Campos Estudio del margen oriental de la península Antártica a partir de datos gravimétricos y magnéticos
- Carmen Rey-Moral 1
- Fernando Bohoyo 1
- María Druet 1
- Alexander Golynsky 2
- Jesús Galindo Zaldívar 3
- 1 Instituto Geológico y Minero de España (Madrid)
- 2 VNIIOkeangeologia, All-Russian Scientific Research Institute for Geology and Mineral Resources of the World Ocean, St.-Petersburg, Russia
- 3 Departamento de Geodinámica. Universidad de Granada
ISSN: 0213-683X
Year of publication: 2020
Issue: 67
Pages: 99-102
Type: Article
More publications in: Geogaceta
Abstract
The Antarctic Peninsula, mainly composed of igneous and metamorphic rocks, was separated from South America during the opening of the Drake Passage from the Oligocene, as part of the Mesozoic-Cenozoic Andean orogenic belt. It was formed by processes related to the subduction of Pacific Ocean floor at its western margin, still active northwards of the Hero fracture zone, where the Bransfield backarc basin was developed. The eastern margin is less known due to its inaccessibility and is des-cribed as a continental passive margin gradually in transition to the Weddell Sea ocean floor. The modelling of 2 magnetic and gravimetric profiles shows [1] that the eastern margin of the Antarctic Peninsula depicts a progressively thinning of the upper crust towards the SE, [2] a remarkable sediment thickness changes, and [3] basaltic dikes related to the western edge of the Weddell Sea.