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 16 of 16 for “"Crustal Processes"”.
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Evaluating mantle and crustal processes using isotope geochemistry
… to work on a broad range of topics to evaluate crustal and mantle processes. This study presents Re-Os systematics to constrain the composition, formation and age of the lower continental crust and the mantle lithosphere, examines melt inclusion from oceanic island basalts to evaluate the scale …
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Evaluating mantle and crustal processes using isotope geochemistry
… to work on a broad range of topics to evaluate crustal and mantle processes. This study presents Re-Os systematics to constrain the composition, formation and age of the lower continental crust and the mantle lithosphere, examines melt inclusion from oceanic island basalts to evaluate the scale …
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Seismic constraints on shallow crustal processes at the East Pacific Rise
… high-resolution determinations of shallow crustal structure. Three experiments were located within the axial summit caldera (ASC), over 'zero-age' crust. The seismic structure at these three locations is fundamentally the same, with a thin (<60 m) surficial low-velocity (<2.5 km/s) layer, a …
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Seismic constraints on shallow crustal processes at the East Pacific Rise
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1994.
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Upper mantle reflectivity beneath an intracratonic basin: insights into the behavior of the mantle beneath Illinois basin.
… to: (1) remnants or "scars" of sub-crustal processes associated with lithospheric extension or delamination related to the melting of the Proterozoic crust that led to the emplacement of the granite--rhyolite province that underlies much of USA Midcontinent; or (2) deformation caused …
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Deformation and its surface expression in stressed planetary materials
… The final chapter (Chapter 5) investigates crustal processes on Titan, Saturn’s largest moon. This work models how tidal stresses interact with local topographic stresses to create fracture across Titan’s crust, creating pathways for sediment generation and fluid transport.
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Carbon systematics of the Icelandic crust and mantle
… en route to eruption through the crust. Various crustal processes act to modify the geochemistry of melts before eruption, therefore it is important to be able to characterise the effect of these processes to better interpret the volatile signals preserved in erupted products. Pressure, and …
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Isotopic characterization of bedrock, sediments, and minerals as provenance tools: Examples from an inselberg in the Mojave Desert of SE California
… driven by our knowledge and comprehension of the processes which shape the landscape. The source, formation, and transport pathways of sediment are critical components to understanding crustal processes and changes and are often grouped under the broad scope of provenance analysis. Much of what we …
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Vorticity of Flow, Deformation Temperatures, and Strain Symmetry of the Moine Thrust Zone, NW Scotland: Constraining the Kinematic and Thermal Evolution of a Collisional Orogenic System
… kinematic and thermal characterization of a crustal-scale shear zone at the base of the Scandian (435-425 Ma) orogenic wedge. Quartz crystal fabrics, kinematic vorticity (Wm), and strain estimates from the ductile thrust sheets in this region are used to determine how pure and simple shear …
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Uranium-series isotope constraints on magma generation and differentiation in the central Oregon Cascades
… have been dominated by interaction with a lower crustal component, likely a partial melt of mafic lower crust and/or a residual liquid from fractional crystallization of hydrous basalt. Crustal interaction at Newberry, in contrast, is dominated by assimilation of a felsic upper crustal component, …
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Quantifying crystalline exhumation in the Himalaya
… the most visible consequence of tectonic processes. Although the morphology and landscape evolution of mountain belts can be observed due to surface processes, the driving force and dynamics at lithosphere scale are less well understood despite the fact that rocks from deeper levels of …
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Crustal Structure of the Middle Mariana Arc-Back-Arc System
Die kontinentale Kruste prägt unseren Planeten, doch ihre Entstehung ist bis heute umstritten. Intraozeanische Inselbögen gelten als Schlüsselbereich, da sie über Subduktionszonen neue Kruste erzeugen und basaltische ozeanische Lithosphäre in kontinentalähnliche Zusammensetzungen umwandeln. Die …
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Proterozoic thermal and deformational history and geochemical evolution of the 1.4 Ga Priest pluton and its aureole
Paleoproterozoic (1.7-1.6 Ga) supracrustal rocks in the aureole of the 1.43 +/- 0.01 ga Priest pluton provide evidence for a polyphase Proterozoic metamorphic history in central New Mexico. This history involved pre-, syn-, and post-emplacement metamorphic mineral growth. The Priest pluton contact …