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 28 for “"crystalline rocks"”.
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Scanning electron microscope study of cracks and pores in crystalline rocks,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1973.
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The effect of pore pressure on the strength of low porosity crystalline rocks,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
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Fracture Initiation and Propagation in Low Porosity Crystalline Rocks: Implications for Excavation Damage Zone (EDZ) Mechanics
… processes of underground openings in hard rocks at depth are commonly associated with introducing some damage to the surrounding rock mass through the initiation and propagation of fractures parallel to the excavation boundary due to disturbance to the in situ stress condition, as well as …
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Characterization of crack propagation and brittle failure induced by discrete, high velocity waterjet impacts in crystalline rocks, The
Includes bibliographical references (pages 297-304).
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Determination of fractured aquifer characteristics from evaluation of pump tests of wells in the crystalline rocks of the Blue Ridge allocthon
The Precambrian age rocks of the Blue Ridge thrust sheet near Roanoke, Virginia, comprise an igneous and metamorphic assemblage with the predominance of porosity and permeability of the formations attributed to secondary factors. Aquifer characteristics of transmissivity, storage coefficient, …
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Clay mineral formation and fluid-rock interaction in fractured crystalline rocks of the Rhine rift system : case studies from the Soultz-sous-Forêts granite (France) and the Schauenburg Fault (Germany)
… history of fractured and faulted crystalline granitic basement in the Rhine rift system, based on the analytical investigation of clay mineral assemblages. It evaluates the argillite mineralizations along faults and fracture zones at key tectonic positions in relation to the upper …
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Heterotrophic Microbial Colonization of the Interior of Shocked Rocks from the Haughton Impact Structure, Devon Island, Nunavut, Canadian High Arctic
… as endoliths, which live in the interior of rocks, escaping or mitigating the hazards of the polar desert and fully utilizing the resources available in the rock environment. The most studied groups of polar endoliths are near-surface phototrophic communities inhabiting porous sedimentary …
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Structural geology of the Macks Mountain area, Virginia
… deformation of an area between highly deformed crystalline rocks of the Blue Ridge structural province and much less deformed sedimentary rocks of the Valley and Ridge structural province. This interval, consisting of lower Cambrian and Precambrian rocks, has been investigated in some detail …
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Application of Electromagnetic Methods to Identify and Characterize Sub-surface Structures Associated with the Coles Hill Uranium Deposit
… Danville Basin to the east from the older crystalline rocks to the west. The location of the Chatham Fault is important to understanding distribution of ore and for developing an effective mine plan. In this study the Chatham Fault location has been inferred from ground conductivity and …
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The Relationship Between Structural and Tectonic Evolution and Mineralization at the Coles Hill Uranium Deposit, Pittsylvania County, Virginia
… westward into the adjacent highly fractured crystalline rocks, precipitating uranium due to oxidation-reduction reactions.
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Geologic and Economic Aspects of Lake Agassiz Clays
… also present. The basement rock is Pre-Cambrian crystalline rocks. </p><p>The Lake Agassiz sediments can be divided into a silt unit and a clay unit. They both were tested for bloating, effervescence, and physical properties. Differential thermal analysis was used to study minerals and impurities …
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Interplay of porous media and fracture stimulation in sedimentary enhanced geothermal systems : Red River Formation, Williston Basin, North Dakota
… systems (EGS) can be installed in both crystalline rocks and sedimentary basins. The Red River Formation (Ordovician), which lies between 3.6 and 4.2 km depth in the Williston Basin, is a viable site for installation of sedimentary EGS (SEGS). SEGS is possible there because temperatures …
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Evaluation of Fracture Flow at the Coles Hill Uranium Deposit in Pittsylvania County, VA using Electrical Resistivity, Bore Hole Logging, Pumping Tests, and Age Dating Methods
… the Chatham Fault, which separates the granitic rocks of the Virginia Piedmont to the west from the metasediments of the Danville Triassic basin to the east. Groundwater at the site flows through a complex interconnected network of fractures controlled by the geology and structural history of the …
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Identification of Recharge Source Areas in a Fractured Crystalline-rock Aquifer in Ploemeur, France
… available groundwater resources within crystalline rocks is pertinent to understanding and predicting resources for ecosystems worldwide. Crystalline-rock aquifers, with favorable structure and climate, can be pumped year-round to meet local domestic demand. The Ploemeur hydrogeologic …
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Interpretation of refraction and reflection stack data over the Brevard fault zone in South Carolina
… between the weathered layer and high velocity crystalline rocks. This refractor is continuous in the Inner Piedmont with occasional vertical offsets. The continuity of the refractor diminishes across the Brevard fault zone. In the eastern Blue Ridge, the refractor is discontinuous with high …
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Seismic Imaging of a Granitoid-Greenstone Boundary in the Paleoarchean Pilbara Craton
… eastern half images 2-3 km of layered volcanic rocks of the Fortescue Group overlying the greenstones. Seismic velocity models created using travel-time tomography suggest a thin weathering layer overlying slightly fractured crystalline rocks. These fractures close within 200-300 m depth, and …
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Radiative Transfer in the Martian Environment: In-Situ Results from the MSL Curiosity Rover and Laboratory Experimentation on Martian Regolith and Crystalline Rock Analogs
… angle for martian analog regoliths and crystalline rock samples. Materials show strong forward or isotropic scattering profiles through the samples. The transmission through the materials is assessed at ultraviolet and visible wavelengths. Kieserite and the majority of the rock samples …
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Paleozoic and Grenvillian structures in the southern Appalachians: extended interpretation from seismic reflection data
… discrimination between Blue Ridge-Inner Piedmont crystalline rocks from underlying Lower Paleozoic shelf strata, thereby allowing the delineation of the Blue Ridge thrust. The revised geometry of the Blue Ridge thrust constrains the top of the shelf sequence beneath the Blue Ridge to depths less …
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Velocity and Q from reflection seismic data
… reference reflections from shallower reflectors, crystalline rocks in South Carolina over the depth interval from about 5 km to 10 km yield values of Qin the range Q = 250 - 300. Non-standard recording geometries ( "Q-spreads") and vibroseis recording procedures are suggested to minimize matrix …
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