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Titolo:
Kilometre-scale folding in the Teslin zone, northern Canadian Cordillera, and its tectonic implications for the accretion of the Yukon-Tanana terraneto North America
Autore:
de Keijzer, M; Williams, PF; Brown, RL;
Indirizzi:
Univ New Brunswick, Dept Geol, Fredericton, NB E3B 5A3, Canada Univ New Brunswick Fredericton NB Canada E3B 5A3 cton, NB E3B 5A3, Canada Carleton Univ, Ottawa Carleton Geosci Ctr, Ottawa, ON K1S 5B6, Canada Carleton Univ Ottawa ON Canada K1S 5B6 ci Ctr, Ottawa, ON K1S 5B6, Canada Carleton Univ, Dept Earth Sci, Ottawa, ON K1S 5B6, Canada Carleton Univ Ottawa ON Canada K1S 5B6 th Sci, Ottawa, ON K1S 5B6, Canada
Titolo Testata:
CANADIAN JOURNAL OF EARTH SCIENCES
fascicolo: 3, volume: 36, anno: 1999,
pagine: 479 - 494
SICI:
0008-4077(199903)36:3<479:KFITTZ>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-PRESSURE METAMORPHISM; EAST-CENTRAL ALASKA; SOUTH-CENTRAL YUKON; SUTURE ZONE; KINEMATIC EVOLUTION; SOUTHEASTERN YUKON; RB-SR; U-PB; CONSTRAINTS; MARGIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: de Keijzer, M Univ New Brunswick, Dept Geol, Fredericton, NB E3B 5A3, Canada Univ New Brunswick Fredericton NB Canada E3B 5A3 A3, Canada
Citazione:
M. de Keijzer et al., "Kilometre-scale folding in the Teslin zone, northern Canadian Cordillera, and its tectonic implications for the accretion of the Yukon-Tanana terraneto North America", CAN J EARTH, 36(3), 1999, pp. 479-494

Abstract

The Teslin zone in south-central Yukon has previously been described as a discrete zone with a steep foliation unique to the zone. It includes the Anvil assemblage and the narrowest portion of the Yukon-Tanana terrane (the Nisutlin assemblage), and is defined by post-accretionary faults: the Big Salmon fault to the west and the d'Abbadie fault system to the east. The zonewas interpreted as a lithospheric suture or a crustal-scale transpression zone, and as the root zone of klippen lying on the North American craton tothe east. We demonstrate that deformation and metamorphism are the same inside and outside the zone. The steep transposition foliation in the zone, in contrast to adjacent rocks to the east, coincides with the steep limb of a regional F-3 structure. This fold has a shallow limb in the easternmost part of the zone and immediately east of the zone. Thus we reject earlier interpretations. If a suture exists between the obducted Anvil and Yukon-Tanana Nisutlin assemblages and North America, it is a shear zone that occurs at the base of the obducted rocks, which has been folded by the F-3 fold. However, evidence that this thrust boundary is a lithospheric suture is lacking. A consequence of our interpretation is that North American rocks pass under the eastern Teslin zone and outcrop to the west of the Nisutlin and Anvil assemblages. This geometry precludes the possibility of the Teslin zonebeing the root zone of the klippen.

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Documento generato il 09/07/20 alle ore 17:04:02