Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
To better constrain the timing of panda's dietary shift from omnivorous to bamboo-exclusive herbivores, this study analyzed stable isotopes of carbon and oxygen in tooth enamel samples from two pygmy pandas from Yanliang Cave (early...
Two major thrust systems are located along the eastern Blue Ridge â western Blue Ridge boundary in the Alabama and Georgia Appalachians. The pre-metamorphic Hillabee thrust is near the trailing edge of the Talladega belt thrust sheet...
The study conducted U-Pb isotopic dating of the pitchblende mineralization of the Coles Hill uranium deposit in Pittsylvania County, VA. The ore body is found along the Chatham fault and within the Martinsville Igneous Complex. In...
The Abbotsford 7.5’ quadrangle resides entirely within the Dadeville complex, a volcanic arc complex located in the Alabama-Georgia Inner Piedmont region of the southern Appalachian mountain belt system. The Dadeville complex has been...
Lateral distribution of detrital clay minerals in Lower Cretaceous sediment, western North Atlantic and its continental margin
Description:
Fine grained sediment from Lower Cretaceous turbidites (DSDP Site 603) and their correlative deltaic deposits (Baltimore Canyon Trough) were compared mineralogically and texturally. The shelf sediment is coarser grained than deep sea... In deep-sea turbidites, smectite dominates the $<$0.5 micrometer fraction and illite is most abundant in coarser clay fractions. Smectite level is highest in clay-rich sand beds and in clay rip-up clasts, indicating it has been reworked... Previous studies of the clay mineral composition of Lower Cretaceous western North Atlantic sediment hypothesized extensive vertisols along the eastern North American margin to account for high smectite levels, but the results of this... Possible sources for pelagic smectite include Early Cretaceous volcanic ash derived from the New England-Quebec volcanic event, from andesitic volcanism in Mexico, and possibly more extensive exposure of syn-rift diabase and associated...
Rare earth elements (REEs), yttrium and uranium are important industrial resources in many technology sectors; therefore, demand and production will likely continue to increase. Increased international market prices have led to new...
Department of Energy (DOE) proposed an in situ remediation approach to radioactive metal contaminants in DOE complex through calcite mineral precipitation facilitated by hydrolysis of urea (ureolysis). One of the ureolysis products, ...
Paleozoic history of the Nantahala and Brasstown formations of the basal Murphy belt, southwesternmost North Carolina and northernmost Georgia
Description:
The Murphy belt of Georgia and North Carolina is located in the western Blue Ridge of the southern Appalachians. The general structure is a first generation, northeast trending, isoclinal synclinorium, overturned to the northwest.... These rocks were polydeformed and were metamorphosed up to staurolite grade, but many primary structures are preserved. Planar-tabular cross bedding, asymmetric ripple marks, penecontemporaneous contortion, rip-up clasts, and... Although direct correlation is complicated by numerous faults, the Early Cambrian Chilhowee Group, overlain by the Shady Dolomite, in the western boundary of the Blue Ridge is probably correlative to the Hiwassee River Group. From...
The Silurian was a dynamic time of climatic transition punctuated by multiple biotic crises and global carbon cycle perturbations. The most severe of these biotic crises was the late Silurian (Ludfordian) Lau/Kozlowskii extinction event ...
Mercury Isotopic Composition of Fish, Including Gag Grouper (Mycteroperca microlepis) and Red Snapper (Lutjanus campechanus) as Constraints of Mercury Cycling in the Northern Gulf of Mexico
Mercury is a naturally occurring, pervasive element in the environment, with many chemical forms. Toxicology, environmental cycling and retention, and production of mercury by industrial processes and natural and manufactured emissions...
A significant challenge in groundwater reactive transport modeling is to develop scale-appropriate parameters to represent physical and chemical heterogeneities that impact solute migration estimates and predictions. This dissertation...
Calcareous nannofossils and the Cretaceous-Tertiary boundary crisis
Description:
The objectives of this study were to quantitatively analyze calcareous nannofossil assemblages across the Cretaceous/Tertiary (K/T) boundary of several sections to determine the nature of nannoplankton extinctions and to compare the...
