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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.
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...
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...
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...
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....
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...
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...
Atmospheric Mercury Wet Deposition along the Northern Gulf of Mexico: Seasonal and Storm-Type Drivers of Deposition Patterns and Contributions from Local and Regional Emissions
Continuous event-based rainfall samples were collected at three sites throughout the Pensacola airshed from 2005 - 2011. Samples were analyzed for total mercury (Hg), a suite of trace metals (TMs), and major ions in order to understand...
Panamá arc activity has been divided into three episodes, the Late Cretaceous to Eocene episode, the Miocene episode, and the Pliocene to recent adakite suite. Rocks from the oldest episode are dominantly hornblende bearing, contain a...
The Greenland Ice Sheet (GrIS) is melting at an alarming rate. Supraglacial melt water flows into moulins that drain to the base of the ice sheet, and enhances basal flow. Ultimately, large quantities of melt water are expelled into the...
This thesis is focused on two aspects: one is to obtain high precision measurement of rhenium isotope composition of iron meteorites; the other is to discuss what processes cause systematic isotopic differences in Re between IVB irons...
The aeolian transport of aerosols (mineral dust from desert areas, smoke and ash from biomass burning, and from anthropogenic emissions) is an important process for introducing bioactive trace elements to the surface ocean and can have a...
Accurate and Precise Determination of Low Concentration Iron, Arsenic, Selenium, Cadmium, and Other Trace Elements in Natural Samples by Octopole Collision/Reaction Cell (CRC) Equipped Quadrupole-ICP-Ms
An improved method for accurate and precise determination of trace quantity dissolved metals and metalloids in natural samples by Octopole Collision/Reaction Cell (CRC) equipped Quadrupole-Inductively Coupled Plasma-Mass Spectrometry ...
In the southernmost Appalachians, bimodal volcanics of Pumpkinvine Creek Formation (PCF) and its proposed equivalent, the Hillabee Greenstone (HG) have indistinguishable ages (~460 Ma) and trace element-REE pattern similar to an arc/back...
El Valle is the easternmost volcano in the Central American Volcanic Arc, and is characterized by two periods of volcanic activity, an Old Group from 10-5 Ma and a Young Group from 3-0.03 Ma. Both the Old and Young Group’s are calc...
Stalagmites, or speleothems, are secondary cave deposits that record the isotope and trace element composition of the parent dripwaters within their crystal matrix. Changes in dripwater oxygen and carbon isotopes (δ18O and δ13C) and...
The chemical compositions of basaltic melts from diverse tectonic settings on Earth are interpreted in terms of mantle sources that are either a single lithology (peridotite) or composed of two mixed lithologies (peridotite + pyroxenite)...
Chondrules are silicate spherules in chondritic meteorites thought to have formed as free-floating melt droplets created by a transient heat source in the early solar system. Due to their ubiquity in asteroids, determining the origin of...
The Talladega-Cartersville fault emplaces the rocks of the Talladega metamorphic belt upon the unmetamorphosed rocks of the foreland fold-and-thrust belt. The Talladega slate belt is composed of lower-greenschist facies meta-sedimentary...
Geology of the Epperson Synclinorium, Georgia and Tennessee, Correlating Middle Paleozoic Successor Basin Sequences and Implications for the Depositional and Tectonometamorphic Evolution of the Southern Appalachian Western Blue Ridge
The Epperson synclinorium contains a key sequence of middle Paleozoic stratigraphy nested within the main mass of the western Blue Ridge-Talladega belt allochthon. For many decades, previous interpretations have assigned these rocks to...
The Phanerozoic is typically known as an interval in which complex life has developed and thrived. However, there are multiple instances throughout this era in which climatic shifts and extinctions have made it difficult for the...
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.
