Trouw, Raj.: Mesozoic tectonic evolution of the South Orkney microcontinent, Scotia arc, Antarctica
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Personen: Trouw, Raj. (Autor) 
Passchier, Cornelis Willem (Autor) 
Simoes, Lsa. (Autor) 
Andreis, R. R. (Autor) 
Valeriano, C. M. (Autor) 
Titel: Mesozoic tectonic evolution of the South Orkney microcontinent, Scotia arc, Antarctica
Quelle: Geological magazine. Bd. 134. H. 3. Cambridge : Cambridge Univ. Press. S. 383 - 401
Erscheinungsjahr:    1997
ISBN / ISSN: 0016-7568
URL der Originalveröffentlichung doi:10.1017/S0016756897007036
Zeitschriftenaufsatz Zeitschriftenaufsatz
Sprache: Englisch
Open Access:
Person der Universität:    Passchier, Cornelis Willem  In UnivIS suchen 
Einrichtung: Institut für Geowissenschaften
DDC-Sachgruppe:    Geowissenschaften
ID: 52635  Universitätsbibliothek Mainz
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Abstract: The South Orkney Islands are the exposed part of a continental fragment on the southern limb of the Scotia are. The islands are to a large extent composed of metapelites and metagreywackes of probable Triassic sedimentary age. Deformation related to an accretionary wedge setting, with associated metamorphism from anchizone to the greenschist facies, are of Jurassic age (176-200 Ma). On Powell Island, in the centre of the archipelago, five phases of deformation are recognized. The first three, associated with the main metamorphism, are tentatively correlated with early Jurassic subduction along the Pacific margin of Gondwana. D-4 is a phase of middle to late Jurassic crustal extension associated with uplift. This extension phase may be related to opening of the Rocas Verdes basin in southern Chile, associated with the breakup of Gondwanaland. Upper Jurassic conglomerates cover the metamorphic rocks unconformably. D-5 is a phase of brittle extensional faulting probably associated with Cenozoic opening of the Powell basin west of the archipelago, and with development of the Scotia are.
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