LEAD AND SULFUR ISOTOPE SYSTEMATICS IN SULFIDE DEPOSITS OF THE PIEDMONT AND BLUE RIDGE PROVINCES OF THE SOUTHERN APPALACHIANS
Description:
Lead isotope ratios of galenas from stratabound massive sulfide deposits in upper Precambrian metasediments of the Blue Ridge (BR) geologic province are too radiogenic for their presumed synsedimentary, late Precambrian age. A positive... Lead isotope ratios of galenas from Piedmont province polymetallic massive sulfide (PMS) deposits define a trend of decreasingly ensialic volcanism from northeast to southwest. A regression through the data has a slope that corresponds... Rocks and ores from the southern Appalachians have lead isotope patterns that suggest three distinct isotope provinces. Rocks and vein deposits of the Blue Ridge and Inner Piedmont appear to be dominated by lead derived from Grenville...
The Jackson's Gap Group is a thin section (~3 km wide) of sheared, compositionally interlayered metamorphic rocks spanning from west Georgia to central Alabama, representing the southernmost extent of the Brevard Zone. The...
In groundwater modeling, the term "post audit" refers to a method of verifying simulated (predicted) data produced by a groundwater model against analogous measured data. According to Anderson et. al., (2015), evaluation of model...
Alteration effects associated with Mesozoic diabase intrusives and their host rocks in rift basins from Maryland and Virginia
Description:
Mineralogical and geochemical effects of alteration were studied in three early Mesozoic diabase/host-rock systems: (1) the Rocky Ridge dike and aureole, Gettysburg basin, Maryland; (2) the West Gainesville and Nokesville diabase sheets... Observed mineral reactions in the diabase are consistent with relative mobilities; the dominant mechanisms for this mass transfer are apparently infiltration metasomatism and intergranular diffusion. Relative mobilities of cations can be...
Lake Jackson in Leon County Florida is a shallow perched dissolution lake, which sits above the Cody Scarp and is formed from the coalescence of sinkholes. Lake Jackson currently has two open sinkholes, Porter Sink and Lime Sink....
Utilizing Indian Ocean Calcareous Nannofossil Biostratigraphy of Miocene Sediments to Investigate Tectonic and Climatic Forcing during the Evolution of the Himalayas
The geological history of Himalayans and Tibetan Plateau is important for understanding how our planet evolves, and how geological structures can have local and global effects on climate and floral and faunal evolution of a system. This...
Tectonostratigraphy, Geochemistry, and Geochronology of the Dadeville Complex of Alabama and Georgia: The Southern Appalachians Link to the Taconic Orogeny and Associated Suprasubduction System
Taconic orogenesis along the eastern Laurentian margin was a dynamic tectonic event during the Ordovician that has been difficult to reconcile until as of late. The record of the Taconic orogeny is complex, and each section of the...
The objective of this study is to study spatial and temporal paleontological distributions as they relate to the histories of Ninetyeast Ridge and Broken Ridge from ODP Leg 121. This study is important for establishing connections...
Lane (2001) proposed that the flow from Lost Creek contributed to the discharge of Spring Creek Springs via an unverified conduit system similar to the verified conduit system that contributes flow to Wakulla Spring. In order to...
The dissertation reports a series of hydrological studies that relates to seawater intrusion in a karst aquifer. In the Woodville Karst Plan (WKP), karst conduit system is well developed and directly open to the Gulf of Mexico that...
