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 18 of 18 for “"Sedimentary geology"”.
-
Spatial and statistical analysis approaches to investigate the oral bioaccessibility of potentially toxic elements in Northern Irish soils
… clay, peat, anthropogenic, igneous and sedimentary geology components each exerting unique controls over trace element oral bioaccessibility. <br/><br/>Clay and peat factors were related to higher trace element bioaccessibility while factors linked to igneous minerals generally were …
-
Sedimentation of the Siluro-Devonian clastic wedge of Somerset Island, Arctic Canada
Abstract not available.
-
Jurassic limestone-marl sequences in northern spain: detecting diagenetic signals using rare earth and trace elements
Mesozoic rhythmically bedded limestone and marl sequences have been traditionally interpreted to be the result of eustatic sea-level changes related to Milankovitch cycles. An alternative interpretation supports the idea that these calcareous alternations are a product of diagenetic bedding. …
-
Sequence Stratigraphy, Depositional Environments, and Regional Mapping of the Late Devonian Interval, Upper Three Forks Formation, Sanish Member, and Lower Bakken Shale, U.S. Portion of the Williston Basin
Cores of the Late Devonian upper Three Forks, Sanish, and lower Bakken units from eight wells were examined and described at the North Dakota core depository. Core descriptions, wireline log correlation and mapping, and X-ray diffraction (XRD) data were integrated to recognize seven facies: The …
-
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 …
-
The Karoo sand sea in changing climates: Early Jurassic interdune lakes and erg dynamics in southern Africa
… through time. This thesis investigates the sedimentary geology of the southern extension of a vast ancient desert system that was active over Pangaea and formed part of one of the largest known sand seas in Earth's history. The Lower Jurassic Clarens Formation in the main Karoo Basin of …
-
Trace Element Geochemistry of Compositionally Layered Impact Spherules
Impact spherules are sand-sized spherical particles that have been interpreted to have formed by the cooling, crystallization, and quenching of melt droplets condensed from vapor plumes that are created during large meteor impacts. Spherules may be deposited globally as unique marker beds, such as …
-
Influence of Organic Matter Source, Abundance, and Growth Habit on Depositional Textures and Associated Pore Attributes of Hypersaline Lacustrine Microbial Deposits (Holocene, Bahamas)
Discovery of lacustrine microbialite reservoirs in South Atlantic pre-salt has motivated the search for analogs for perspectives on their deposition and initial porosity. Although previous efforts mapped spatial patterns and produced facies models of large microbial lacustrine systems, details of …
-
Diagenetic controls on porosity, thermal history, and hydrocarbons in the Wolfcamp A, eastern Midland Basin, Texas
… – 0.707846) suggest a fluid origin from a sedimentary basin rather than basement. The most likely source for the hydrothermal fluids is the much deeper Val Verde Basin. A modern geothermal gradient map shows a high-gradient plume, directed northward from the Val Verde Basin, with NE-SW- and …
-
Hydrodynamic Controls on Sedimentology and Geomorphology of Marine-Carbonate Ramps: Insights from a Holocene Analogue, Northern Yucatán Shelf, Mexico
As one of the end-members of carbonate platform types, carbonate ramps have long been characterized and interpreted with regard to large-scale controls such as tectonics, sea level, climate, and biota. Yet, details on the impacts of oceanographic processes on facies patterns of ramps remains …
-
Petrography and paragenesis of diagenetic mineral phases in cherty and dolomitic spiculite strata, Mississippian, South-central Kansas
Mississippian strata in four cores from three different locations in southcentral Kansas (Rhodes field, Wellington field, and a "wildcat" well in Comanche county) were used to investigate the depositional environment, and the diagenetic history in variable cherty and dolomitic sponge-spicule-rich …
-
PALEOPEDOLOGY AND PALEOGEOMORPHOLOGY OF THE EARLY OLIGOCENE ORELLA AND WHITNEY MEMBERS, BRULE FORMATION, WHITE RIVER GROUP, TOADSTOOL GEOLOGIC PARK, NEBRASKA
Understanding local and regional reactions to the global Eocene-Oligocene climate transition is a continuing challenge. The White River Group in the North American midcontinent preserves dynamic fluvial, volcaniclastic and lacustrine facies that yield to aeolianites. To test whether this shift in …
-
Effects of Sedimentologic and Stratigraphic Heterogeneity on Production in Carbonate Reservoirs: An Integrated Outcrop, Synthetic Geologic Modeling, and Flow Simulation Study
Most geoscientists recognize, characterize, and understand the many scales and types of heterogeneity in carbonate reservoirs; however, systematic quantitative assessment of the impact of this range of geological variations on production from carbonate reservoirs is rare. To explore and quantify …
-
Stable isotope paleohydrology of pedogenic carbonates in the Wayan Formation (Albian) from the wedge-top depozone in the North American Cretaceous Western Interior Basin
Determining the presence and effects of orogenic rain shadows on paleoclimate is challenging, but critical to understanding overall moisture and heat transport. This thesis presents new data and interpretation for the climate system of the Cretaceous greenhouse world, which is a major keystone in …
-
Modeling the Lafourche Delta network in the Mississippi Delta Complex
<p>The distributary channel network morphology on deltas is important for the delta evolution study because channels are the primary conduit for carrying and distributing water, sediment, and nutrients to the coast. Numerical models of river deltas and their channels have improved remarkably over …
-
The Quaternary evolution of the mid-Norwegian continental margin
… subglacial thermal structure. Third, Quaternary sedimentary processes both down and along the continental slope are examined. Identification of more than 300 buried slope landforms provides a process- based palaeo-environmental reconstruction. The early Quaternary slope record (2.7-0.8 M.y. ago) …
-
Taphonomy of a Lance Formation(Maastrichtian, WY) Dinosaur Bonebed with a Focus on Tooth Traces
<p>The Rose Quarry bonebed found in the Maastrichtian Lance Formation of eastern Wyoming possesses a complex blendof taphonomic signatures. Disarticulated, disassociated, fragmented bones of various states of abrasion from dinosaurs, turtles, and crocodilians are clustered together in a channelized …
-
Dynamical Sedimentary Models of Shallow Marine Environments
… a contribution of quantitative, dynamical sedimentary modeling to the analytical understanding of sedimentary processes in shallow marine environments. The dynamical sedimentary models in this treatise numerically simulate the sedimentary processes from an event time scale, based on the …