Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"oceanic island"”.
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Global isotopic signatures of oceanic island basalts
… isotopic analyses of 477 samples representing 30 islands or island groups, 3 seamounts or seamount chains, 2 oceanic ridges and 1 oceanic plateau [for a total of 36 geographic features] are compiled to form a comprehensive oceanic island basalt [OIB] data set. These samples are supplemented by 90 …
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Global isotopic signatures of oceanic island basalts / by
… isotopic analyses of 477 samples representing 30 islands or island groups, 3 seamounts or seamount chains, 2 oceanic ridges and 1 oceanic plateau [for a total of 36 geographic features] are compiled to form a comprehensive oceanic island basalt [OIB] data set. These samples are supplemented by 90 …
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Pluton source varition over two magmatic pulses in the White-Inyo range, central-eastern California : implications for paleozoic and mesozoic tectonic reconstructions
… plutons: an underplated, eclogitized oceanic island arc. Chapter 4 is a regional study of the WIR, and it includes whole rock major and trace element and isotopic data to interpret the three distinct sources of plutons: (1) the eclogitized oceanic island arc, (2) enriched lithospheric …
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Evaluating mantle and crustal processes using isotope geochemistry
… mantle lithosphere, examines melt inclusion from oceanic island basalts to evaluate the scale of the mantle heterogeneities, and uses U-series isotope to constrain geodynamic parameters, such as the upwelling velocities and porosities of mantle plumes. The lower continental crust plays a pivotal …
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Aspectos da biologia reprodutiva de Pterodroma arminjoniana (Giglioli & Salvadori,1869) (Aves: Procellariidae) na ilha da Trindade, Atlântico Sul
… the genus to breed in Brazil, was studied at the oceanic island of Trindade, South Atlantic (20º 30' S, 29º 19' W), between 1988 and 1993. According to the results obtained after 1270 hours of observations, the breeding habits of P. arminjoniana closely resembles those of other species of …
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Colonisation and diversification in invertebrates: looking within species on islands to connect pattern and process
… is a key element to understand them. Using two island scenarios and applying molecular tools, this thesis looks within species to investigate the themes of colonisation (both island colonisation and European continental recolonisation) and diversification processes in invertebrates. The aim was …
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Geochemical and fluid dynamic investigations into the nature of chemical heterogeneity in the Earth's mantle
… isotope geochemistry of mantle peridotites and oceanic island basalts, and by studying aspects of the flow of viscous fluids driven by thermal buoyancy. The trace element and isotopic systematics of peridotites and associated mafic layers from the Ronda Ultramafic Complex, southern Spain …
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Petroleum effects on soil microbial communities
… oil addition. We used soils from the Trindade Island and from the Highfield research station at Rothamsted Research, UK. We assembled microcosms of 20 grams and contaminated the soils using weathered crude oil. Soils were incubated at 26° C with moisture correction to ca. 60% water holding …
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Phylogenies of the sunbirds, spiderhunters and flowerpeckers (Nectariniidae) based on analyses of vocalisations
… on the Indian subcontinent, reached Indian Ocean islands including Madagascar and then penetrated into Africa, with the possibility that some oceanic island species were later derived from secondary invasions from Africa. The results further suggest that the clade of the Gulf of Guinea group of …
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AVOIDING COLLAPSE: RESILIENCE AND SUSTAINABLE DEVELOPMENT IN VULNERABLE SMALL ISLANDS
Small islands dependent on reef fisheries, farming and tourism are vulnerable to rising human and natural pressures and may target "sustainable" development. Marine Protected Areas (MPA) have a proven ability to meet ecological goals, such as restoring fisheries and preserving ecosystem function …
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Helium isotope geochemistry of oceanic volcanic rocks : implications for mantle heterogeneity and degassing
… have been measured in a number of mantle derived oceanic basalts. The goal of this research is to use the helium isotopic systematics to constrain the nature and origin of mantle heterogeneity in the oceanic mantle. Studies of helium partitioning in mid-ocean ridge basalt (MORB) glass, performed …
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Assessing the effects of anticoagulant rodenticides on non-target fish species
… Invasive rat species have negatively affected island ecosystems contributing to the decline and extinction of many endemic species. The eradication of rodents on islands can leads to restoration of native ecosystems. Anticoagulant rodenticides (ARs) have been an effective tool for rat …
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Evaluating mantle and crustal processes using isotope geochemistry
… mantle lithosphere, examines melt inclusion from oceanic island basalts to evaluate the scale of the mantle heterogeneities, and uses U-series isotope to constrain geodynamic parameters, such as the upwelling velocities and porosities of mantle plumes. The lower continental crust plays a pivotal …
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The petrogenesis and geochemistry of the Namaqualand olivine melilitite pipe cluster, western South Africa
… isotope values approaching those of HIMU oceanic island basalts (e.g., from St. Helena, Mangaia, Tubuai), whereas the Bushmanland and Warmbad clusters display isotopic compositions that only extend to weaker HIMU signatures. The geochemical and age-distance patterns displayed by the NBW …
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Island Biodiversity and Human Palaeoecology in the Philippines: A zooarchaeological study of Late Quaternary faunas
… archaeofaunal material from Luzon and Palawan Islands, the study presents important fossil discoveries and palaeoecological insights into the dynamics of faunal change in the Philippines. The faunal analyses also allow the first attempt to construct Late Quaternary biostratigraphic sequences …