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 37 for “"tectonic events"”.
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Crustal modification by tectonic events and upper mantle anisotropy beneath the Midcontinent Rift and New Madrid Seismic Zone: insights from receiver function studies and teleseismic shear wave splitting
… upper mantle have been continually modified by tectonic processes such as rifting, earthquake activity. In this dissertation, shear wave splitting and receiver function techniques were employed to study the extent of crustal and upper mantle modifications beneath the New Madrid Seismic Zone …
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Studies of Seismic Sources in Antarctica Using an Extensive Deployment of Broadband Seismographs
… and West Antarctica. I detect and locate seismic events using the traditional first arriving impulsive P and S waves as well as events classified as 'slow' earthquakes with no impulsive P-waves. I find evidence of tectonic events in East Antarctica (representing intraplate earthquakes within a …
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The tectonic relationships of the Hillabee Chlorite Schist and the adjacent rock units in southern Cleburne County, Alabama
… county Alabama contains two defined litho-tectonic blocks separated by a large displacement thrust fault. The Talladega block is composed of low grade metamorphic rocks. Sericite Phyllites and Quartzites are the main composition units. Metamorphic and tectonic events have created four …
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Cenozoic extension superimposed on a Mesozoic thrust belt, central Nevada
… distinct episodes that correspond to regional tectonic events; (2) record a rotation in the stress field through time; and (3) locally developed within a three dimensional strain field as opposed to plane strain; The Sand Spring, Ike Spring, and Indian Spring thrusts (previously undocumented) …
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Paleotectonic Investigation by Successive 3D Seismic Horizon Flattening in the Pennsylvanian Interval of Western Osage County, Oklahoma
… are utilized to evaluate possible intracratonic tectonic signals present in the subsurface stratigraphy of the Cherokee Platform as a result of the regional tectonic events of Pennsylvanian age. These events include: the Wichita, Ouachita, and Arbuckle orogenies, the Nemaha and Ozark Uplifts, and …
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The Skiddaw Group of Cumbria : early Ordovician Turbidite sedimentation and provenance on an evolving microcontinental margin.
… collision in the Silurian. Three major tectonic events have been postulated in the earlier history of the microcontinent rifting from Gondwana, onset of subduction and subduction of the mid-ocean ridge. Evidence for such events may be sought in the contemporaneous sedimentary basins: …
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Tectonic development of Proterozoic structures and their influence on Laramide and Miocene deformation, north Virgin Moutains, SE Nevada and NW Arizona
… and intrusive rocks that record four tectonic events from circa 1740 Ma to 1550 Ma (d1-D4) characterized by distinct structural fabrics and associated metamorphic assemblages and microstructures. The most prominent Proterozoic structure is the Virgin Mountains shear zone (VMSZ), which …
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Seismic anisotropy and mantle flow beneath Africa and Arabia
… popular hypotheses proposed for explaining these tectonic phenomena involve edge-driven small-scale mantle convection and the thermal or dynamic effects of one or more mantle plumes. In this study we use continental scale shear-wave splitting (SWS) measurements to provide additional constraints on …
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Geology of the Tierras Blancas Area in the Southeastern Acambay Graben, Central Mexico
… abundance of vertebrate burrows. Volcanic and tectonic events in the Acambay graben were the major controls on sedimentation during Pliocene-Pleistocene time. Various local volcanic structures produced source rocks for Pliocene-Pleistocene sediments, and intra-arc extensional tectonics caused …
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Structural analysis of brittle deformation features along Grenvillian shear zones in southeastern Ontario
… stress directions associated with major tectonic events suggest a history of repeated stages of deformation along the CMBbtz and RLmz. Neoproterozoic-Cambrian opening of the Iapetus Ocean is interpreted to have produced NNE-striking Proterozoic structural highs in Paleozoic cover above …
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Geologic and tectonic evolution of the Manzano Peak Quadrangle, central New Mexico
… belt, and document the style and timing of tectonic events. Major structures within the Precambrian core of the Manzano Peak Quadrangle include 1) the Monte Largo shear zone in the northwestern area of the quadrangle, 2) the Manzano Peak synclinorium; a regional fold interpreted as a second …
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Apparent weekly and daily earthquake periodicities in the western United States, and evolution of Wadi Kubbania in Egypt
… graben formatted as a result of regional tectonic effects of the rifting of the Red Sea and the associated uplift in form of graben structure prior to the flowing of the pre-Eonile River. analysis of seismic refraction data indicated that the Wadi Kubbania formed as a result of tectonic …
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Cenozoic evolution of the Pamir Salient; timing, mechanisms and paleo-environmental impacts : constraints from the Aertashi section, western Tarim Basin
… mountain ranges is one of the most significant tectonic events of the Cenozoic, with far reaching impacts on both regional and global climate. The Pamir represents the indented westward continuation of the northern margin of the Tibetan Plateau making them a key study area to examine internal …
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Crustal, Thermal, and Structural Controls on Hydrocarbon Systems in the Delaware Basin, West Texas, and Southeastern New Mexico
… expression of Mesoproterozoic – early Miocene tectonic events affecting hydrocarbon production in the Delaware Basin, the western physiographical province of the complexly structured, intracratonic Greater Permian Basin based on the interpretation of gravity and magnetic data, 3D seismic, and …
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Planetary Seismology using Single-Station and Small-Aperture Arrays: Implications for Mars and Ocean Worlds
… recover the Martian core within ±30 km if ≥ 3 events are located within an epicentral distance uncertainty of < ±1 degree. Increasing the number of detected events reduces core depth uncertainty, and higher signal-to-noise events will not affect core depth uncertainty or recovery rate. Next, I …
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An Integrated Geophysical Study of the Central Appalachians of Western Virginia and Eastern West Virginia
… different crustal regions with respect to the tectonic events affecting the Appalachians since the early Paleozoic. The combination of the results of new methods of seismic and potential fields processing with deep well and geologic information allowed the lateral continuity of two major …
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The thermal and metamorphic evolution of the Northern Highlands Terrane, Scotland
… deformation related to several orogenic events that occurred from Neoproterozoic to Devonian time. Deconvolving the signatures of multiple tectonic events and determining the rates of metamorphism in settings like the NHT are important parts of better understanding the thermal and …
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Lineament and pegmatite mapping using landsat TM imagery and aerial photograph data: Kaseba-Katota Area, Serenje district, Central Zambia
… crust started around 1700 Ma followed by tectonic events some of which were responsible for the emplacement of the pegmatites and ended in the Pan-African Orogeny. This thesis therefore, applied remote sensing techniques and GIS techniques for lineament mapping and generation of a …
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The Tuscaloosa Marine Shale: Geologic History, Depositional Analysis, and Exploration Potential
… depositional variance generated from regional tectonic events coupled with the influx of terrigenous sediments from multiple deltas contributing to the prograding oceanfront.</p> <p>The study area yields high economic significance for further hydrocarbon exploration given the estimates of a …
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Structural and stratigraphic relationships between the Numidien formation and underlying formations in the westernmost Mogod Mountains, northern Tunisia
… A minimum of 15 kilometers of southeastward tectonic transport may be demonstrated. The structural style of deformation within the Numidien thrust and that within the underlying rocks indicate that the two tectonic units have been deformed and have been moved separately. Gypsiferous Triassic …
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