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.
Results
Showing 1 to 20 of 29 for “"Drill cores"”.
-
NMR of geophysical drill cores with a mobile Halbach scanner
… scanner is used for analysis of water-saturated drill cores and plugs with diameters up to 60 mm. To provide the analysis, the standard 1D techniques with the CPMG sequence as well as 2D correlation experiments were successfully applied and adapted to study properties of fluid-saturated …
-
Trace element behaviour in a LCT-pegmatite with rare-element mineralization : the Luolamäki pegmatite, a case study
… This pegmatite was chosen due to the existing drill cores and its rare-element mineralization of pollucite, petalite and possibly rubicline.The drill cores were sampled and analysed with wave dispersive x-ray fluorescence (WD-XRF), electron probe microanalyzer (EPMA) and with laser ablation …
-
Influence of climate and the expansion of C4 grasses on sequence-scale cyclicity and landscape development during the late Miocene to Pleistocene of West Texas.
… style. Alluvial stacking-pattern analysis of two drill cores reveals sequence-scale trends in paleosol maturity, cycle thickness, and facies proportions. Stable isotope geochemistry of bulk paleosol samples and pedogenic carbonate suggest C₄ expansion at 7.25 Ma and provide a pCO₂ reconstruction …
-
The Relationship Between Structural and Tectonic Evolution and Mineralization at the Coles Hill Uranium Deposit, Pittsylvania County, Virginia
… and fractures) to regional tectonic activity. Drill cores and outcrops observed in this study show that NE/SW oriented fractures appear to be related to Mesozoic movement along the Chatham Fault. NW/SE oriented fractures cross cut and offset the NE/SW oriented fractures by1 to 2 cm and …
-
Geomicrobiology of the ocean crust : the phylogenetic diversity, abundance, and distribution of microbial communities inhabiting basalt and implications for rock alteration processes
… to definitively identify microorganisms in drill-cores of old (> 15 Ma) ocean crust, however, implies that these once prolific communities may become scarce as the crust ages and moves further away from the ridge axis. Finally, we provide evidence suggesting that these communities are fueled …
-
Geomicrobiology of the ocean crust : the phylogenetic diversity, abundance, and distribution of microbial communities inhabiting basalt and implications for rock alteration processes
… to definitively identify microorganisms in drill-cores of old (> 15 Ma) ocean crust, however, implies that these once prolific communities may become scarce as the crust ages and moves further away from the ridge axis. Finally, we provide evidence suggesting that these communities are fueled …
-
Interpreting Ancient Climate Signals from Sedimentary Archives of Lake Bosumtwi, Ghana
… in these studies were collected from scientific drill cores recovered from Lake Bosumtwi, Ghana, as part of a drilling campaign supported by the U.S. National Science Foundation and the International Continental Scientific Drilling Program.</p> <p>Laminations in sedimentary profiles can represent …
-
An investigation into the complementary capabilities of X-ray computed tomography and hyperspectral imaging of drill core in geometallurgy
… at an early operational stage, ideally during drill core exploration, to avoid risks during the project phase (such as project delays and failure) and operational phases (such as plant instabilities), ultimately affecting the cash flow. The discipline of geometallurgy has arisen to manage the …
-
The fracture and autogenous comminution of quartzite
… grain size of the quartzite. Brazilian tests on drill cores of varying diameters may allow the prediction of the critical size of rock of the mill feed which can survive in a mill of given characteristics.
-
Characterization of Impact Melt Rocks and Hydrothermal Mineralization at the Haughton Impact Structure, Devon Island, Canada: An Investigation of Impacts into Carbonate Targets
… analysis and cathodoluminescence. Recent shallow drill cores at the centre of structure reveal melt rocks unlike those previously identified at Haughton. The first, is a crystalline carbonate-sulfate-silicate melt rock classified based on a series of igneous textures. The second, is a silicate …
-
Kaolinitic weathering zone on Precambrian basement rocks, Red River Valley, eastern North Dakota and northwestern Minnesota
<p> A suite of 26 drill cores recovered from the Red River Valley Drilling Project has provided new information on the Precambrian basement of eastern North Dakota and northwestern Minnesota. Basement rocks in this area consist of intermediate to felsic coarse-grained massive or gneissic rocks, and …
-
Re-Os geochronology and geochemistry of Proterozoic sedimentary successions
… and oil. New Re-Os ORS geochronology from two drill cores indicate that the Proterozoic Atar Group of the Taoudeni basin, Mauritania is ~200 Ma older than previous estimates (1107 ± 12 Ma, 1109 ± 22 Ma and 1105 ± 37 Ma). Furthermore, this data also provides precise Re-Os geochronology data from …
-
Mobile NMR for rock porosity and permeability
… porosity and permeability of water-saturated drill cores and core plugs in a non-destructive way. In addition to their use in the laboratory, the small and light-weight devices are conveniently shipped, e.g. to drilling platforms. They allow rapid wellsite analysis of large-size cores in a …
-
Lithostratigraphic investigation of a Late Devonian carbonate-evaporite sequence; the Duperow Formation, Williston Basin, North Dakota
… lithologic, and well log examination of drill cores and thin sections allows the identification of seven lithofacies within the three members. Lithofacies include; bioclastic wackestone/packstone (LF1), stromatoporoid boundstone/floatstone (LF2), Amphipora boundstone/floatstone (LF3), …
-
Reconstructing long term sediment flux from the Brooks Range, Alaska using shelf edge clinoforms
Laterally extensive, well-developed clinoforms have been mapped in Early Cretaceous deposits located in the northeastern 27,000 km2 of the Colvile Basin, North Slope of Alaska. Using public domain 2-D seismic data, well logs, core photographs, and grain size data, depositional geometries within the …
-
Application of Fluid Inclusions and Mineral Textures in Exploration for Epithermal Precious Metals Deposits
… Madre that have been sampled in the mines and drill cores, suggesting that additional precious metal reserves are likely beneath the deepest levels sampled.
-
A Study of Compaction and Cementation of Sandstones in the Athabasca Basin, Northern Saskatchewan, Canada, and Implications for Uniformity-related Uranium Mineralization
… characteristics of the sandstones from four drill cores (Rumpel Lake, WC79-01, BL-08-01, DV10-001) located in the central part of the basin. Samples were collected from different stratigraphic levels, including the Read, Manitou Falls, Lazenby Lake, Wolverine Point, and Locker Lake …
-
Sequence Stratigraphy and Petrophysics of the late Ordovician Utica-Point Pleasant Interval in the Middle Appalachian Basin, Eastern Ohio and Western Pennsylvania
Approximately 400 well logs and two drill cores from eastern Ohio, western Pennsylvania, and northern West Virginia are used to construct a depositional model of the Utica Shale and associated Upper Ordovician strata. Previous studies of outcrop data from the Cincinnati arch and Jessamine dome …
-
Sedimentology and diagenesis of Lower to Middle Cambrian carbonate platform, Shady Dolomite, Virginia
Drill cores through the Lower to Middle Cambrian Shady Dolomite carbonate platform (600 to 1200 m thick) in the Austinville, Virginia, region allow the evolution of the carbonate platform from a gently sloping ramp, to a high relief, rimmed shelf to be documented. The Shady Dolomite forms the …
-
Coral reefs of the Indo-Pacific and changes in global Holocene
… dating of coral obtained from new drill cores from Rodrigues (Southwest Indian Ocean), Lizard Island and MacGillivray Reef (Northern Great Barrier Reef (NGBR)), helps to reveal the spatial and temporal pattern of Holocene CaCO3 accumulation within these reefs and contributes to the …
Page 1 of 2