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 19 of 19 for “"Low Temperature Thermochronology"”.
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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
… Rocky Mountain Erosion Surface (Chapter 2), and low temperature apatite fission track (AFT) and U-Th/He (AHe) low temperature thermochronology to look at differential cooling histories across the Rockies (Chapter 3). Chapter 4 investigates a project in which I designed and deployed a mobile …
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Post-Orogenic Thermal History and Exhumation of the Northern Appalachian Basin: Low-Temperature Thermochronologic Constraints
… rates within the upper continental crust. Low-temperature thermochronology, notably apatite fission-track thermochronology because it has a kinetic parameter (i.e. track lengths), is commonly used to constrain the tectonic history of orogenic belts and the thermal history within sedimentary …
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Argon and Neon Diffusion in Lunar Impact Glass & The Development of the Electron Microprobe Zircon Fission-Track Dating Technique
… is subdivided into three independent chapters on low temperature thermochronology. In chapter one a new methodology is presented for dating zircon using the fission-track technique. Chapters two and three describe experiments and modeling to determine the diffusion kinetics of Ar and Ne in lunar …
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Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape
… topographic data, cosmogenic isotope data, low-temperature thermochronology and numerical simulations to better understand the evolution of these rivers and tectonics of the region. The goals of this work are: 1) to characterize the rates and processes of river incision and erosion …
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Behavior of Hybrid Thick- and Thin-Skinned Orogenic Wedges in the Western Interior USA and South-Central Andes
… cross section construction, structural analysis, low-temperature thermochronology, thermal history modeling, and regional space-time tectono-magmatic syntheses. Appendix A provides the first low-temperature thermochronologic data from the Little Belt Mountains of west-central Montana, showing that …
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Geologic mapping and zircon (U-Th)/He thermochronology of the Avawatz Mountains, California; Implications for the eastern terminus of the Garlock fault
… geologic mapping, structural analysis, and low-temperature thermochronology data to test these proposed structural and evolutionary models and to resolve the timing and kinematics of deformation. Field observations show numerous subvertical west-striking strike-slip faults in the western …
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Cenozoic exhumation history of the northern Richardson Mountains: Results from apatite and zircon (U-Th-Sm)/He analysis
New low-temperature thermochronology data from clastic sedimentary rocks in the northern Richardson Mountains, Canada, indicate significant exhumational cooling during late Eocene–early Oligocene time. Apatite (U-Th-Sm)/He (AHe) data were collected from 19 Proterozoic–Paleocene rocks across a 115 …
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Regional Deformation and Dynamic Processes of the Southern Puna Plateau, Central Andes
… (2) test Earth’s upper-crustal responses to lower lithospheric processes, and (3) explore uses of low-temperature thermochronology in studying landscape evolution. This thesis provides important constraints on regional deformation and landscape evolution for the southern Puna Plateau since …
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Surface uplift, fluvial incision, and geodynamics of plateau evolution, from the western margin of the Central Andean plateau
… In this thesis, a combination of bedrock low-temperature thermochronology (apatite and zircon (UTh)/He techniques), 40Ar/39Ar dating of valley-filling volcanic flows, and three-dimensional thermal modeling using a modified version of Pecube were applied to investigate the incision history …
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Tectonic Exhumation and Climate Driven Erosion in Extensional Mountain Blocks: Two Examples from California, USA
… zone, exposures of sedimentary basin fill allow inversion of erosion- and sediment-flux rates from a linked catchment-fan system within an extensional block. In this dissertation, I present two field and geo-thermochronology based studies that explore research topics related by common …
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Neotectonics & Cooling History of the Southern Patagonian Andes
… topics is the interpretation of the regional low-temperature thermochronology exhumational record and its relationship with tectonic and/or climate-driven processes, ultimately manifested and recorded in the landscape evolution of the Patagonian Andes. The prominent along-strike variance in …
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Timing of erosional episodes in the Marble Canyon and Vermilion Cliffs region from apatite (U-Th)/He thermochronology
… examined using a synthesis of new and published low-temperature thermochronology datasets. I test models for a 50-70 Ma Marble Canyon and interpretations that postulate SW to NE progressive denudational stripping of the Colorado Plateau via cliff retreat. The main goal is to evaluate the timing …
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The post-breakup evolution of the western Indian high-elevation passive margin
… passive continental margin. However, published low temperature thermochronometry suggests downwearing or parallel escarpment retreat as alternative models of margin evolution. Here are present the results of a sediment mass balance study utilising new data for the offshore portion of the Western …
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THERMOTECTONIC EVOLUTION OF THE ALASKA RANGE: LOW-TEMPERATURE THERMOCHRONOLOGIC CONSTRAINTS
… the central and eastern segments through low-temperature thermochronologic study of basement rocks; and 2) thermochronologic study of sediments of the Nenana Gravel and Usibelli Group in adjacent basins where deposition is related to the erosional unroofing of the Alaska Range. </p> …
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Post-Orogenic Exhumation and Glacial Erosion on the Flanks of the North Atlantic
… at eroding 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 …
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Insight from thermochronology, magnetotellurics, and structural analysis into the tectonic evolution of the Ozark Dome-Illinois Basin region, Midcontinent USA
… 550 m. This unconformity occurs as much 7.5 km lower in the adjacent Illinois Basin. Several first-order geological questions about the Ozark Dome and Illinois Basin, and the boundary between them, have not yet been definitively answered, including: When and how did the Great Unconformity form …
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Quantifying crystalline exhumation in the Himalaya
… the Kaghan Valley in Pakistan (NW Himalaya). Following closure of the Tethyan Ocean by ca. 55-50 Ma, the northward subduction of the leading edge of India beneath the Eurasian Plate and subsequent collision initiated a long-lived process of intracrustal thrusting that continues today. The …
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Cenozoic foreland-basin evolution in the northern Andes : insights from thermochronology and basin analysis in the Eastern Cordillera, Colombia
… sedimentological and biostratigraphic data with low-temperature thermochronology from the eastern sector of the Colombian Andes, in order to provide the first comprehensive account of mountain building and related foreland basin sedimentation in this part of the orogen, and to assess as to what …
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Tectonic and climatic control on the evolution of the Himalayan mountain front
… the intermontane valleys or ‘dun’s within the lower-elevation foothills of the range. Improved understanding of the spatiotemporal evolution of these sediment archives could provide a unique opportunity to decipher the triggers of variations in sediment production, delivery and storage in an …