciers on spatially variable erosion and rock uplift rates. As glaciers have long been present on the peninsula, could glacial erosion explain the observed pattern of rock uplift? A numerical model of glacial flow, ICE Cascade, is used to reconstruct the glacial extent of the …
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Climatic variation, solute concentration and solute flux in meltwaters draining from an alpine glacier
… of finely-divided sediment produced by glacial erosion results in high solute flux levels in rivers draining glacierised basins. As solute cc concentration varies inversely with discharge, variation with discharge of solute flux, the product of discharge and solute concentration, relates …
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Tectonic-Climate Interactions And Glacial History Within The Chugach And Kenai Mountains, Alaska
… attributes fluctuations in climate to the erosion of orogens, sedimentation rates, and geodynamics of the crust. Glaciers are the most effective climate driven erosive processes, where the frequency of glacial periods has a direct impact on the structure of mountain ranges through time. The …
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A Thermochronological Investigation of Orogenic Architecture, Kinematics, and Tectonic-Climatic Interactions within the St. Elias Orogen, Alaska
… research has focused on the long-term effects of glacial erosion on orogenesis. Low-temperature thermochronometry and subsidiary structural, earthquake relocation, and offshore seismic reflection data from the St. Elias orogen are the basis for a new architectural model and demonstrate an …
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Evolution of topography in glaciated mountain ranges
… The basic approach is to compare fluvial and glacial landscapes, since it is the change from the former to the latter that accompanies climatic cooling. This allows a detailed evaluation of hypotheses relating climate change to tectonic processes in glaciated mountain belts. Fieldwork was …
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Glacial geology of western Wells County, North Dakota
… Wells County were formed during late Wisconsinan glacial activity. Because of the relatively dry climate they have been modified only slightly by post-glacial erosion and mass wasting.</p> <p>The southern one-third of the area is characterized by randomly-oriented mounds of till or dead-ice …
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Influence of structural variability on glacially-eroded steps, Uinta Mountains, UT
… of the western Uinta Mountains exhibit stepped erosional profiles. These profiles consist of tall, steep, cliffs (~10m high) separated by low relief areas, which are often occupied by lakes. Directly opposite these valleys, on the northern slopes of the range, the profiles are quite different. …
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Spatial and temporal dynamics of biogeochemical processes in the Fraser River, Canada : a coupled organic-inorganic perspective
… storage capacity and non-steady-state post-glacial erosion state of the Fraser River. A large portion of the dissolved inorganic carbon load of the Fraser River (>80%) is estimated to derive from remineralization of dissolved organic carbon, particularly during the annual spring freshet when …
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Constraining the pathways and fluxes of subglacial meltwater beneath the palaeo-Antarctic Ice Sheet
… shelf imply that there was an active subglacial hydrological system beneath the palaeo Antarctic Ice Sheet. The dimensions of the channelised features is inconsistent with the minimal quantities of meltwater produced under the Antarctic Ice Sheet at present; consequently, their formative …
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Water flow beneath past ice sheets
… respond to climatic warming. However, the subglacial realm of ice sheets is one of the most inaccessible environments on Earth. Consequently, little is known about the processes that operate beneath today’s ice masses — and how these will evolve in the future. Subglacial landforms present in …
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Spatial and temporal dynamics of biogeochemical processes in the Fraser River, Canada : a coupled organic-inorganic perspective
… storage capacity and non-steady-state post-glacial erosion state of the Fraser River. A large portion of the dissolved inorganic carbon load of the Fraser River (>80%) is estimated to derive from remineralization of dissolved organic carbon, particularly during the annual spring freshet when …
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A Second North American Hot-spot: Pleistocene Volcanism in the Anahim Volcanic Belt, west-central British Columbia
… volume and most have been heavily modified by glacial erosion. These centers are compositionally heterogeneous but overall the lavas erupted in either field are similar to those erupted from the larger Itcha Range shield volcano nearby. Rock types include minor alkali basalts and basanites …
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Neotectonics & Cooling History of the Southern Patagonian Andes
… ways, considering either purely climatic (i.e. glacial erosion) or geodynamic (slab-window related) controlling factors. This thesis focuses on two main aspects of these controversial topics. First, based on field observations and bedrock low-temperature thermochronology data, the thesis …
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Late Cenozoic Exhumation in a Transpressional Setting: Fairweather Range, Alaska
Deformation in southern Alaska is controlled by the accretion and partial subduction of the Yakutat terrane as margin-parallel motion transitions to subduction. Recent studies have shown that deformation in the St. Elias orogen, at the northern end of the terrane, accommodates a large portion of …
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Landscape evolution and preservation of ice over one million years old quantified with cosmogenic nuclides 26Al, 10Be, and 21Ne, Ong Valley, Antarctica
… in the ice sheet itself, deep sea sediments, and glacial deposits on the continent (Ingólfsson, 2004). Quaternary continental records of AIS extent is limited to few locations along the Transantarctic Mountains (TAM) and coastal continental boundaries (Denton et al., 1984; Denton et al., 1989). …