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Doctoral thesis
Open access
English

The Triassic–Cretaceous Tectonomagmatic History of the Antarctic Peninsula constrained by Geochronology, Thermochronology and Isotope Geochemistry

Defense date2020-08-27
Abstract

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.

eng
Keywords
  • Antarctic Peninsula
  • Arc magmatism
  • Active margin
  • Gondwana
  • West Antarctica
  • Patagonia
Citation (ISO format)
BASTIAS SILVA, Miguel Joaquin. The Triassic–Cretaceous Tectonomagmatic History of the Antarctic Peninsula constrained by Geochronology, Thermochronology and Isotope Geochemistry. 2020. doi: 10.13097/archive-ouverte/unige:143280
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Creation10/13/2020 5:11:00 PM
First validation10/13/2020 5:11:00 PM
Update time05/08/2023 10:31:00 AM
Status update05/08/2023 10:31:00 AM
Last indexation01/29/2024 10:22:15 PM
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