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 32 for “"continental collision"”.
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Mountains of wax : continental collision in scaled thermomechanical analogue experiments and data analysis
Thermomechanische Analogmodelle kontinentaler Kollisionen erfordern <br>die Simulation der ganzen Lithosphäre. Für die Skalierung <br>muß der thermische Ausgleich während der Deformation <br>erfaßt werden. Hierfür wird eine neuartige Apparatur <br>zur Deformation thermisch geschichteter Modelle …
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Geochemistry, Geothermobarometry and Geochronology of High-Pressure Granulites and Implications for the Exhumation History of Ultrahigh-Pressure Terranes: Dulan, Western China
… North Qaidam terrane, Western China, represent continental crust that has been subducted ~100 km during continental collision. Adjacent granulites representing burial to ~50 km could either be overprinted eclogites or a separate high-pressure-high-temperature (HP-HT) granulite unit. Overprinted …
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Seismic Studies of the Mantle Transition Zone
For the continental collision zone, I show that due to high VP near the bottom of the mantle transition zone, the contrast in VP across the 660-km discontinuity beneath central Tibet is small (around 3.1%): only about 70% of that beneath the northern Indian shield. This sub-horizontal anomaly of …
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The structural geology of the Naukluft Nappe Complex and its relationship to the Damara Orogenic Belt, South West Africa/Namibia
… plate tectonic processes of subduction and continental collision in the southern zones.
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Deciphering the Tectonics of the Caucasus from Post-Collisional Volcanism
… the Eurasian plate is a well-studied region of continental collision. The Caucasus mountains lie at the centre of the Alpine-Himalayan orogenic belt, and differs from their better studied neighbours by the presence of intense, largely mantle derived post-collisional magmatism. Volcanism began …
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The structural, metamorphic and thermal history of the Sonnblick Dome, southeast Tauern Window, Austria
… the Adriatic microplate was thrust during Alpine continental collision. The igneous precursors to the gneisses formed as granitoids above a subduction zone during the Hercynian. During Alpine continental collision, overthrusting of the African-derived Austroalpine units toward the northwest …
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The timing of prograde metamorphism in the Garhwal Himalaya, India
… controls on the response of the crust to continental collision. However, our understanding of the prograde metamorphic evolution of the orogen remains poor. This thesis builds on recent advances in the study of PTt paths, using garnet chronometry, to better constrain the thennobarometric …
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Testing models of ultra-fast India-Asia convergence : new paleomagnetic results from Ladakh, Western Himalaya
Rapid India-Asia convergence has led to a major continental collision and formation of the Himalayas, the highest mountain range on Earth. Knowledge of the paleolatitude of the Kohistan-Ladakh Arc (KLA), an intermediate tectonic unit currently situated between the converging Indian and Eurasian …
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Seismic attenuation of regional phases in the northern Middle East and the Tibetan Plateau
… I have measured regional phase Q values for two continental-continental collision zones, the northern Middle East and the Tibetan Plateau. The regional phase Q is typically assumed as the intrinsic Q, whose lateral variation suggests temperature structure of the crust and the uppermost mantle. In …
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THE SEDIMENT AND CRUSTAL STRUCTURE OF THE SOUTHEASTERN UNITED STATES
… preserves a detailed geologic record of the continental collision and rifting that has shaped it over billions of years. Currently the SEUS lies on a passive margin far away from ongoing tectonics, yet retains the ability to produce damaging earthquakes. It has long been suspected that the …
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Using 3D geodynamic slab models in tectonic reconstruction
… subduction of the Neotethys ocean prior to the collision of the Arabian continent with Eurasia is reconstructed, and the debates regarding the age of continental collision, slab tearing, and the generation of adakitic magmatism are examined. From the magnitude of reconstructed subducted …
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Using 3D geodynamic slab models in tectonic reconstruction
… subduction of the Neotethys ocean prior to the collision of the Arabian continent with Eurasia is reconstructed, and the debates regarding the age of continental collision, slab tearing, and the generation of adakitic magmatism are examined. From the magnitude of reconstructed subducted …
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Extensional evolution of the central East Greenland Caledonides
… in the overriding plate during Caledonian continental collision through field and laboratory investigations in the central East Greenland Caledonides. During the course of this work, attempts were made to answer some of the outstanding regional and local questions in East Greenland geology. …
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Seismological structure of the Carpathian-Pannonian region of central Europe
… as mechanisms to drive extension within this collisional setting. As part of the Carpathian Basins Project(CBP), a temporary network of 56 broadband seismometers was deployed. With a further 44 permanent broadband seismometers, tomographic inversion of P and S-wave relative arrival-time …
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The crust and upper mantle structure of eastern Anatolia, Turkey from gravity modeling constrained by seismic data
The Eastern Anatolian region is part of a young continental collision zone between the Arabian and Eurasian plates. The lithosphere in Eastern Anatolia is underlain by a low-velocity zone associated with asthenospheric flow in the upper mantle. The asthenospheric flow might have been caused by …
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Geochemical Insights into Crustal Melting in the Bhutan Himalaya
… granitic intrusions are characteristics of many continental collision zones. The processes, sources and timing of melt generation in collision zones are critical to understanding crustal and tectonic evolution. In the Himalaya, multiple Oligocene-Miocene leucogranite bodies intrude the Greater …
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Late quaternary climate changes and landscape evolution in the Northwest Himalaya : geomorphologic processes in the Indian Summer Monsoon Domain
The India-Eurasia continental collision zone provides a spectacular example of active mountain building and climatic forcing. In order to quantify the critically important process of mass removal, I analyzed spatial and temporal precipitation patterns of the oscillating monsoon system and their …
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Active tectonics and earthquake hazards in continental mountain ranges and foreland basins
… understanding the accumulated slip deficit in continental collision zones.
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Magmatic And Tectonic Evolution Of Southern Tibet And The Himalaya
… orogen has become the paradigm for continental collision and is central to deciphering continental tectonics. Neogene extension in the orogen is not predicted by plate tectonic theory, and its significance is widely debated.<br></br><br></br>In the Himalaya, north-south extension is …
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Applying Garnet and Zircon REE Linkages to Determine Timing of P-T Conditions and Tectonic Implications for UHP Eclogites and HP Granulites, Dulan UHP Terrane, China
… terrane in western China hosts rocks that record continental collision, however; the timing of peak P-T conditions in UHP eclogites and HP granulites, and the tectonic significance of their spatial relationship within the Dulan UHP terrane are not well understood. This study, (1) evaluates rare …
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