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Full-Text Articles in Physical Sciences and Mathematics
The Dynamic Relationship Between The Bear River, Quaternary Basaltic Center, Normal Faults, And The Resulting Rearrangement Of Rivers In The Northeast Edge Of The Great Basin, Southeast Idaho, Brady Utley
All Graduate Plan B and other Reports, Spring 1920 to Spring 2023
The objective of this research project in Gem Valley graben, southeast Idaho is to identify the location, age and history of the Quaternary diversion of the Bear River into paleo-Lake Thatcher, and then into the Lake Bonneville basin from the Columbia River basin. Mapping, geochemical analysis, cross-cutting relationships, and five new age determinations, together with prior published research, shed new light on the complex history of interaction between the volcanic rocks, rivers, lakes, and faults in Gem Valley. Research goals were to test the hypothesis that local faulting and volcanism drove the diversion of the Bear River and controlled the …
Modeling Atmosphere-Mountain Interactions: Implications For Stable Isotope-Based Paleoaltimetry, Lauren B. Wheeler
Modeling Atmosphere-Mountain Interactions: Implications For Stable Isotope-Based Paleoaltimetry, Lauren B. Wheeler
Earth and Planetary Sciences ETDs
The measure of surface uplift can provide an important constraint on the behavior of continental lithosphere and the underlying upper mantle. Isotope-based paleoaltimetry aims to quantitatively estimate the magnitude and timing of surface uplift from records of the isotopic composition of precipitation in order to provide constraints on the tectonic processes driving mountain building. As the surface of a topographic barrier increases in height, along the windward side, δ-values of precipitation should get progressively more negative, and on the leeside, δ-values of precipitation should also get progressively more negative based on the presence and development of a topographically-induced rain shadow. …
Investigations On The Mesozoic Geologic And Tectonic History Of The Jackson Mountains, Northwest Nevada, Thomas Anthony Colby
Investigations On The Mesozoic Geologic And Tectonic History Of The Jackson Mountains, Northwest Nevada, Thomas Anthony Colby
Boise State University Theses and Dissertations
New geologic mapping, high-precision U-Pb zircon geochronology, and isotope geochemistry provide insight into the early Mesozoic paleogeography and magmatic, stratigraphic, and structural evolution of the Jackson Mountains in the Black Rock Desert region of northwest Nevada. The magmatic history of the Jackson Mountains records Late Triassic to Early Jurassic (~215-195 Ma) marine deposition of the Boulder Creek Beds adjacent to the arc followed by the Early Jurassic (~193-189 Ma) eruption and emplacement of the Happy Creek Igneous Complex and associated plutons of the Early Mesozoic Intrusive Suite. Pb, Sr, and Nd isotopic data from Early Jurassic intrusive rocks of the …
Late Cretaceous Extensional Collapse Of The Southern Cordillera: Evidence From The Bristol And Granite Mountains, Se California, Lee Hess
UNLV Theses, Dissertations, Professional Papers, and Capstones
Demonstrating the regional extent of Late Cretaceous extensional collapse of western North America’s southern Cordillera is important to understanding the tectonic evolution of the Sevier-Laramide orogens, and the geodynamics of ancient and modern orogens and synconvergent extension. Documenting Late Cretaceous extension in the southern Cordillera requires looking through the extensive overprint by Cenozoic structures. Late Cretaceous extension in the eastern Mojave region has been inferred from geochronology and thermochronology studies, which document Late Cretaceous cooling of Mesozoic granitoid rocks, some of which were emplaced in the middle crust. Cooling histories from these rocks have also been interpreted to be a …
Crustal Deformation During Arc-Flare Up Magmatism: Field And Microstructural Analysis Of A Mid-Crustal, Melt Enhanced Shear Zone, John Bennett Gilbert
Crustal Deformation During Arc-Flare Up Magmatism: Field And Microstructural Analysis Of A Mid-Crustal, Melt Enhanced Shear Zone, John Bennett Gilbert
Graduate College Dissertations and Theses
This study combines structural field data with microstructural observations in an analysis of a mid-crustal shear zone related to the emplacement of the Misty pluton during a high-flux magmatic event in Northern Fiordland, New Zealand. These high-flux magmatic events transport massive amounts of heat and material as they develop along accretionary continental margins, and represent a primary source of continental crust. Fiordland, New Zealand possesses, perhaps, the most extensive middle and lower crustal exposure of these systems on earth. Therefore, this study area provides a significant opportunity to understand processes of continental crust formation in the mid-crust and how these …
Re-Evaluating The Tectonic Model For The Arbuckle Mountains, Oklahoma By Spatial And Geometric Analysis Of Stratigraphic And Structural Trends, Dakota James Kolb
Re-Evaluating The Tectonic Model For The Arbuckle Mountains, Oklahoma By Spatial And Geometric Analysis Of Stratigraphic And Structural Trends, Dakota James Kolb
Electronic Theses and Dissertations
Understanding the spatial distribution and geometric relations between stratigraphy and structural features can allow for a more accurate tectonic timeline to be considered for not only the Arbuckle Mountains but for the assembly of modern North America. The Arbuckle Mountains in south central Oklahoma exhibit structurally complex stratigraphy associated with regional features like the Southern Oklahoma Aulacogen, the Arbuckle Anticline and the Washita Valley fault. Camp Classen YMCA and Turner Falls city park in Davis, OK, hosts observed, but largely unmapped, small scale structural features that best represent the magnitude of deformation. The goal of this study was to determine …
Karstic Depressions On Bolkar Mountain Plateau, Central Taurus (Turkey):Distribution Characteristics And Tectonic Effect On Orientation, Muhammed Zeynel Öztürk, Mesut Şi̇mşek, Mustafa Utlu, Mehmet Furkan Şener
Karstic Depressions On Bolkar Mountain Plateau, Central Taurus (Turkey):Distribution Characteristics And Tectonic Effect On Orientation, Muhammed Zeynel Öztürk, Mesut Şi̇mşek, Mustafa Utlu, Mehmet Furkan Şener
Turkish Journal of Earth Sciences
This study investigates the spatial distribution characteristics of karstic depressions that developed on a 2558 km2 plateau with gently sloping in neritic (reef) limestones in the western section of the Bolkar Mountains. The 30,132 karstic depressions identified are located at elevations between 1315 and 2525 m, while 31°/km2 slope and 5.6 km/km2 drainage density are limited to the spatial distribution of depressions. In the central section of the study area at the anticlinal surface, maximum density (99 depressions/km2) is reached between elevations of 1930 and 2080 m. The orientation of depressions is predominantly NE-SW. However, in the same area, the …
Pre-Mt. Simon Seismic Sequences Below West-Central Indiana: Local Interpretation And Regional Significance, Andrew Michael Parent
Pre-Mt. Simon Seismic Sequences Below West-Central Indiana: Local Interpretation And Regional Significance, Andrew Michael Parent
Browse all Theses and Dissertations
Constraining the composition, structure, and origin of basement provinces, deep assemblages of Precambrian rocks, is largely dependent on deep boreholes and geophysical techniques. This is especially true for the eastern U.S. midcontinent. Here, I employ regional 2-D seismic reflection, Bouguer gravity, and aeromagnetic data to interpret the upper crust below west-central Indiana. Seismic reflection data were donated to Wright State University in 2015. Geopotential data are available through the USGS and affiliates. These geophysical data, together, are analyzed in a regional geologic context. Three distinct seismic stratigraphic sequences are observed on 2-D sections. The first, uppermost sequence, typified by continuous, …