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Showing 1 to 20 of 37 for “"Grand Canyon"”.
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Stakeholder representation in park planning: localized place meanings at Grand Canyon
… representation in park [pre]planning at Grand Canyon National Park through an examination of place meanings from a lived experience perspective. Using a combination of photo-elicitation methods and semi-structured interviewing this research offers a novel form of representation among …
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Neotectonic evolution of Grand Canyon : interaction between volcanism, river incision, epeirogenic uplift, and faulting
… and faulting on the landscape evolution of the Grand Canyon region. In the first chapter the migration of increasingly asthenospheric basaltic volcanism is used to constrain lithospheric modification of the Colorado Plateau margins. Buoyancy modification of the upper mantle, driven by the …
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AN IMBRICATE MID CRUSTAL SUTURE ZONE: THE MOJAVE-YAVAPAI PROVINCE BOUNDARY IN GRAND CANYON, ARIZONA
… the oldest plutons and metasedimentary rocks in Grand Canyon. My results show that the Vishnu Schist does not support suturing. Paradoxically, plutons east and west of the Crystal shear zone support suturing based on different U-Pb-Hf isotopic characteristics across the shear zone. I interpret …
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Relative Timing of Porphyroblast Growth and Peak Metamorphism in the Lower Granite Gorge, Grand Canyon, Arizona.
The Gneiss Canyon shear zone in the Lower Granite Gorge of the Grand Canyon represents an important Paleoproterozoic tectonic boundary between the Mojave and Yavapai provinces, and records west-side-up shear and NW-SE contraction at elevated temperature (~600 degrees Celsius). Movement took place …
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Changing People, Consistent Experiences: 20 Years of Change and Stability at Grand Canyon National Park 1984-2004
… in the overnight backcountry hiker population at Grand Canyon National Park (GCNP) between 1984 and 2004. Longitudinal studies of visitor behavior in wildland recreation settings have been relatively rare but offer great potential for the improvement of management, clarification of conceptual …
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U-Pb geochronological constraints on the tectonic and thermal evolution of paleoproterozoic crust in the Grand Canyon, Arizona
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
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Archean detrital zircons in the Proterozoic Vishnu Schist of the Grand Canyon, Arizona : implications for crustal architecture and Nuna reconstructions
… 1.84 ± 1 Ga Elves Chasm orthogneiss of western Grand Canyon. This supports field evidence that Vishnu Schist was deposited on 1.84 Ga arc basement rather than in a juvenile 1.75 Ga arc setting. Archean grains of 3.8–2.5 Ga comprise 30% of all grains. A comparison of the > 2.2 Ga ages from the …
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Mesoproterozoic tectonic evolution of southwestern North America : protracted intracratonic deformation, sedimentation, and differential exhumation in Grand Canyon and the Rocky Mountain Region
The Unkar Group of the Grand Canyon Supergroup is one of the best preserved remnants of Mesoproterozoic sedimentary rocks in the southwestern United States. It provides an exceptional record of intracratonic basin formation and associated tectonics kinematically compatible with protracted …
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An assessment of the potential to use water chemistry parameters to define ground water flow pathways at Grand Canyon National Park, Arizona
… ground water flow pathways at the south rim of Grand Canyon National Park, Arizona. South rim spring, ground, and surface waters and one north rim spring were sampled from September 1992 through September 1993. Field measurements (pH, electrical conductivity, alkalinity, temperature, total …
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Microstructural, geochronologic and thermochronologic evidence for both Paleo- and Mesoproterozoic displacement across the Gneiss Canyon shear zone : lower Granite Gorge, Grand Canyon, Arizona
The Gneiss Canyon shear zone (GCSZ) in north-western Arizona sits between high grade migmatites on the west and lower amphibolite grade schists on the east. This 13 km-wide zone, contains domains of intense D2 strain up to 100m wide that separate blocks of preserved northwest-striking D1 fabric. …
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Identification, Mapping, Analysis, and Dating of Composite Mega Landslides in the Colorado Plateau
… focusing on landslide complexes within the Grand Canyon region of the Colorado Plateau. This is a vast and remote region of rugged topography. The landslide complexes in this study are greater than 10 million cubic meters in volume. The slides are located within different areas of the region …
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Syntectonic deposition and paleohydrology of the spring-fed Hualapai Limestone and implications for 5-6 MA integration of the Colorado River system through Grand Canyon : evidence from sedimentology, geochemistry and detrital zircon analysis
… available for 12 to 6 Ma at the mouth of the Grand Canyon. Because it directly underlies the first Colorado River gravels, this unit is a key element for understanding the integration of the Colorado River from the Colorado Plateau to the Basin and Range province, and the early paleogeography …
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Plant Community Invasibility in Riparian Landscapes: Role of Disturbance, Geomorphology, and Life History Traits
… invasion along the Colorado River through the Grand Canyon. Tree-ring analyses and surveys for <italic>Tamarix</italic> seedling establishment and adult density were used to understand the influences of hydrologic, climatic, and geomorphic factors on <italic>Tamarix</italic> establishment and …
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Day hiker preparedness: assessing the roles of past experience, safety messages & knowledge of safety practices
… preparedness behaviors of day hikers in the Grand Canyon National Park. In addition to that purpose, this study sought to integrate the theory of planned behavior and self-perception theory in order to better understand day hiker safety preparedness behaviors. Secondary data from a study on …
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The Geography of Daffodils
… Missouri and places significant to me, like the Grand Canyon and the Arizona desert, where I was raised. The second section is concerned with relationships from a woman’s perspective and the difficulty and breakdown in communications that precipitate the eventually end of an old – and beginning …
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Remote sensing for geomorphic and hydrodynamic modeling and process understanding
… dunefields along the Colorado River in the Grand Canyon in relation to geomorphic variables (Chapter 3), and lastly estimate river discharge from radar satellite measurements at river gage locations (Chapter 4). Chapter 2 of this dissertation determines how hydrodynamic model results (water …
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Deep-seated bedrock landsliding in Grand Canyon's Surprise Valley area
… the continental-scale Colorado River system in Grand Canyon remain poorly understood. This paper describes deep-seated bedrock landslides in the Surprise Valley area by combining detailed mapping, volume-balanced cross-sections, strath terrace heights, and cosmogenic burial dating of river …
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Rocks! (Are Hard To Care For)
… who is constructing a Rock Peace Garden, a ‘mini-Grand Canyon’, as a monument to her late husband. All four characters confront their personal inertia and isolation to ‘get a grip’ on their lives. A consistent challenge in the playwriting process has been structure and genre. The focus of the …
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The Urban Sublime: A Park Lodge for the National Mall
… by monumental natural elements such as the Grand Canyon, Niagara Falls, and Old Faithful geyser at Yellowstone. The National Park System was founded to provide public access to these natural wonders. The original parks all centered around Great Lodges that allowed visitors to not merely to …
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