Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"rock uplift"”.
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Uplift history and geomorphic development of the Southern Alps, New Zealand, assessed by fission track analysis
The uplift history and geomorphic development of the Southern Alps has been studied, using fission track analysis of basement samples in combination with measurement of the present geomorphology of the Southern Alps. During the late Cenozoic the Pacific plate has been converging obliquely with the …
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Structural, thermal, and geomorphic evolution of the eastern margin of the Tibetan Plateau
… of the rates and pattern of Pleistocene-Recent rock uplift; 3) an assessment of the controls on the spatial distribution of bedrock channel gradients in this landscape. Thermal histories of rocks along the margin inferred from *Ar/39Ar and (U-Th)/He thermochronology provide constraints on the …
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Interpretation of tectonics from digital elevation data in the San Gabriel Mountains, CA : evaluation of methods and data sources
… Gabriel Mountains were used to estimate relative rock uplift rates. The results suggest that the eastern region of the San Gabriel Mountain is controlled by a high rock uplift rate while the western region is controlled by a low rock uplift rate. Furthermore, arrangement of the variations of the …
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Tectonic-Climate Interactions And Glacial History Within The Chugach And Kenai Mountains, Alaska
… fundamentally controlled by the combination of rock uplift and distribution of precipitation. This relationship 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 …
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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
… 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 Last Glacial …
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Dynamic topography of the western Great Plains : geomorphic and 40Ar/39Ar evidence for mantle-driven uplift associated with the Jemez lineament, New Mexico and SE Colorado
… geomorphic parameters and tectonic rock uplift as drivers of long-term erosion. This study distinguishes between these drivers on the plains of New Mexico and Colorado where post-Miocene erosion and late Cenozoic volcanism of the Jemez lineament have produced distinctive modern …
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Geomorphic and thermochronologic signatures of active tectonics in the central Nepalese Himalaya
… with previously mapped faults. Rates of rock uplift, erosion, and exhumation for rocks surrounding this physiographic transition are investigated using digital topographic data, ⁴⁰Ar/³⁹Ar thermochronology, cosmogenic radionuclides, and thermal modeling, to determine whether this break in …
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Lithologic Controls on Bedrock Channel Morphology in the Buffalo River Basin
… models assume an equilibrium state between rock uplift rates and erosion rates. However, analysis of chi gradients of bedrock channels across several lithologies in the Buffalo River Basin reveals disequilibrium in the basin controlled by the presence of a thick interval of Pennsylvanian …
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Intermontane valley fills
… allows reconstructing fill thickness and bedrock topography on the scale of catchments to entire mountain belts. Second, I used the new method for estimating the spatial distribution of post-glacial sediments that are stored in the entire European Alps. A comparison with data from exploratory …
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Tectonic and climatic controls on orogenic processes : the Northwest Himalaya, India
… the opportunity to determine the history of rock-uplift and exhumation paths along an approximately 120-km-wide NE-SW transect spanning the greater Sutlej region of the northwest Himalaya, India. 40Ar/39Ar data indicate, consistent with earlier studies that first the High Himalayan …
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New incision rates on the Colorado River system based on cosmogenic burial dating of terraces : implications for a transient knickpoint at Lees Ferry and differential uplift of the Rocky Mountains
… system of the western slope of the Colorado Rockies and Colorado Plateau. Comparison of river profiles and rates of incision between these rivers provides a natural laboratory for resolving controls on river evolution. Disequilibrium profiles in both rivers are evident by numerous knickpoints …
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Bedrock channel response to tetonic, climatic and eustatic forcings
The response of bedrock channels to external forcings is investigated in this thesis. The approach is to test and constrain a theoretical model for bedrock-channel incision based on shear stress using field data. The primary study area is a series of 21 small, coastal drainage basins in northern …
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The Effect of Structure and Lithology on Aspect Ratio of Fluvial Channels: A Field-Based Quantitative Study of the New River in Three Geologic Provinces
… variables. The width of mixed alluvial-bedrock channels generally is a function of discharge, with variations due to local conditions. The aspect ratio (width/depth) of channels is heavily influenced by substrate size and erodibility. How channel width and aspect ratio vary as a function of …
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Collisional Reactivation of Rift Margin Fracture Zones, Taiwan and the Taconic Allochthon
… normal to the topographic break. In addition, rock uplift rates were examined by extracting normalized steepness indices from streams with catchments ≥ 10 km<sup>2 </sup>within the Tachia, Peikang, and Mei River basins. With the incorporation of precise leveling data, zones of equal steepness …
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Continental Deformation: Collisional Orogenesis to Passive Margin Processes
… Nepal river channel steepness (ksn), a proxy for rock uplift rate over 103-105 years, coupled with a seismotectonic model, and then expand this map and accompanying model to the entire Himalaya; and a subsidence analysis of the northern abyssal Gulf of Mexico (GoM), which I use to evaluate …
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Effects of differential rainfall on the dynamics of landscape evolution
… Generally, these elevations change due rock uplift as well as incision. Rivers are the major driving force for incision in the landscape, and the amount that a river incises is greatly dependent on the amount of discharge flowing through it. Discharge is dependent on the structure of the …
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Hillslope erosion and weathering rates in Earth's most rapidly uplifting mountains
… power-law volume-area scaling exponents than bedrock landslides, which has significant implications for accurately quantifying landslide erosion rates. By applying the landslide volume-area scaling relationship to over 15,000 landslides in the Tsangpo Gorge region of the eastern Himalaya, I …
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Post-Orogenic Exhumation and Glacial Erosion on the Flanks of the North Atlantic
… the landscape may be limited by low tectonic rock uplift rates or as a result of erosionally inefficient cold based continental ice-sheets. In this dissertation the evolution of post-orogenic topography and the effect of glaciations on denuding landscapes along the North Atlantic Passive …
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Overcoming unrealistic behavior of landscape evolution models attributed to the stream power incision model: Scale invariance and ultra-sensitivity to initial conditions
… behavior of the most-commonly used bedrock incision model used in LEMs; Chapter 3 compares the sensitivity of numerical LEMs and physical experiments to their initial conditions; and Chapter 4 explores a recently published sub-model that can remedy unrealistic behavior in current LEMs. …
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Evaluating the Controls of Neogene Exhumation in the Tropical Northern Andes (colombia)
… of millions of years—the rate at which rocks located at great depths within the Earth cool as they are transported to the surface through the erosion of overlying rock from the surface. The results show that the rates and timing of exhumation are spatially variable along the Eastern …
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