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.
Results
Showing 1 to 11 of 11 for “"incision rates"”.
-
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
… 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 and convexities. By compiling existing age constraints and …
-
Quaternary incision history of the Black Canyon of the Gunnison, Colorado
… Black Canyon. In the last 640ka, average bedrock incision rates surrounding the knickpoint are unbalanced and vary from 130-150 m/Ma (downstream) to 470-600+ m/Ma (within) to 90-95 m/Ma (upstream), necessitating knickpoint migration. The 640ka profile, reconstructed from terraces containing Lava …
-
Neotectonic evolution of Grand Canyon : interaction between volcanism, river incision, epeirogenic uplift, and faulting
… focuses on the effects of volcanism, river incision, epeirogenic uplift, 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 …
-
Deep-seated bedrock landsliding in Grand Canyon's Surprise Valley area
… age dating. Detachment height, long-term bedrock incision rates, and structural relationships suggest major failures events occurred at 3 Ma, 1 Ma, <<1 Ma. Paleotopography, groundwater, and bedrock incision likely drove landsliding rather than lava-dammed lakes downstream based on geochronology.
-
Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape
… goals of this work are: 1) to characterize the rates and processes of river incision and erosion associated with major rivers dissecting the eastern margin; 2) to better understand and constrain the transient landscape evolution that defines regional topography; and 3) to move closer to …
-
Uranium-series geochronology and stable isotope analysis of travertine from Soda Dam, New Mexico : a Quaternary record of episodic spring discharge and rivern incision in the Jemez Mountains hydrothermal system
… and geologic context with respect to incision rates of the Jemez River and the episodic nature of travertine deposition. The largest volume deposit (deposit A), high in the landscape on the west side of the river, yields stratigraphic ages ranging from >500 ka (outside of U-series …
-
Fluvial Response to Intra-Canyon Lava Flows, Owyhee River, Southeastern Oregon
… dating of lava flows, estimates of mean incision rates through and the around the West Crater flow range from 0.27 mm/yr at Airplane Point to 3.3 mm/yr at Dog Leg Bar. No deposits from catastrophic outburst floods resulting from lava dam failure have been found, supporting gradual …
-
Elevation, Longitudinal Profile, And Schmidt Hammer Analysis Of Strath Terraces Through Capitol Reef National Park, Utah: Bedrock Channel Response To Climate Forcing?
… that in this area of the Colorado Plateau incision rates are on the order of ~60 to 85 cm/ka, which is on the high end of reported rates from other researchers.</p>
-
EPISODIC UPLIFT OF THE ROCKY MOUNTAINS: EVIDENCE FROM U-PB DETRITAL ZIRCON GEOCHRONOLOGY AND LOW-TEMPERATURE THERMOCHRONOLOGY WITH A CHAPTER ON USING MOBILE TECHNOLOGY FOR GEOSCIENCE EDUCATION
… the Rocky Mountains. These studies include incision studies (Chapter 1), detrital zircon analysis of Cenozoic fluvial deposits resting on the Rocky Mountain Erosion Surface (Chapter 2), and low temperature apatite fission track (AFT) and U-Th/He (AHe) low temperature thermochronology to look …
-
U-series dating, geochemistry, and geomorphic studies of travertines and springs of the Springerville area, east-central Arizona, and tectonic implications.
… structures, basalt geochronology, and river incision studies to formulate an integrative model for both travertine formation and for landscape evolution of this region. More than 70 individual travertine mounds and large platforms, formed from the coalesced deposits of multiple spring vents, …
-
Evaluating the Controls of Neogene Exhumation in the Tropical Northern Andes (colombia)
… tropics of South America. To obtain exhumation rates, I used thermochronology, which is a method that records—over timescales 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 …