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Showing 1 to 12 of 12 for “"Crack-seal"”.
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Fracture Growth Kinematics in Tight Sandstone Reservoirs
… growth of these fractures, I reconstructed the crack-seal opening history for multiple cement bridges sampled at different distances from the tip of three opening-mode fractures in Travis Peak Sandstone of the SFOT-1 well, East Texas. Crack-seal cement bridges have been interpreted to form by …
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Gold and Base Metal Mineralization, Hydrothermal Alteration and Vein Paragenesis in the Spring Valley Deposit, Pershing County, Nevada
… interpretation. Pre-ore ataxial and ore-stage crack-seal and non-directional quartz veins were identified. Ataxial veins are composed of distinctive fibrous quartz and are associated with moderately to strongly pervasive silicification. Many trend northwest, suggesting formation during …
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Fluid flow and deformation history of the Denver basin, CO region: fluid inclusions, U-Pb geochronology and isotope geochemistry of calcite-filled fracture cements in the Niobrara Formation
… obtained from several fracture fill types (e.g., crack-seal-slip, crack-seal and crack fill cements, tectonic stylolite-associated, joints) are consistent with multiple fluid flow events. Carbon and oxygen isotopic data indicate rock-water interaction with connate pore fluids. Strontium isotopic …
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Geomechanical aspects of fracture growth in a poroelastic, chemically reactive environment
… is observed to consist of a series of crack-seal processes indicating incremental stop-start growth. Growth timing is on the scale of millions of years based on recent natural fracture growth reconstructions. These time scales are compatible with some model scenarios. My newly developed …
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REGIONAL STRESS REGIME STUDY OF EAST TEXAS BASED ON ORIENTATION OF FRACTURES IN THE WECHES FORMATION
… and are predominantly opening mode, indicated by crack-seal formation, steep dip (700 – 900) and a lack of shear movement. Slickenlines are visible on some fracture planes; however, their bearings show random orientation indicating unloading movement during erosion. Crosscutting relationships with …
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Developing pavement preservation and mitigation strategies using Pavement ME design guide for Rhode Island DOT
… Roughness Index (IRI), Longitudinal Cracking, and Permanent Deformation (Rutting) in both the asphalt layer and the total structure were predicted using Pavement ME to determine the sensitivity of flexible pavement performance with varying pavement parameters, such as thickness of the …
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Aspects of material transport and polycrystal growth in fractures
The thesis investigates fracture sealing processes from micro- to basin scale. Chapter 2 describes the microstructural evolution of fracture sealing using a self-designed see-through apparatus. Analogue material is used to visualize and model sealing processes on a microscale, which is quantified …
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Buffalo Canyon: An Oligocene Greisen-Like Intrusion-Related Gold Deposit in the Union Mining District, Nye County, Nevada
… gold within low sulfide, 1-10cm thick, sheeted, crack-seal quartz veins with locally developed sericite-tourmaline envelopes define the bulk of the Everson gold mineralization. Other gangue minerals in these veins include muscovite, tourmaline and fluorite. The veins have a Au-Te-(Mo-Bi-Sn) …
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Aspects of faulting and fracturing in brittle lithologies
… of vein and fault systems is characterized by re-sealing of the fractures by calcite cementation. Although restoring the systems strength to large parts, the successive fracturing events show signs for mechanical interaction, leading to enhanced fragmentation among the fault strands. This …
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Rb-Sr Alter und Sr-Pb Isotopencharakteristik von Gangmineralisationen in paläozoischen Gesteinen am Nordrand des linksrheinischen Schiefergebirges (Raum Stolberg-Aachen-Kelmis) und Vergleich mit den rezenten Thermalwässern von Aachen-Burtscheid
… and the carbonates generally in the centre. Crack-seal processes indicate brittle deformation and multiple reactivations of the opening. The chemical compositions of the chlorite from veins of the first and second cored section of the well indicate formation temperatures of 290°C to 370°C. …
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Aspects of deformation in a fold-thrust belt: veins and backstop evolution
… fibrous slip lineations, formed by micro-scale crack-seal deformation. However, this study shows that they are actually blocky, overlapping, grooved, wedge-shaped veins. The wedges grow incrementally along their length in a direction parallel to the slip direction of the fault. The lineations …
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Gold mineralization in the Um El Tuyor area, South Eastern Desert, Egypt
… peeled off and incorporated during incremental (crack-seal) vein growth. vii Gold occurs as inclusions or within the lattice in arsenopyrite and arsenian pyrite, commonly in association with subordinate sphalerite, chalcopyrite, and pyrrhotite in the auriferous quartz veins. Another, high …