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Physical Sciences and Mathematics Commons™
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- <p>Geophysics<br />Microbiologically influenced corrosion</p> (1)
- Anisotropy<br />Shear waves (1)
- Biogeophysics (1)
- Clayton Formation (1)
- Geology, Stratigraphic -- Cretaceous<br />Geology, Stratigraphic -- Paleogene<br />Paleontology -- Missouri<br />Palynology -- Missouri<br />Sequence stratigraphy (1)
Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Deciphering Climate From The Characterization Of Ring Width, Carbon, And Oxygen Isotopes In Latewood Tree-Ring Cellulose, Big Thicket National Preserve, Texas, Usa, Daniel Bruce Lewis
Deciphering Climate From The Characterization Of Ring Width, Carbon, And Oxygen Isotopes In Latewood Tree-Ring Cellulose, Big Thicket National Preserve, Texas, Usa, Daniel Bruce Lewis
Doctoral Dissertations
Trees are excellent archives of paleoclimatic information. They can preserve records of past temperature, precipitation, drought, and extreme weather events. The focus of this dissertation is to use tree ring width, carbon isotopes, oxygen isotopes from multiple trees to characterize climate variability and the tree-ring tropical cyclone record. Living longleaf pine trees (Pinus palustris Mill.) were sampled from the Turkey Creek and Big Sandy Creek Units at Big Thicket National Preserve, Texas. Annual tree rings were measured and assigned yearly calendar dates. The latewood portion of each annual ring was shaved with a scalpel, and alpha-cellulose was extracted for …
Assembling The Blue Ridge And Inner Piedmont: Insights Into The Nature And Timing Of Terrane Accretion In The Southern Appalachian Orogen From Geologic Mapping, Stratigraphy, Kinematic Analysis, Petrology, Geochemistry, And Modern Geochronology, Arthur James Merschat
Doctoral Dissertations
Detailed geologic mapping, SHRIMP U-Pb zircon geochronology, geochemistry, petrology, and structural and kinematic analyses were applied to decipher the structure, tectonic heredity, and Paleozoic accretionary history of suspect terranes of the southern Appalachian Blue Ridge (BR) and Inner Piedmont (IP). Detailed geologic mapping in the Waynesville and Sam Knob 7.5-minute quadrangles recognized the Great Balsam Mountains window cored by sillimanite I and II zone Dahlonega gold belt rocks, overthrust by migmatitic biotite gneiss of the Cartoogechaye terrane to the northwest, and migmatitic Tallulah Falls Formation of the Tugaloo terrane to the southeast. Suspect terranes of the BR and IP consist …
Crustal Modification By Tectonic Events And Upper Mantle Anisotropy Beneath The Midcontinent Rift And New Madrid Seismic Zone: Insights From Receiver Function Studies And Teleseismic Shear Wave Splitting, Moikwathai Moidaki
Doctoral Dissertations
"The earth's crust and upper mantle have been continually modified by tectonic processes such as rifting, earthquake activity. In this dissertation, shear wave splitting and receiver function techniques were employed to study the extent of crustal and upper mantle modifications beneath the New Madrid Seismic Zone (NMSZ) and the Midcontinent Rift (MCR). Shear wave splitting analysis in the MCR reveals the presence of fossilised anisotropy along the rift axis...In the NMSZ, anticipated rift-parallel fast directions associated with vertical magmatic dikes or along-rift flow, rift-orthogonal fast directions from small-scale convection, or reduction in splitting times as a result of vertical asthenospheric …
The Cretaceous-Paleogene Transition In The Northern Mississippi Embayment, S.E. Missouri: Palynology, Micropaleontology, And Evidence Of A Mega-Tsunami Deposit, Tambra L. Eifert
The Cretaceous-Paleogene Transition In The Northern Mississippi Embayment, S.E. Missouri: Palynology, Micropaleontology, And Evidence Of A Mega-Tsunami Deposit, Tambra L. Eifert
Doctoral Dissertations
"Upper Cretaceous to lower Paleogene sedimentary rocks in Southeastern Missouri record the northwest extension of the Mississippi Embayment, yet very little information exists about them due to lack of exposures. Access to borehole and trench material and well logs provided an opportunity to study the sedimentology, palynology and micropaleontology of the three formations spanning the Cretaceous-Paleogene (K-Pg) boundary interval: Owl Creek (Cretaceous) and Clayton and Porters Creek (Paleocene). Lithologic features, palynomorphs (mainly spores, pollen, dinoflagellate cysts), dispersed organic matter, and foraminifera were used to interpret biostratigraphy, paleovegetation, paleoclimatic and depositional conditions, thereby creating a framework upon which further questions involving …
Investigating The Impact Of Microbial Interactions With Geologic Media On Geophysical Properties, Caroline A. Davis
Investigating The Impact Of Microbial Interactions With Geologic Media On Geophysical Properties, Caroline A. Davis
Doctoral Dissertations
"The goals of this study were to investigate the effect of: (1) microbial metabolic byproducts, microbial growth, and biofilm formation on the low frequency electrical properties of porous media, (2) biofilm formation on acoustic wave properties, and (3) the natural electrical (self-potential) signatures associated with an in-situ biological permeable reactive barrier (PRB). The results suggest: (1) increases in electrolytic conductivity are consistent with increased concentrations of organic acids and biosurfactants; (2) mineral weathering promoted by organic acids causes increases in electrolytic conductivity, concomitant with increases in major cation concentrations; (3) interfacial conductivity generally parallels microbial cell concentrations and biofilm formation; …