Geology (Theses and Dissertations): Recent submissions
Now showing items 61-80 of 130
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Ammonoid biostratigraphy of the Shannon Basin, western Ireland
(Trinity College (Dublin, Ireland). Department of Geology, 2016)This study concerns ammonoid faunas from a classic turbidite succession, the Ross Sandstone Formation [Serpukhovian-Bashkirian) of the Shannon Basin, western Ireland. In addition to coastal exposures, a set of 12 behind-outcrop ... -
Characterising dispersed metal plumes in surficial soils and sediments in the Irish Midlands: Using isotope fingerprints to develop vectors in mineral exploration
(Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2018)The enhancement of mineral exploration is essential for the growing demand of base metals in the world. Successful geochemical surveys in soil and till have led to numerous discoveries. However, most of these deposits are ... -
Very large bolide impacts:insight from melt products and element behaviour in the crater fill
(Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2018)Large (>100 km) impact events have shaped the surfaces of terrestrial bodies in the inner Solar System. They have fundamentally altered the Earth?s geochemistry and may even have contributed to making the Earth habitable. ... -
The Halogen Composition of the Proto-Iceland Plume Source Mantle
(Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2018)The study of halogens in mantle-derived melts is allowing for new and unique insights into mantle geodynamics (e.g. Kendrick et al., 2017). The current dataset of mantle halogens record the compositions of both the depleted ... -
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 ... -
Insight into the origins of metasomatism along the southern margin of the North Atlantic Craton, South Greenland
(Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2018)The cratonic sub-continental lithospheric mantle (C-SCLM) has been isolated from mantle convection since it stabilised more than 2.5 billion years ago. Volatiles introduced into the C-SCLM drive metasomatism, ultramafic ... -
An Integrated Multi-Isotope and Element Distribution Study of the Irish Biosphere
(Trinity College Dublin. School of Natural Sciences. Discipline of Geology, 2017)Geochemical variation in major and trace element concentrations and multiple isotope systems (87Sr/86Sr, δ18O, δ2H, δ13C, δ15N) are explored within the Irish biosphere. This is done through the analysis of an array of ... -
The structure and dynamics of the lithosphere beneath Tibet from seismic surface-wave analysis
(Trinity College (Dublin, Ireland). Department of Geology, 2013)Despite the numerous studies undertaken to investigate the underlying structures beneath the Tibetan Plateau, fundamental questions about the mechanism of lithospheric convergence between India and Asia (establishing if ... -
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 ... -
Thermal modelling of planetesimals heated by 26 A1 : implications for chondrule formation
(Trinity College (Dublin, Ireland). Department of Geology, 2002)Chondrules are enigmatic components of chondritic meteorites. After decades of research a consensus as to how chondrules formed has not been found. In general it has been assumed that chondrules formed in the solar nebula ... -
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 ... -
The genesis of exceptionally thick shallow marine sequences exposed within the South Munster Basin of southern Ireland
(Trinity College (Dublin, Ireland). Department of Geology, 2002)The South Munster Basin (southern Ireland) is an E-W trending fossil rift system that was active during the Late Devonian and Early Carboniferous. Subsidence during this period was rapid and led, despite a high sediment ... -
Evaluation of measures to reduce nitrate loss to groundwater from tillage land
(Trinity College (Dublin, Ireland). Department of Geology, 2011)Note: The author is preparing an academic paper using material from this thesis, therefore some sections and figures have been deliberately omitted. -
Magmatic differentiation and bimodality in oceanic island settings - implications for the petrogenesis of magma in Tenerife, Spain
(Trinity College (Dublin, Ireland). Department of Geology, 2010)The Tenerife post-Icod-collapse succession, comprised of the Teide-Pico Viejo central complex and its adjacent rift zones, marks the latest eruptive cycle on Tenerife (200-0 ka) that broadly evolved from primitive lavas ... -
Geochemical signature of rift relocations at Iceland
(Trinity College (Dublin, Ireland). Department of Geology, 2010)Iceland is located at the intersection between the Mid-Atlantic Ridge and a mantle plume. Three active rift segments at Iceland represent the onshore expression of the Mid-Atlantic Ridge. Iceland’s tectonic evolution has ... -
Acoustic imaging of variable water layer structure in Rockall Trough, NE Atlantic
(Trinity College (Dublin, Ireland). Department of Geology, 2012)A new application of an old technique to study the Earth’s interior is allowing us to see stratification in the ocean, providing a new insight into oceanic structure and mixing processes. The new adaptation of seismic ... -
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 ... -
A multi-radioisotope approach to dating sedimentation : applying Re-Os organic-rich shale and U-Pb authigenic xenotime dating to the Shannon and Pennine Basins
(Trinity College (Dublin, Ireland). Department of Geology, 2013)Sedimentary rocks are the most abundant hthologies on the Earth, covering over 70% of the planet’s surface. Quantitative dating of sedimentary rocks (especially those devoid of fossils) is critical to understanding the ... -
Dynamic topography of Central and Southern Africa
(Trinity College (Dublin, Ireland). Department of Geology, 2009)Africa’s basin and swell topography is thought to be dynamically supported by mantle convection because it correlates closely with long wavelength free-air gravity anomalies, which can be regarded as a proxy for the ... -
The structural evolution and giant landslides of La Palma, Canary Islands
(Trinity College (Dublin, Ireland). Department of Geology, 2005)The island of La Palma, in the western Canary Archipelago, is formed by a partially dismantled and eroded Plio-Pleistocene strato-shield volcano (Taburiente/Cumbre Nueva) that is overlapped and elongated to the south by ...
