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 20 of 97 for “"Neogene"”.
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Volcanological studies of Neogene flood basalt groups in eastern Iceland
Flood basalt groups in the Neogene lava piles of eastern Iceland are subject to investigation. The groups form the stratigraphic section above the Reyðarfjörður central volcano up to the Thingmuli central volcano, mapped by the British geologist G. P. L. Walker and his students in the 1950s and …
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Neogene to quaternary foraminifera from the western margin of southern Africa
… of the Benguela Upwelling System during the Neogene. Microfossils in marine sediments provide key proxies in our understanding of how the margin evolved. Fossil shells (tests) of foraminifera (singlecelled protists) from twenty cores from the Namibian shelf (199 to 309 m water depth) and …
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Triassic to Neogene Evolution of the Andean Retroarc: Neuquén Basin, Argentina
… Strata ranging in age from Middle Jurassic to Neogene were analyzed to determine their detrital zircon U-Pb age spectra and Hf isotopic composition to determine the relationship between magmatic output rate, tectonic regime, and crustal evolution. When all detrital zircon data are combined, …
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Aspects of Neogene palaeoceanography in the southern Tasman Sea (DSDP site 593)
Aspects of the Neogene palaeoceanographic history of the southern Tasman Sea are described in this thesis from DSDP Site 593 records of oxygen and carbon isotopes, and sediment texture and compositional data. Site 593 occurs in 1068 m water depth on the western flanks of the Challenger Plateau, …
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Evaluating the Controls of Neogene Exhumation in the Tropical Northern Andes (colombia)
… of the Northern Andes has responded to Neogene variations in slab geometry, climate, and drainage reorganization. I also discuss how the Neogene topographic changes may be one of the drivers that make the tropical Northern Andes of Colombia one the world's most biodiverse places on …
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Neogene paleomagnetism and geodynamics of the Hikurangi margin, East Coast, New Zealand
… rotations are an important component of Neogene deformation in the New Zealand plate boundary region, and potentially offer fundamental insights into the rheology of continental crust. Extensive paleomagnetic sampling along the Hikurangi margin, on the East Coast of the North Island, has …
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Die neogene Hebungsgeschichte der Patagonischen Anden im Kontext der Subduktion eines aktiven Spreizungszentrums
Das Phänomen der Subduktion eines aktiven Spreizungszentrums an der Südspitze Südamerikas ist seit langem bekannt. Eine Vielzahl von geologischen Beobachtungen wurden mit diesem Phänomen in Verbindung gebracht, trotzdem ist der genaue Mechanismus der Beeinflussung des aktiven Kontinentalrandes …
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Plants as biotic indicators of Neogene palaeoenvironmental evolution in the Cape Floristic Region
Comparative biologists have refined the synthesis of molecularly dated phylogenies and ecological data into an important tool to reconstruct the evolution of species and biomes, and to unravel the history and role of abiotic determinants of diversity patterns (fire, climate, tectonism). This has …
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Quantitative Studies of Late Neogene Coastal Environments Using Bivalve Subfossil and Fossil Assemblages
Coastal environments are important in many ways: they provide food and energy for coastal communities, have a variety of unique biologic habitats, and influence global climate. These environments can change due to either anthropogenic or natural phenomena over a wide range of time scales. However, …
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It’s clam-plicated: how functional traits influenced extinction patterns of Neogene West Atlantic mollusks
Because mollusks are not only indispensable members of marine ecosystems, but are also essential human food sources throughout much of the world, their patterns of survival under future anthropogenic climate change conditions must be predicted in order to focus conservation efforts. Bivalves and …
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Sequence stratigraphic, paleoenvironmental, and chronological analysis of the late neogene Wanganui River section, Wanganui basin
Between Taranaki Basin and the central ranges of the North Island, New Zealand, lies the broadly elliptical, back-arc Wanganui Basin, half of which is onshore. This basin covers an area of about 22,000 km², and contains a Plio-Pleistocene sedimentary succession some 4 km thick. Ongoing south- to …
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<em>Vitis</em> Seeds (Vitaceae) from the Late Neogene Gray Fossil Site, Northeastern Tennessee, USA.
… American flora continued to as late as late Neogene.</p>
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Late Proterozoic bedrock geology and its influence on neogene littoral marine diamondiferous trapsites, MA1-Sperrgebiet, Namibia
Namibia's south western coast, the Sperrgebiet, hosts one of the world's largest diamond placer deposits. Diamond distribution in this placer deposit is directly related to the presence of a diamond-carrying gravel, the degree of reworking of the gravel and the quantity and quality of the diamond …
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Analysis of the central Hawke's Bay sector of the Late Neogene forearc basin, Hikurangi margin, New Zealand
… nomenclature is proposed for the Neogene succession, particularly for the latest Miocene-Early Pleistocene part (Mangaheia Group). The Tolaga Group is extended into central Hawke's Bay from the north, and incorporates the Early Miocene-Early Pliocene succession. It is proposed that …
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Neogene seismotectonics of the south-central Chile margin : subduction-related processes over various temporal and spatial scales
… efforts. This study focuses on tectonics at the Neogene and late Quaternary time scales in the Main Cordillera and coastal forearc of the south-central Andes. For both domains I document the existence of previously unrecognized active faults and present estimates of deformation rates and fault …
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Paleogene-Early Neogene palynomorphs from the Eastern Equatorial Atlantic and Southeastern Florida, USA: Biostratigraphy and paleoenvironmental implications
<p>"The transition from greenhouse conditions (Paleocene-Eocene Thermal Maximum, PETM) to icehouse conditions (Early Oligocene) is not well documented in tropical-subtropical regions. One hundred and five samples from Ocean Drilling Program (ODP) Site 959 (Hole 959A and Hole 959D) in the Cote …
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