Browsing Geology (Theses and Dissertations) by Title
Now showing items 70-89 of 119
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Nitrogen and carbon isotopes in fossil aquatic ecosystems
(Trinity College (Dublin, Ireland). Department of Geology, 2009)In a modem ecosystem, the trophic level of organisms can be distinguished on the basis of their nitrogen and organic carbon isotopic signature (DeNiro & Epstein 1978 and 1981). Due to fractionation during the assimilation ... -
Nitrogen Attenuation along Delivery Pathways in Agricultural Catchments
(Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2018)Anthropogenic application of inorganic and organic nitrogen (N) to agricultural landscapes has pervasive consequences, including human health implications, eutrophication, loss of habitat biodiversity and greenhouse gas ... -
Nitrogen isotopes in the palynomorph Tasmanites, as an indicator of climate change
(Trinity College (Dublin, Ireland). Department of Geology, 2014)The stable nitrogen isotope signature (δ15N) of plants and animals preserved in sedimentary rocks retain a record of past oceanic and atmospheric chemical changes. The majority of modem nitrogen isotope studies focus ... -
Novel geochemical fingerprints of biogenicity applied to ancient carbonates
(Trinity College (Dublin, Ireland). Department of Geology, 2016)The oxygenation of the Earth’s surface shaped our planetary environment, fundamentally altered global biogeochemical cycles, and ultimately paved the way for the rise of complex animals at the beginning of the Cambrian. ... -
Origin and evolution of the Mesoarchean Aouéouat greenstone belt and associated gold mineralisation
(Trinity College (Dublin, Ireland). Department of Geology, 2016)This Aouéouat greenstone belt is situated in the Tasiast-Tijirit Terrane of the Reguibat Shield, part of the West African Craton. Petrographic, geochronological, geochemical and isotopic studies of the Aouéouat greenstone ... -
Oxidative mafic rock weathering through geological time
(Trinity College (Dublin, Ireland). Department of Geology, 2015)Oxidative chemical weathering requires the presence of free oxygen in the Earth's atmosphere. Reconstructing the terrestrial oxidation history in the ancient rock record has helped to detect the intrinsic links between ... -
The Palaeo-Ecology and Geochemistry of Potential Source and Reservoir Microbialites in the Ediacaran-Cambrian Sirab Formation, Sultanate of Oman
(Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2022)Background Rationale & Aim; Ediacaran - Cambrian microbial carbonates are known to range from West Africa to Arabia and Pakistan. In the Sultanate of Oman, these microbialites serve as both source rock and reservoir in the ... -
Palynological correlation of Mississippian (Carboniferous) stages in Western Europe and the USA
(Trinity College (Dublin, Ireland). Department of Geology, 2009)Palynological assemblages from the Late Devonian - Mississippian of Kentucky and the Mississippi Valley have been studied. Productive samples have been obtained from two outcrops situated in northeast Kentucky and eight ... -
Palynostratigraphy and palynofacies analysis of upper Devonian and Mississippian strata of Eastern U.S.A.
(Trinity College (Dublin, Ireland). Department of Geology, 2009)Well preserved and taxonomically diverse miospore assemblages have been recovered from the uppermost Devonian and lower Mississippian strata of the Appalachian Basin, Eastern USA. Rock samples were collected from 13 ... -
Peat bogs as archives of atmospheric metal pollution from natural and anthropogenic sources - A case study from Ireland
(Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2018)This research project combines various geochemical techniques to identify and characterise historic and recent sources of atmospheric metal pollution recorded in ombrotrophic peat bogs across Ireland. In a first subproject, ... -
Pesticide occurrence in Irish groundwater
(Trinity College (Dublin, Ireland). Department of Geology, 2012)Groundwater pesticide occurrence was investigated within agricultural catchments and at the national scale across Ireland. Seven intensive agricultural catchments were selected, each with different physical characteristics ... -
The petrography and geochemistry of pyrite-hosted orogenic gold deposits in the Grampian Terrane of north-west Ireland and Scotland
(Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2020)The Neoproterozoic-Cambrian Dalradian Supergroup of north-west Ireland and central Scotland accommodates vein-hosted gold deposits associated with uplift and deformation during the Ordovician Grampian arc-continent collision ... -
Phosphorus dynamics in some Irish soils : the influence of laboratory drying, soil characteristics and season
(Trinity College (Dublin, Ireland). Department of Geology, 2005)Phosphorus (P) is a nutrient that is important in hmiting biological growth in fresh waters, and desorption of P from soils is thought to be an important driver for the eutrophication of freshwater bodies. Previous studies ... -
Phosphorus exports from agricultural grassland in overland flow and subsurface drainage water
(Trinity College (Dublin, Ireland). Department of Geology, 2003)On the background of increasing phosphorus (P) concentrations in Irish rivers and lakes, this project set out to investigate several aspects of the potential of agricultural grassland to lose P to water. All study sites ... -
Phosphorus in Irish aquifers : implications for input to surface waters
(Trinity College (Dublin, Ireland). Department of Geology, 2002)This project examines phosphorus levels in a range of Irish hydrogeological situations, both to fill this gap in basic scientific knowledge, and to determine the circumstances in which concentrations likely to trigger ... -
Processes of magmatic differentiation within the southern British and Irish Palaeogene Igneous Province
(Trinity College (Dublin, Ireland). Department of Geology, 2009)This thesis presents a geochemical study of magma - crust interaction within the volcanic centres of the southern British and Irish Palaeogene Igneous Province. Three centres occur in northeast Ireland; the Carlingford ... -
Provenance and flux of late quaternary sediment, Southeast Ireland
(Trinity College (Dublin, Ireland). Department of Geology, 2002)The major sediment routing systems of Southeastern Ireland in the vicinity of the Leinster Massif were examined and quantified. Samples were taken from four of the major river systems, the Avoca, Barrow, Liffey and Slaney ... -
Quantitative studies of rock fabrics and textures in layered mafic intrusions of the British tertiary igneous province : implications for magma system emplacement and evolution
(Trinity College (Dublin, Ireland). Department of Geology, 2007)This thesis examines and considers the processes which led to magmatic layering and associated planar and linear fabrics in mafic and ultramafic rocks of four igneous centres of the British (and Irish) Palaeogene Igneous ... -
Rare earth elements in olivine:determination, occurrence and behaviour
(Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2018)Olivine is a widely occurring mineral that offers great potential for improving our understanding of geological processes. Olivine is present across a range of geologically significant settings, occurring in stony-iron ... -
Recognition of abnormal thermal histories of Jurassic source rocks from integrated analyses of vitrinite reflectance and organic matter colour / fluorescence
(Trinity College (Dublin, Ireland). Department of Geology, 2002)By investigating three sedimentary horizons through the aureole of a Tertiary dyke intruding a Middle Jurassic sedimentary section in NE Skye, the thermal response rates of the various organic maturity indicators to ...