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Articles 1 - 8 of 8
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Zeolite Facies And Environmental Change In The Plio-Pleistocene Baringo Basin, Kenya Rift, Karim Minkara
Zeolite Facies And Environmental Change In The Plio-Pleistocene Baringo Basin, Kenya Rift, Karim Minkara
Geosciences Theses
Sediments exposed in the Tugen Hills in the Central Rift of Kenya include an important hominin-bearing succession of volcaniclastic and fluvio-lacustrine deposits. The Hominin Sites and Paleolakes Drilling Project (HSPDP) retrieved a ~230 m core through a portion of the Chemeron Formation, containing a highly resolved succession of strata spanning events leading to the Plio-Pleistocene boundary (3.4-2.6 Ma). Trends in the character and abundance of zeolites indicate changes in paleoenvironmental conditions with varying stability identified through distinct facies assemblages. These seem to reflect high amplitude changes accompanying peak earth-orbital eccentricity at ~2.7 Ma, and relative stability at low eccentricity at …
Assessing The Impact Of Hurricane Katrina On The Coastal Wetland Of St. Bernard, Louisiana, Rukumani Rimal
Assessing The Impact Of Hurricane Katrina On The Coastal Wetland Of St. Bernard, Louisiana, Rukumani Rimal
Geosciences Theses
The wetlands of the coastal Louisiana have been disappearing at an alarming rate. The rate was further accelerated during the Hurricane Katrina. Hurricane Katrina converted a large area of wetland into open water by bulk removal of vegetation, flooding, and killing of plants through the salt water inundation. The aim of this study was to quantify wetland loss rates in a high salinity wetland of St. Bernard Parish, Louisiana before and after Hurricane Katrina made landfall. Change-detection-mapping and analysis, using Landsat TM images, was used for generating the change matrices. Images from 1990 and 2010 were analyzed to estimate total …
Investigating The Effect Of Aging And Time On The Fate And Transport Of Lead In Artificially Contaminated Tropical Soils., Fatai Balogun
Investigating The Effect Of Aging And Time On The Fate And Transport Of Lead In Artificially Contaminated Tropical Soils., Fatai Balogun
Geosciences Theses
Incubation and Batch desorption experiments were conducted on ultisol and a mollisol to assess the effect of aging temperature and contact time on Pb sorption in soils A and B horizon ultisol and Mollisol from Humboldt and San Luis Obispo County, California were incubated at room temperature, 50 and 70 ⁰C for 3 hours, 4 weeks and 2 months in the laboratory. After each aging period, samples were extracted with 10-4 M H2SO4 solution, equilibrated for 24 hours, centrifuged and filtered through a 0.45 µm filter. A separate subsample of the B-Horizon supernatant was passed through …
Geochemical Signatures Of Stream Capture In The Retreating Blue Ridge Escarpment, Southern Appalachian Mountains, David Dubose
Geochemical Signatures Of Stream Capture In The Retreating Blue Ridge Escarpment, Southern Appalachian Mountains, David Dubose
Geosciences Theses
Stream capture is a major driver of the retreat of the Blue Ridge Escarpment, but timescales of capture are not well understood. This study examines stream sediment geochemistry to establish a set of sediment source fingerprints which can be used to identify and date the capture of the Tallulah River. Statistical analyses show significant differences in U, Th, and certain REE enrichment. These differences result from variations in bedrock along the lengths of each river and a shift in relative stream powers after capture to favor mobilization or deposition of heavy elements. The observed differences should be sufficient to identify …
Comagmatic Evolution Of The Boulder And Pioneer Batholiths Of Southwest Montana, John Bankhead
Comagmatic Evolution Of The Boulder And Pioneer Batholiths Of Southwest Montana, John Bankhead
Geosciences Theses
The tectonic region that encompasses Southwestern Montana is a petrologically complex area containing several batholiths and thrust faults, underlined by Precambrian basement rock and capped by sedimentary rocks. Intrusive volcanism of Southwest Montana best represented by the Pioneer and Boulder batholiths is a product of the eastward subduction of the Farallon Plate underneath the North American Plate during the Mesozoic time. Geochemical modeling made evident that the Pioneer and Boulder batholiths have a comagmatic relationship. This conclusion is derived from variation, spider and REE diagrams along with petrographic and geochemical models. The intrusion of these batholiths is likely related to …
A Geospatial Analysis: Impacts Of Hurricane Matthew, St. Catherines Island, Georgia, Steven Dobson
A Geospatial Analysis: Impacts Of Hurricane Matthew, St. Catherines Island, Georgia, Steven Dobson
Geosciences Theses
The purposes of this study were to evaluate the shoreline dynamics and environmental change of St. Catherines Island shoreline through the application of an updated shoreline model (1859-2017). Efforts were completed to document and quantify the impacts to the nearshore environments of the island from Hurricane Matthew (07-08 October 2016). This was accomplished through the measurement of Net Shoreline Movement (NSM) that was performed along the shoreface at 200-meter spacings by using aerial imagery and ground-collected GPS data. The Hurricane Matthew NSM data along with the short-term shoreline rates were used to calculate the years of change along the shoreline …
An Analysis Of The Community Land Trust Model, Tara A. Franklin-Mitchell
An Analysis Of The Community Land Trust Model, Tara A. Franklin-Mitchell
Geosciences Theses
Lefebvre’s ‘right to the city’ concept involves collective ownership of the means of production, rights to information, right to difference, right to self-management, and what he refers to as ‘autogestion.’ Lefebvre’s ideas have captured the imagination of many grassroots and transnational organizations, such as the Right to the City Alliance and have been applied to various issues in the city dealing with human rights, including access to affordable housing, use of public space, and threats of displacement from gentrification. Within and across these organizations, it becomes critical to examine the contours of ‘the right to the city’ and what rights …
Land Cover Change Impacts On Multidecadal Streamflow In Metropolitan Atlanta Ga, Usa, T. Chee Hill
Land Cover Change Impacts On Multidecadal Streamflow In Metropolitan Atlanta Ga, Usa, T. Chee Hill
Geosciences Theses
Urbanization has been associated with the degradation of streams, and a consequence of forest to urban land transition is a change in streamflow. Therefore, the purpose of this thesis is to examine the impacts of land-cover change in ten different watersheds in the rapidly urbanizing Atlanta, GA USA metropolitan area. Streamflow and precipitation data for a 30-year period (1986-2016) were analyzed in conjunction with land cover data from 1992, 2001, and 2011. Big Creek and Suwanee Creek experienced the most urbanization and increases (20%) in streamflow and runoff, and high flow (>95th percentile of flow) days doubled and increased …