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.
Results
Showing 1 to 20 of 44 for “"Palaeozoic"”.
-
Palaeozoic Palaeomagnetism of South-Eastern Australia
… up to thousands of kilometres). The mid Palaeozoic segment of the APW path is particularly problematic, and two primary schools of thought arise. Some authors favour a Silurian – Devonian loop in their APW path passing through southern South America (on a reconstruction of Gondwana), …
-
Palaeobiology of Palaeozoic medusiform stem group echinoderms.
… both external and internal anatomy of a group of Palaeozoic fossil medusiform animals are described with the aid of text-figures and plates with explanatory drawings. This fossil group had a worldwide distribution with a stratigraphic range from the Lower Cambrian to the Upper Devonian and …
-
Metallogenesis of Cu deposits in Upper Palaeozoic sedimentary rocks, southern Ireland
… be associated with the development of the Upper Palaeozoic Munster and South Munster Basins. Detailed geological mapping, including drone mapping and 3D modelling of selected mine sites in SW Ireland have led to a new interpretation of the chronological development of quartz veins hosting copper …
-
Causes and Mechanisms of Remagnetisation in Palaeozoic Sedimentary Rocks - a Multidisciplinary Approach
… to study remagnetised sedimentary rocks from Palaeozoic outcrops in Middle and Eastern Europe. Three areas were selected (NE Rhenish Massif, Barrandian and Holy Cross Mountains), where the causes of Late Palaeozoic remagnetisations are yet unclear. The results yield important implications for …
-
Integrated numerical modelling of a polyhistory basin, Southern Cantabrian Basin (Palaeozoic, NW-Spain)
In order to model highly deformed sedimentary basins, structural balancing must be carried out prior to 2D reverse basin and 2D stratigraphic forward modelling. This study investigates the Southern Cantabrian Basin, which is the Variscan foreland fold-and-thrust belt of NW Spain. Structural …
-
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 …
-
Late Paleozoic basin analysis of the Loppa High and Finnmark Platform in the Norwegian Barents Sea : integration of seismic attributes and seismic sequence stratigraphy
The subsurface upper Palaeozoic sedimentary successions of the Loppa High half-graben and the Finnmark platform in the Norwegian Barents Sea (southwest Barents Sea) were investigated using 2D/3D seismic datasets combined with well and core data. These sedimentary successions represent a case of …
-
Sedimentology of the Mid-Visean limestones of the southern part of the Askrigg Block, North Yorkshire
… resting with profound unconformity on Lower Palaeozoic rocks, have been mapped across their entire outcrop area on the Askrigg Block. The sediments, comprising approximately half of the thickness of the Dinantian Great Scar Group, have been subdivided into four formations listed in ascending …
-
Neoproterozoic to Holocene tectonothermal evolution of the southern Cantabrian Mountains NW Iberia, revealed by apatite fission-track thermochronology
… gathered. The Cantabrian Zone, a nearly complete Palaeozoic succession has been characterised as the thin-skinned tectonism dominated arcuate foreland fold-and-thrust belt. South of the León Line fault system non-metamorphic conditions dominate, to the North anchizone to epizone conditions are …
-
The structural geology of the Naukluft Nappe Complex and its relationship to the Damara Orogenic Belt, South West Africa/Namibia
… geodynamics of the Late Precambrian-Early Palaeozoic Damara orogeny, particularly the hypothesis that it involved plate tectonic processes of subduction and continental collision in the southern zones.
-
Subsurface Precambrian of Saskatchewan
… rocks of Saskatchewan which occur beneath the Palaeozoic and later rocks consist of predominantly northtrending belts ot granitic and metamorphic rocks. The rock assemblage found in the covered Precambrian Shield appears to be similar to that mapped on the exposed Shield, consisting of belts of …
-
Large-scale hydrothermal dolomitisation in the southwestern Cantabrian Zone (NW Spain) : causes and controls of the process and origin of the dolomitising fluids
… is made up of a Precambrian basement covered by Palaeozoic sediments. This succession was thrusted and folded in Late Carboniferous time during the Variscan Orogeny, resulting in several thin-skinned thrust units. The rocks underwent deformation, diagenetic to epizonal thermal events, and several …
-
BIOMINERALIZATION AND GLOBAL CHANGE: BIOTIC RESPONSE TO THE GONDWANAN GLACIATION AND SUBSEQUENT CLIMATE WARMING
The late Palaeozoic, a time-interval of roughly 100 million years comprising the Carboniferous and the Permian, has been the theatre of dramatic climate changes. Starting from greenhouse climatic conditions, this time-interval witnessed the transition to icehouse conditions in the late Visean, with …
-
Thermochronology of ‘The Gap’, Western Australia
… areas of sedimentary cover sequences from the Palaeozoic−Mesozoic Canning Basin and the Neoproterozoic−Palaeozoic Officer and Amadeus Basins. Basement rocks are only sporadically exposed in small areas at the edges of the Western, North and South Australian Cratons; however, they preserve key …
-
The palaeoredox condition and morphological variation of microbialites from the Nama Group, South Africa
… only became persistently oxic during the mid-Palaeozoic. Oscillatory redox conditions occurred throughout the Cryogenian and Ediacaran Periods and the early Palaeozoic Era before this stability was reached. While oxic surface waters were present throughout the Proterozoic, there are open …
-
A study of epigenetic mineralisation in the Central Zone of the Damara Orogen, Namibia with special reference to gold, tungsten, tin and rare earth elements
… of the deeply eroded, Late Proterozoic/Early Palaeozoic, Pan-African Damara Orogen is hosted by meta-arkoses, marbles and metaturbidites in the magmatic arc (Central Zone; CZ) of the orogen, a tectonostratigraphic entity that is characterised by multiple deformation, …
Page 1 of 3