000K  utf8
1100  $c2006
1500  eng
2050  urn:nbn:de:gbv:8-diss-17379
3000  Beier, Christoph
4000  The magmatic evolution of oceanic plateaus : a case study from the Azores$hChristian-Albrechts-Universität zu Kiel  [Beier, Christoph]
4030  Kiel$nChristian-Albrechts-Universität zu Kiel
4209  The formation and evolution of oceanic plateaus (e.g. Ontong Java Plateau, Iceland) have often been associated with the presence of melting anomalies in the upper mantle. These are characterised by the large spatial distribution of volcanism erupted in relatively short periods of time. Against this background, the present doctoral thesis presents an investigation of the formation and evolution of the submarine Azores Plateau.The wide spatial distribution of eruptions from 4.9 to 6.0 Ma ago is a result of the arrival of a relatively small melting anomaly beneath the lithosphere leading to the eruption of tholeiitic and alkaline lavas. Higher degrees of partial melting and the occurrence of depleted ‘MORB’-like isotopic compositions suggest eruptions in the vicinity of the MAR spreading axis. The Sr-Nd-Pb isotope systematics reveals a small scale heterogeneous mantle beneath the Azores, where each volcanic structure is defined by a single isotopic range, with only very limited mixing between them.
4950  https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-17379$xR$3Volltext$534
4961  https://macau.uni-kiel.de/receive/diss_mods_00001737
5051  550
5550  Azoren
5550  Azores
5550  Geochemistry
5550  Geochronologie
5550  Magmatism
5550  Mantle plume
5550  Petrology
5550  Plume-ridge interaction
5550  Ultraslow spreading rift
5550  Vulkanismus