Global ETD Search
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Showing 1 to 16 of 16 for “"continental breakup"”.
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Magmatism and dynamics of continental breakup in the presence of a mantle plume
… studies the dynamics of mantle melting during continental breakups by geophysical, geochemical, and numerical analyses. The first part focuses on the mantle melting and crustal accretion processes during the formation of the Southeast Greenland margin, on the basis of deep-crustal seismic data. …
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Magmatism and dynamics of continental breakup in the presence of a mantle plume
… studies the dynamics of mantle melting during continental breakups by geophysical, geochemical, and numerical analyses. The first part focuses on the mantle melting and crustal accretion processes during the formation of the Southeast Greenland margin, on the basis of deep-crustal seismic data. …
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The origin of the assymetry in the Iceland hotspot along the Mid-Atlantic ridge from continental breakup to present-day
… asymmetrically with the Mid-Atlantic ridge since continental breakup, influencing the Reykjanes Ridge over a greater distance to the south than the Aegir and Kolbeinsey Ridges to the north. We investigate causes of this asymmetry with 3D numerical models that simulate a mantle plume interacting …
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Investigating Volcano-Tectonic Interactions in the Natron Rift, East Africa with Implications for Understanding Volcanic Eruptive Processes
An early phase continental rift is an emerging plate boundary where tectonic forces stretch and thin the continental lithosphere, shaping the Earth's surface. Continental breakup and its progression are typically driven by the interplay between repeated magmatic and tectonic activities, which have …
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Tectonics of the West Iberia continental margin from seismic reflection data
Continental rifting is a fundamental component of the plate tectonic cycle. The West Iberia passive margin is a classic example of a nonvolcanic rifted margin. The West Iberia margin contains an enigmatic north-south ridge of serpentinized peridotite located within the ocean-continent transition. …
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The Post Triassic uplift and erosion history of the Southwestern UK
The passive continental margins which surround the North Atlantic region have been subject to widespread post-Triassic exhumation, the timing, magnitude and causes of which are debated. Exhumation of up to 6km (but more generally ≤3km) has been shown to have affected the Western UK Continental …
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A combination of apatite fission track and (U-Th)/He thermochronometers to constrain the escarpment evolution in south eastern Australia: a case study of high elevation passive margins
… and styles of response of the landscape to the continental breakup and sea-floor spreading of the Tasman Sea (85 Ma). The three prevailing models of escarpment evolution namely retreat into a downwarped rift shoulder, escarpment retreat and excavation in place on a high elevation rift shoulder …
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Seismic imaging and thermal modeling of active continental rifting processes in the Salton Trough, Southern California
Continental rifting ultimately creates a deep accommodation space for sediment. When a major river flows into a late-stage rift, thick deltaic sediment can change the thermal regime and alter the mechanisms of extension and continental breakup. The Salton Trough, the northernmost rift segment of …
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Patterns and processes in animal evolution : molecular phylogenetics of Southern Hemisphere fauna : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Genetics
… asteroid impact at the K – Pg boundary, and the continental breakup of Gondwana. It investigates what impact these events had on species diversification by studying the phylogenetic relationships of two groups of taxa – the family Anostostomatidae (insects), and Neoaves (birds). Anostostomatidae …
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A comparison of melt depletion, thermal structure and metasomatism of proterozoic mantle lithosphere in the Namaqua-Natal and Rehoboth Provinces of Southern Africa
… processes (e.g., kimberlite and other magmatism, continental breakup) that have affected it. Mineral thermobarometry from a variety of independent thermobarometers indicates that, at pressures less than about 4 GPa, xenoliths from the Rehoboth Province (Louwrensia and Rietfontein) lie on or very …
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Crustal structure of rifted and convergent margins : the U.S. East Coast and Aleutian margins
… most important processes that create and modify continental crust occur at continental margins, but recently has the scientific community acquired the necessary intrumentation to image crustal structure across margins in detail. In this thesis we investigate the crustal structure across the U.S. …
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The architecture, growth and tectono-stratigraphic significance of rift-oblique lineaments on the NE Atlantic Margin
… a series of rift events culminating with continental breakup in the Early Cenozoic. From potential field, seismic reflection, seismic refraction and ocean bottom seismometer datasets, a series of rift-oblique lineaments (loosely referred to as ‘transfer zones’) have been identified which …
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Dynamics of mantle plumes
… to mass extinction events (Wignall, 2001) and continental breakup (White and McKenzie, 1989). Thus, mantle plumes have been the subject of many previous numerical modelling studies (e.g. Farnetani and Richards, 1995; d’Acremont et al., 2003; Lin and van Keken, 2005; Sobolev et al., 2011; …
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Heterogeneous Strain Distribution & the Effects of High Frequency Climate Change on the Evolution of Early-Stage Rift Systems: Case Studies from Lakes Tanganyika and Malawi (Nyasa), East Africa
… of the earth’s crust through the formation of continental rift basins is a fundamental aspect of plate-tectonics and the first step that ultimately leads to plate-spreading, new continent formation, and the creation of ocean basins. Within continental rifts, processes associated with …
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Detektion eines mesozoischen Gangschwarmes in NW Namibia und Rekonstruktion regionaler Spannungszustände während der Südatlantiköffnung
Gangschwärme nehmen eine bedeutende Stellung im Verständnis zur kontinentalen Fragmentierung ein. Einerseits markieren sie das Paläo-Spannungsfeld und helfen bei der Rekonstruktion der strukturellen Entwicklung der gedehnten Lithosphäre, andererseits gibt ihre petrologische Beschaffenheit Aufschluß …
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CENOZOIC EXTENSION OF THE LAKE TANGANYIKA RIFT, EAST AFRICA: STRUCTURES, TECTONOSTRATIGRAPHY AND PALEOENVIRONMENTAL RECONSTRUCTION
<p>Active continental rifts are ideal sites for understanding the break-up of continents, and long-lived rift lake environments are known as important reservoirs for endemic communities and biodiversity. The sedimentary fill of extensional continental rifts within the East Africa Rift System (EARS) …