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Showing 1 to 14 of 14 for “"Crystalline Bedrock"”.
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DEVELOPMENT OF AN APPROACH TO EVALUATE FRACTURED CRYSTALLINE BEDROCK WATER RESOURCE SUPPLY AND SUSTAINABILITY
<p>Groundwater derived from fractured crystalline bedrock is an important resource in Connecticut. Despite its importance we know very little about this resource. This study was conducted at the Plant Science and Landscape Architecture Research and Education Facility, University of Connecticut, …
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Crystalline bedrock geology of the lower Susquehanna Gorge: Conowingo to Havre de Grace, Maryland
The crystalline bedrock of the lowermost Susquehanna River Gorge, Conowingo to Havre de Grace, Maryland, consists of two discrete structural blocks, each with its own unique history prior to juxtaposition. The southern Havre de Grace Block is a Cambrian magmatic arc association (James Run Formation …
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An Unsteady State Tracer Dilution Method for Characterizing Water Contributing Fractures in Crystalline Bedrock Wells
… contaminants impacting wells in fractured crystalline bedrock requires knowledge of the individual fractures that contribute water to the wells. This typically involves using a sequence of methods including downhole geophysics, flow meters, and straddle packers. These methods are expensive, …
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Aquifer Characterization in the Blue Ridge Physiographic Province
… downward to the underlying variably fractured crystalline bedrock. In these models, interconnected fractures in the crystalline bedrock act as conduits for predominantly downward vertical and limited horizontal flow. Fracture density is depthà limited and correlated with proximity to …
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Paleoseismologic Evidence for Holocene Activity on the Pinto Mountain Fault, Twentynine Palms, California
… estimates inferred from the cumulative offset of crystalline bedrock contacts and structure.</p>
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A drop-in-concept for deep borehole canister emplacement
… nuclear waste in deep boreholes drilled into crystalline bedrock (i.e., "granite") is an interesting repository alternative of long standing. Work at MIT over the past two decades, and more recently in collaboration with the Sandia National Laboratory, has examined a broad spectrum of design …
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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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Evaluation of an Ecohydrologic-Process Model Approach to Estimating Annual Mountain-Block Recharge
… Our work estimated mean annual MBR flux in this crystalline bedrock terrain to be 99,000 m3/d or approximately 19% of annual precipitation. Data analyses indicate that vegetative control on soil moisture flux is significant only at lower elevations and snowmelt is the only significant annual …
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Evaluation of an Ecohydrologic-Process Model Approach to Estimating Annual Mountain-Block Recharge
… Our work estimated mean annual MBR flux in this crystalline bedrock terrain to be 99,000 m3/d or approximately 19% of annual precipitation. Data analyses indicate that vegetative control on soil moisture flux is significant only at lower elevations and snowmelt is the only significant annual …
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Seismic Imaging of a Granitoid-Greenstone Boundary in the Paleoarchean Pilbara Craton
… weathering layer overlying slightly fractured crystalline rocks. These fractures close within 200-300 m depth, and velocity reaches bedrock speeds consistent with expected values of granitoids to the west and volcanic rocks of the Fortescue Group to the east. The best migrated image contains …
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Evaluating Preferential Recharge in Blue Ridge Aquifer Systems Using Saline Tracers
… monitored through soil, saprolite, and fractured crystalline bedrock for a period of 3 months with chemical, physical, and geophysical techniques. Potassium chloride (KCl) and potassium bromide (KBr) tracers were applied at specific locations on the ground surface to directly test flow pathways in …
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Shearing on the Great Glen Fault: Kinematic and Microstructural Evidence Preserved at Different Crustal Levels
… field and microstructural evidence from crystalline bedrock and overlying Devonian sedimentary rocks for brittle upper-crustal shearing on the GGF. However, evidence for high-temperature crystal plastic shearing at deeper crustal levels on the GGF, potentially of Silurian to Early …
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40Ar/39Ar, AFT and (U-Th)/He thermochronologic implications for the low-temperature geological evolution in SE Sweden
… suitability, the geological history of the bedrock in these two areas has been investigated. This study has focused on the thermal evolution, from c. 500 °C to c. 50 °C. 40Ar-39Ar geochronology on hornblende, muscovite and biotite, was applied to determine cooling from c. 500 °C to c. 300 …
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Large-scale hydrological modelling in the semi-arid north-east of Brazil
… about five months. Being mainly characterized by crystalline bedrock and shallow soils, surface water provides the largest part of the water supply. The area has recurrently been affected by droughts which caused serious economic losses and social impacts like migration from the rural regions. The …