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Titolo:
CACHE CREEK TERRANE ENTRAPMENT - OROCLINAL PARADOX WITHIN THE CANADIAN CORDILLERA
Autore:
MIHALYNUK MG; NELSON J; DIAKOW LJ;
Indirizzi:
MINIST ENERGY MINES & PETR RESOURCES,BRITISH COLUMBIA GEOL SURVEY BRANCH,1810 BLANSHARD ST VICTORIA V8V 1X4 BC CANADA
Titolo Testata:
Tectonics
fascicolo: 3, volume: 13, anno: 1994,
pagine: 575 - 595
SICI:
0278-7407(1994)13:3<575:CCTE-O>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
YUKON-TANANA TERRANE; CONTINENTAL-MARGIN ASSEMBLAGE; CENTRAL BRITISH-COLUMBIA; NORTHERN COAST MOUNTAINS; EAST-CENTRAL ALASKA; U-PB; PALEOMAGNETIC EVIDENCE; TECTONIC EVOLUTION; AMERICA; AREA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
125
Recensione:
Indirizzi per estratti:
Citazione:
M.G. Mihalynuk et al., "CACHE CREEK TERRANE ENTRAPMENT - OROCLINAL PARADOX WITHIN THE CANADIAN CORDILLERA", Tectonics, 13(3), 1994, pp. 575-595

Abstract

Exotic and far-traveled oceanic crustal rocks of the Cache Creek terrane (CC) are bordered by less exotic Quesnel (QN) and Stikine (ST) arcterranes to the east, north, and west. All of these terranes are enveloped by an arcuate belt of displaced continental margin rocks, the Kootenay (KO), Nisling (NS), and parts of the Yukon-Tanana (YTT) terranes, that have indirect ties to ancestral North America (NA). Initial Sr-87/Sr-86 isopleths conform to this arcuate pattern. Such a pattern ofconcentric belts presents a geological conundrum: How did the QN, ST,and CC come to be virtually enveloped by terranes with ties to NA? Past and current models that explain assembly of the Canadian Cordilleraare deficient in their treatment of this problem. We propose that Early Mesozoic QN and ST were joined through their northern ends as two adjacent arc festoons that faced south toward the Cache Creek ocean (Panthalassa?). Oceanic plateau remnants within the CC today were transported from the Tethyan realm and collided with these arcs during subduction of the Cache Creek ocean. Counterclockwise oroclinal rotation of ST and NS terranes in the Late Triassic to Early Jurassic caused enclosure of the CC. Rotation continued until these terranes collided with QN in the Middle Jurassic. Paleomagnetic declination data provide support for this model in the form of large average anticlockwise rotations for Permian to Early Jurassic sites in ST but moderate clockwise rotations for sites in QN. Specific modem analogues for the Cordilleran orocline include the Yap trench, where the Caroline rise is colliding end-on with the Mariana Arc and the Banda Arc, located on the southeastern ''tail'' of the Asian plate, which is being deformed into a tight loop by interactions with the Australian and Pacific plates.

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Documento generato il 03/07/20 alle ore 22:53:02