The Triassic–Cretaceous Tectonomagmatic History of the Antarctic Peninsula constrained by Geochronology, Thermochronology and Isotope Geochemistry
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 dis...
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| Format: | Doctoral or Postdoctoral Thesis |
| Language: | English |
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Université de Genève
2020
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| Online Access: | https://archive-ouverte.unige.ch/unige:143280 https://doi.org/10.13097/archive-ouverte/unige:143280 |
| Summary: | 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. |
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