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Showing 1 to 15 of 15 for “"palaeomagnetism"”.
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Palaeozoic Palaeomagnetism of South-Eastern Australia
The drift history of Gondwana following the break-up of Rodinia (or perhaps Pannotia) to the amalgamation into Pangaea has great implications in many disciplines in Earth sciences, but remains largely unknown. Among the apparent polar wander (APW) paths published for Gondwana in the last few …
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Pollen analysis, chronology and palaeomagnetism of three Late Weichselian sites in southern Sweden
… were studied with respect to pollen analysis and palaeomagnetism. The chronologies are based on pollen stratigraphical correlations, radiocarbon dating and, for two of the sites, on a clay-varve chronology. The stratigraphies were correlated to the GRIP event stratigraphy and their ages are …
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Novel Insights into the Palaeomagnetism of Serpentinized Peridotites from the Troodos and Oman Ophiolites
… field at the time of its formation, allowing palaeomagnetism to be used as a tool to investigate this process. <br/><br/>Many ophiolites also experienced large-scale tectonic rotations during their evolution. In some cases, the timing of these rotations is well-documented palaeomagnetically, …
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Palaeozoic and Mesozoic Palaeomagnetism of South America: Results from Peru, Bolivia, Argentina, and Brazil.
Im Rahmen der vorliegenden Arbeit, wurden in verschiedenen Regionen Südamerikas detaillierte paläomagnetische Untersuchungen durchgeführt. Ziel dieser Arbeiten war die Erstellung einer hochauflösenden scheinbaren Polwanderkurve für Gondwana im Paläozoikum und eine Beschreibung der …
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The origin of recumbent fold nappes: The Lochalsh fold as the main example
… of conglomerate pebbles, magnetic anisotropy and palaeomagnetism strain patterns have been obtained for these nappes. Different rock types control the style of folding, and, in part, the sequence of structures developed. The development of. each recumbent fold is a multistage process and prior to …
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Palaeomagnetic studies on some South African rocks
A brief review of the subject of palaeomagnetism as it affects the study of the behaviour of the earth's magnetic field and the problems of Continental Drift and Polar wander is presented, giving the reasons why a systematic palaeomagnetic study of the Cape and Karroo Systems of South Africa would …
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Seismic anisotropy in siliciclastic reservoir rocks
… analysis, ultrasonic velocity measurements, palaeomagnetism, anisotropic magnetic susceptibility, and numerical modelling are combined to elucidate the controls of the elastic anisotropy of siliciclastic sedimentary rocks from an oil reservoir. SEM-EBSD was used to measure both the overall …
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The Sheeted Dyke-Gabbro Transition Zone: the Key to Unravelling the Palaeomagnetic Record of the Oman Ophiolite
The Oman ophiolite is a natural laboratory for the study of processes operating above a nascent subduction zone. It formed in the Late Cretaceous by supra-subduction zone spreading and shortly afterwards was emplaced onto the Arabian continental margin. Twelve massifs in the ophiolite expose …
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Assessing Holocene and late Pleistocene geomagnetic dipole field variability
Palaeomagnetic studies of continuous geological archives and archaeological artefacts are required to reconstruct geomagnetic field changes beyond the range of historical observations. In this thesis I assess the reliability of sedimentary palaeomagnetic data and Holocene dipole field …
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An appraisal of a new method for the full-vector reconstruction of the Earth’s magnetic field - applied to volcanic rocks from Mexico
Das Magnetfeld der Erde wird durch Konvektionsströmungen im elektrisch leitfähigen, flüssigen eisenreichen äußeren Erdkern erzeugt. Eine drastische Ausprägung der dynamischen Prozesse im äußeren Erdkern sind sowohl Polaritätswechsel über geologische Zeiträume, als auch geomagnetische …
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Investigations of temporal changes in climate and the geomagnetic field via high-resolution radiocarbon dating
Geological archives have shown periods of abrupt climate change in the relatively stable Holocene epoch (last ca. 11 700 years). One of these periods was around 2800 cal BP. Several records, mainly from Europe, reveal a shift towards wetter, cooler and windier conditions. There are, however, …