Contribución al conocimiento petrológico y geoquímico de las Islas Shetland del Sur (Antártida)

• Autores: Encarnación Puga Rodríguez, Fernando Bohoyo Muñoz, Antonio Díaz de Federico, Jesús Galindo Zaldívar, Andrés Maldonado López
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 1, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)), págs. 97-100
• Idioma: español
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• Resumen

  • Petrological and geochemical analyses of rock samples from Livingston, King George and Deception Islands, Including Sr and Nd Isotope data, allow for a characterisation of the geodynamic evolution, from Palaeozoic to present, generating the magmatism in these islands. The subduction process of Pacific Plate under the Antarctic Peninsula, originated the Mesozoic to Cenozoic oceanic island arc volcanism of Livingston Island and the Cenozoic one of King George Island, whereas the present Deception Island volcanism was generated in a back-arc extensional setting. Moreover, we have identified at the Hurd Peninsula of Livingston Island, a calc-alkaline volcano-plutonic association, whose products are affected by metamorphism in prehnite-pumpellyite to low-P amphibolite facies, probably originated during the Late Carboniferous subduction of the proto-Pacific Plate below the South America continental margin.