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 27 for “"Sedimentary environments"”.
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Discrimination of sedimentary environments based on particle size statistics
Digitized by Kansas Correctional Industries
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Discrimination of sedimentary environments based on particle size statistics
Digitized by Kansas Correctional Industries
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Microtextures of Cyanobacterial Mats in Siliciclastic Sedimentary Environments (Modern & Ancient): Applications to the Search for Life on Mars
… of life and its habitats. 'Microbially induced sedimentary structures (MISS)' are formed by benthic cyanobacteria in shallow-marine settings by the interaction of the microbiota with physical sediment dynamics. MISS are found exclusively in siliciclastic sedimentary environments, setting them …
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ΠΕΡΙΒΑΛΛΟΝΤΑ ΙΖΗΜΑΤΟΓΕΝΕΣΗΣ ΚΑΙ ΠΑΓΕΤΟΕΥΣΤΑΤΙΚΕΣ ΚΙΝΗΣΕΙΣ ΤΩΝ ΤΕΤΑΡΤΟΓΕΝΩΝ ΑΠΟΘΕΣΕΩΝ ΤΗΣ ΠΕΡΙΟΧΗΣ Ν. ΜΑΝΩΛΑΔΑΣ-ΛΕΧΑΙΝΩΝ
THE STUDY OF THE SEDIMENTARY ENVIRONMENTS AND OF THE GLACIAL- EUSTATIC MOVEMENTOF THE QUARTERNARY DEPOSITS IN THE MANOLADHA- LECHEINA AREA HAVE GIVEN THE FOLLOWING CONCLUSIONS: 1. THE STUDIED SEDIMENTARY SEQUENCES WERE DEPOSITED LATER THAN MID- PLEISTOCENE AND NOT DURING UPPER PLIOCENE, AS IT WAS …
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The Geologic and Archaeological History of the Dickie Carr Site 41PR26
… Included are analyses of the stratigraphy, sedimentary environments, and soils of the locality. A regional comparison is made with respect to the Late Quaternary geology of the upper Trinity River basin, Texas to interpret the geologic data. Two stratigraphic units were identified that …
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Studies of sediments in a tidal environment
Five sedimentary environments in Plymouth Sound, S.W. England, are defined by side-scan sonar surveys calibrated by direct sampling by SCUBA divers: (i) uniform mud depocentres, (ii) areas of continual sediment reworking, (iii) areas of relict sedimentation, (iv) areas of episodic deposition and, …
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Applied Geochemistry, Geochronology and Biostratigraphy: Case Studies from the 38th Parallel Structures in Missouri and Orange Basin, Offshore Western South Africa
… and palynological material of mixed ages and environments reflect the effects of meteorite impact on the sedimentary environments and stratigraphy.</p> <p>Another study utilized the palynomorph, palynofacies and foraminiferal contents of 43 samples from four wells in the Orange Basin located …
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Environmental drivers of coastal evolution
… thesis, I leverage sediment transport modeling, sedimentary field data, and geospatial analysis to constrain the influence of specific environmental drivers of coastal change since the last deglaciation. I present case studies from near-field (North Atlantic) and far-field (tropical Pacific) …
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Temporal interactions with flamingo foraging plasticity: ecological effects on basal resources and benthic heterogeneity
… role of Greater Flamingos as predators in marine sedimentary ecosystems. The specific aim was to test the long-term effects of different foraging structure sizes (which is a subtle form of foraging plasticity) on sedimentary assemblages following foraging disturbances. In situ comparisons of large …
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Theory and Evolutionary Evidence of the Autocatalytic Oxygenation of Earth’s Surface Environment
… (POOM) produced by oxidative metabolisms in sedimentary environments. This positive feedback derived from oxidative metabolisms is demonstrated via a mathematical model in this thesis. Its relevance to the rise of atmospheric O₂ crucially depends on the existence of POOM-producing oxidative …
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Sedimentology and tectonic implications of the Late Proterozoic to Early Cambrian Chilhowee Group in southern and central Virginia
… attenuation controlled the distribution of sedimentary environments during transgression. On the most attenuated crust to the east, initial transgressive facies consist of tidal sandwave and sandridge deposits intercalated with proximal and medial braid-pIain deposits. As transgression …
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The Carboniferous Courceyan-Chadian) Sedimentary Facies Mosaic of the Keel -Ardagh Area of County Longford, Eire
The stratigraphic relationships and sedimentary environments of the Silurian, Devonian and Lower Carboniferous lithologies in the Keel area are deduced and described. This was accomplished by the analysis of over 10.000M. of diamond drilled core from the area. <br/><br/>The oldest rocks are …
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Megaturbidites and the late Quaternary regional sedimentology of the eastern and central Mediterranean Sea
… shallow platform creating smaller, localised sedimentary environments. Climate-controlled bottom currents scour the region, creating sediment drifts (contourites) with heightened sedimentation rates via a process herein termed '<i>bottom current flow lofting</i>' and interaction with downslope …
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Ανασύνθεση παλαιοπεριβάλλοντος σε παράκτιες γεωμορφές της νότιας Κύπρου με την χρήση τεχνικών φωταύγειας
… a very advantageous technique in dating sedimentary formations, in which their luminescence signal has restarted during their formation. Sedimentary environments contain amounts of radioactive isotopes of elements such as potassium, uranium and thorium. Their decay produces ionizing …
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Distribution of Foraminifera and Pollen in Coastal Depositional Environments of the Southern Delmarva Peninsula, Virginia, U.S.A.
… a wide variety of barrier island system subenvironments. This study investigates whether 20 <em>a priori</em> subenvironments can be distinguished from each other on the basis of abiotic environmental variables, pollen assemblages, living foraminiferal populations, and total (living plus …
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Numerical Modelling of Sediment Delivery from Tidewater Glaciers to the Marine Environment
Glaciated fjords are dynamic sedimentary environments with high deposition rates, thus providing high-resolution sedimentary records of deglaciation. This thesis introduces two numerical models, SedBerg and SedPlume, developed to simulate marine sedimentation from tidewater glaciers for the …
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Solute Chemistry and Isotopic Investigation of the Groundwater Flow Paths in Honey Lake Basin, Lassen County, California and Washoe County, Nevada
… then flows through alluvial fan and stream sedimentary environments and eventually flows through lacustrine and playa sediments in the closed basin. This investigating characterizes geochemical evolution of groundwater flow from both mafic and granitic terrains to lacustrine sediments with …
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The effects of Fe(III) reduction on biodegradation of fuel oxygenates and chlorinated ethenes
… Fe(III) reducing conditions are dominant in many sedimentary environments. However, the effects of Fe(III) reduction on biotransformation of MTBE/TBA and chlorinated ethenes are not well understood. This research investigated the biodegradation of these contaminants and related microbial ecology …
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