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Titolo:
MESOZOIC TECTONIC EVOLUTION OF THE SOUTH ORKNEY MICROCONTINENT, SCOTIA ARC, ANTARCTICA
Autore:
TROUW RAJ; PASSCHIER CW; SIMOES LSA; ANDREIS RR; VALERIANO CM;
Indirizzi:
UFRJ,IGEO,DEPT GEOL BR-21910900 RIO JANEIRO BRAZIL UNIV MAINZ,INST GEOWISSENSCH D-55099 MAINZ GERMANY UNESP,DEPT GEOL BR-13506900 RIO CLARO SP BRAZIL UERJ,DEPT GEOL RIO JANEIRO BRAZIL
Titolo Testata:
Geological Magazine
fascicolo: 3, volume: 134, anno: 1997,
pagine: 383 - 401
SICI:
0016-7568(1997)134:3<383:MTEOTS>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMPLEX ROCKS; SIGNY-ISLAND; PENINSULA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
63
Recensione:
Indirizzi per estratti:
Citazione:
R.A.J. Trouw et al., "MESOZOIC TECTONIC EVOLUTION OF THE SOUTH ORKNEY MICROCONTINENT, SCOTIA ARC, ANTARCTICA", Geological Magazine, 134(3), 1997, pp. 383-401

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 Triassicsedimentary 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 ofGondwanaland. 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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Documento generato il 06/04/20 alle ore 00:12:31