GEOCHEMISTRY, MINERALOGY AND ORIGIN OF MESOZOIC DIABASE DIKES OF VIRGINIA
Description:
Mesozoic diabase dikes of Virginia, part of the Eastern North America dike swarm, display a wide variety of mineralogical and chemical characteristics, representative of most mineralogical and chemical groups described from other... Petrographically, the diabases can be classified into three groups, which also display some geochemical distinctions. The OSB group is characterized by abundant olivine as a phenocryst and/or groundmass component and the presence of a Cr... Major- and compatible trace-element geochemical trends show that typical SGA-group samples can be derived by crystallization of approximately 17-20% olivine with minor spinel from a magma similar in composition to primitive OSB-group... OSB-group samples with compositions that are primitive with respect to major- and compatible trace-element chemistries display a wide and continuous range of incompatible trace-element (ITE) contents and ratios. While some of this...
Understanding the chemical and biological innovation and evolution of the global ocean is pivotal in understanding the processes involved in the evolution and proliferation of early life on Earth and potentially habitable exoplanets....
International Ocean Discovery Program (IODP) Expedition 355 drilled two sites (U1456 and U1457) in Laxmi Basin, located in the eastern Arabian Sea. The primary objective of Expedition 355 is to better understand the impact that the...
Investigation and Interpretation of Variations in NE Gulf of Mexico Nannoplankton Assemblages Following the Macando Well Blowout: Months of August-November
The biodiversity and biomass of coccolithophore species observed in the NE Gulf of Mexico during the months of August through November from 2011 to 2013 are quite dynamic. Following the Macondo well blow out in 2010, analyses have been...
Calcareous nannofossils and stable isotopes were analyzed to determine the timing and causes of extensive Miocene debris flows and Oligocene slumps recovered by Ocean Drilling Program (ODP), cruise Leg 207 to Demerara Rise along French...
Quantifying the Effects of Increased Storminess and Sea-Level Change on the Morphology of Sandy Barrier Islands along the Northwestern and Atlantic Coasts of Florida
The ability to accurately quantify shoreline variability along sandy beaches is essential in order to establish aggressive mitigation strategies, based on recent global climate change projections. This investigation employed a suite of...
Late Quaternary Evolution of the Northwest Florida Coast and Margin: Development of a Conceptual Model for Identifying and Characterizing Shelf Sediment Deposits
The objective of this investigation was the interpretation of the late Quaternary history of the northwest Florida margin and the development of a conceptual model for understanding the late Quaternary evolution of the regional coast and...
The Appalachian orogen is separated from west to east and into the Cumberland Plateau, Valley and Ridge, Blue Ridge, Inner Piedmont, and Carolina Superterrane physiographic provinces. Within the southern Appalachians of Alabama and...
Mobilization of the radionuclides radon, thorium and radium in groundwater by the alpha-recoil mechanism
Description:
Ion motions, involving atomic collisions within the solid and fluid phases are simulated using a three-dimensional Monte Carlo algorithm, which is based on the principles of ion scattering and electronic interactions with the moving ion.... demonstrate that the recoil effect does occur in a natural sample, and could cause radioactive depletion on the sample surface.
The southeastern Blue Ridge hosts a suite of metamorphic rock units that provide insight to the Neoproterozoic to Paleozoic tectonic influences that impacted the Laurentian continent. The Ashland-Wedowee-Emuckfaw belt of the southernmost...
Oceanic core complexes (OCCs) are the uplifted and rotated footwalls of detachment faults formed at areas of slow spreading on mid-ocean ridges. Detachment faults initiate close to the spreading axis, and because it is easier to continue...
The formation process by which sand becomes cemented with humate compounds to form humicrete is not well understood, likely due in part to limited exposures of this material around the world. Humicrete layers along the Intracoastal...
Until the past decade, IIAB iron meteorites were thought to have formed by fractional crystallization under low pressure, corresponding to an asteroidal sized (<200 km) parent body. Some recent physical models for the formation of early...
The goal of this project is to combine gravity measurements with geologic observations to better understand the "Big Bend" of the San Andreas Fault (SAF) and its role in producing hydrocarbon-bearing structures in the southern Central...
A mercury isotope technique was developed using a Neptune Multi Collector Inductively Coupled Mass Spectrometer (MC-ICPMS) in low resolution mode. The amount of sample used was approximately 10 nanograms of Hg and the external precision...
Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
