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 35 for “"Pacific Plate"”.
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Oblique Seafloor Spreading, the Malpelo Plate Hypothesis, and Cocos-Nazca-Pacific Plate Motion Circuit
… spreading centers of the Cocos-Nazca plate boundary between 91°W and 94°W (α≈9°), and superfast spreading centers of the East Pacific Rise at the Nazca-Pacific plate boundary between 29°S and 32°S (α≈10°) and perhaps between ≈16°S and ≈22°S (α≈4°). Thus, oblique spreading occurs across …
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Late Cretaceous-Cenozoic Accretionary History of Volcanic Arcs and the Bering Oceanic Plateau in the Northwestern in Alaska and Northeastern Russia Constrained by Integration of Geologic, Geophysical, and Radiometric Data
The political division of the northern Pacific plate margin between northeastern Asia in Russia, the Bering Sea, and Alaska and the Aleutian Islands in the USA has slowed the tectonic understanding of this vast, 9,100,000 km2 region. In this study I have compiled geologic, gravity, magnetic, …
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Mantle Wedge Evolution beneath the Northern Mariana Forearc
Subduction of the Pacific Plate beneath the Philippine Sea Plate has created one of the largest intra-oceanic convergent systems on the Earth – the Izu-Bonin-Mariana arc (IBM). To understand the geochemical characteristics of a supra-subduction zone mantle wedge and how it has evolved in response …
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Three-dimensional thermo-mechanical modeling of deformation at plate boundaries : case study San Andreas Fault System
… of the North American terranes towards the Pacific plate and the landward migration of the San Andreas plate boundary. One of the theories suggests that the Pacific plate first cools and captures the uprising mantle in the slab window, and then it causes the accretion of the continental …
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Towards a model of the Cenozoic tectonic development of New Zealand
… of the New Zealand sector of the Australia-Pacific plate boundary. (2) The tectonic setting during the Paleogene. (3) The nature and location, north of the Alpine Fault proper, of the relative plate motion which is evident as dextral fault displacement on the Alpine Fault. (4) The total …
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Uplift history and geomorphic development of the Southern Alps, New Zealand, assessed by fission track analysis
… the Southern Alps. During the late Cenozoic the Pacific plate has been converging obliquely with the Australia plate in South Island, New Zealand. A result of this convergence has been the growth of a major mountain range - the Southern Alps - at the leading edge of the Pacific plate. The results …
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Late Neogene Uplift of the Fairweather Ground on the Basis of Bathymetric and Seismic Data from the Gulf of Alaska
… load is deposited onto the Yakutat block, a microplate that takes up the strike-slip to convergent movement with respect to North America and Pacific plates. Tectonic activity during the last 5 million years has resulted in Eocene rock exposed at the sea floor. High resolution bathymetry data …
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Subsurface stratigraphy and petrology of a cool-water carbonate fracture reservoir - the mid-tertiary Tikorangi Formation, Taranaki Basin, New Zealand
… to a rapidly evolving convergent Australian-Pacific plate boundary, to changes in relative sea level within an overall transgressive regime, to foredeep trough accommodation, to location within a cool-water temperate latitude setting, and to the changing availability and sources of carbonate …
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The origin and tectonic history of the Southwest Philippine Sea
… pole. This is consistent with rotations of the Pacific plate with respect to the magnetic pole and current directions of Philippine- Pacific'relative rotations. Basement depths of 6 km in the West philippine Basin imply that its crustal and/or lithospheric structure is different from Pacific …
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Seismic and numerical constraints on the formation and evolution of oceanic lithosphere
… the lithosphere. The strength of lithospheric plates relative to the underlying mantle enables the surface plate motions and plate boundary processes that characterize plate tectonics on Earth. Surprisingly, we have a relatively poor understanding of the physical mechanisms that make the …
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Characterization of secondary mantle convection from geophysical data and models
… by the shear associated with the lithospheric plate motion, or as helices, formed when sinking cold plumes, falling from the base of the lithosphere are sheared away by the large-scale flow. Our study shows that the secondary convection under the Pacific plate occurs in the form of 3D plumes …
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Sn attenuation in the Northeast China
… continental craton that has been re-activated by Pacific plate subduction and India-Eurasia collision. In this thesis a study of seismic wave attenuation characterized from regional earthquakes in northeast China is presented. Regional phase Sn wave is used to map lateral variations of shear wave …
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Seismic and numerical constraints on the formation and evolution of ocean lithosphere
… the lithosphere. The strength of lithospheric plates relative to the underlying mantle enables the surface plate motions and plate boundary processes that characterize plate tectonics on Earth. Surprisingly, we have a relatively poor understanding of the physical mechanisms that make the …
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Exploration and application of post-infrared high-temperature infrared stimulated luminescence dating techniques: investigation of marine terrace deposits along the northern San Andreas Fault
… Andreas Fault. Corals from the terrace along the Pacific plate, dated with U-series by Muhs et al. (2002), offer an age estimate. Comparison of the pIRIR ages to the U-series ages yield an underestimation, suggesting the pIRIR method may be more useful as a means of correlating terraces across the …
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Electrofacies, elemental composition, and source rock characteristics along seismic reflectors of the Vaca Muerta Formation in the Loma La Lata area, Neuquen Basin, Argentina
… by back-arc subsidence of the crust as the Pacific Plate subducted beneath the South American Plate during and after the break-up of the Gondwana supercontinent. The Vaca Muerta was recognized and named in early stratigraphic studies of the basin in the 1930s. The production of hydrocarbons …
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Receiver function imaging of mantle transition zone discontinuities beneath Alaska
"Subduction of tectonic plates is one of the most important tectonic processes, yet many aspects of subduction zone geodynamics remain unsolved and poorly understood, such as the depth extent of the subducted slab and its geometry. The Alaska subduction zone, which is associated with the subduction …
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Tectonic evolution of Pegasus Basin and the Hikurangi Trench, offshore New Zealand, The
… between oblique southwest subduction of the Pacific Plate below the East Coast of the North Island of New Zealand, and the strike-slip faulting that dominates the majority of the South Island of New Zealand. The transition from this strike-slip zone into the actively subducting Hikurangi …
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Late Cenozoic Exhumation in a Transpressional Setting: Fairweather Range, Alaska
… occurred at 5 Ma with changes in climate and plate obliquity. Although cooling ages reveal no coherent regional pattern relative to known structures, they indicate the margin accommodates a significant component of pure shear and is slip-partitioned. The resolved magnitude of convergence in …
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The origin of the ninetyeast ridge and the northward motion of India, based on DSDP paleolatitudes
… of similar ages from different sites on the same plate, estimates of paleolatitude from the skewness of marine magnetic anomalies, and continental paleopole. positions. Using such comparisons, a new paleomagnetic pole of upper Cretaceous age has been defined for the Pacific plate. A middle …
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Neogene paleomagnetism and geodynamics of the Hikurangi margin, East Coast, New Zealand
… of Neogene deformation in the New Zealand plate boundary region, and potentially offer fundamental insights into the rheology of continental crust. Extensive paleomagnetic sampling along the Hikurangi margin, on the East Coast of the North Island, has provided new insights into the …
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