info:eu-repo/semantics/doctoralThesis
The Triassic–Cretaceous Tectonomagmatic History of the Antarctic Peninsula constrained by Geochronology, Thermochronology and Isotope Geochemistry
Autor
Bastias, Joaquin
Institución
Resumen
This thesis presents new geochronological, thermochronological, geochemical and isotopic data from igneous and meta-igneous rock samples from the Antarctic Peninsula during the Mesozoic. This crustal block, part of West Antarctica, has a long tectonic and magmatic history, complex topography and distinct geological provinces. Furthermore, the Antarctic Peninsula has been affected by complex convergent margin processes and defies simple classification as a convergent margin, magmatic arc or rifted continental margin. A new quantitative dataset is presented that includes analyses of (i) U-Pb zircon dates, (ii) zircon Lu-Hf isotopes, (iii) zircon O isotopes, (iv) Sr-Nd-Pb isotopes, (v) U-Pb apatite thermochronology and (vi) whole-rock geochemistry. This new dataset provides solid foundations for investigating the geological history of the Antarctic Peninsula and southwestern Gondwana, and they are used to construct a new model for the tectonic evolution of the margin of the Antarctic Peninsula and Patagonia during the late Palaeozoic and Mesozoic.