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Titolo:
Paleomagnetism and geobarometry of the Big Creek Batholith suggests that the Yukon-Tanana Terrane has been a parautochthon since Early Jurassic
Autore:
Symons, DTA; Williams, PR; McCausland, PJA; Harris, MJ; Hart, CJR; Blackburn, WH;
Indirizzi:
Univ Windsor, Windsor, ON N9B 3P4, Canada Univ Windsor Windsor ON Canada N9B 3P4 ndsor, Windsor, ON N9B 3P4, Canada Univ Western Ontario, Dept Earth Sci, London, ON N6A 5B7, Canada Univ Western Ontario London ON Canada N6A 5B7 London, ON N6A 5B7, Canada Govt Yukon, Yukon Geol Program, Whitehorse, YT Y1A 2C6, Canada Govt YukonWhitehorse YT Canada Y1A 2C6 m, Whitehorse, YT Y1A 2C6, Canada Royal Rd Univ, Victoria, BC V9B 5Y2, Canada Royal Rd Univ Victoria BC Canada V9B 5Y2 iv, Victoria, BC V9B 5Y2, Canada
Titolo Testata:
TECTONOPHYSICS
fascicolo: 1-2, volume: 326, anno: 2000,
pagine: 57 - 72
SICI:
0040-1951(20001110)326:1-2<57:PAGOTB>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRETACEOUS CARMACKS GROUP; IN-HORNBLENDE BAROMETER; EAST-CENTRAL ALASKA; NORTHERN CORDILLERA; CANADIAN-CORDILLERA; EVOLUTION; TERRITORY; TECTONICS; MA;
Keywords:
Big Creek Batholith; geobarometry; paleomagnetism; Yukon-Tanana terrane; Canada; Jurrasic; tectonics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Symons, DTA Univ Windsor, Windsor, ON N9B 3P4, Canada Univ Windsor Windsor ON Canada N9B 3P4 or, ON N9B 3P4, Canada
Citazione:
D.T.A. Symons et al., "Paleomagnetism and geobarometry of the Big Creek Batholith suggests that the Yukon-Tanana Terrane has been a parautochthon since Early Jurassic", TECTONOPHYS, 326(1-2), 2000, pp. 57-72

Abstract

The similar to 190+/-5 Ma Big Creek hornblende-syenite and monzogabbro batholith has an outcrop area of similar to 400 km(2) within the Yukon-Tanana Terrane (YTT) in the west-central part of the Yukon Territory of Canada. Paleomagnetic analysis of 245 specimens from 21 sites isolates a characteristic remanent magnetization residing principally in magnetite and subordinately in hematite. The unit mean direction for the batholith from 16 normal polarity and two reverse polarity sites is D = 305.6 degrees, I = 72.1 degrees (alpha (95) = 3.9 degrees). Al-in-hornblende geothermobarometry at six locations yields emplacement depths of similar to 16+/-2 km. Three arguments suggest that the characteristic remanent magnetization was acquired on exhumation at similar to 180 Ma. More significantly, the pole position indicates no northward translation but counterclockwise rotation, implying that theYTT formed close to its present position on the Jurassic margin of the North American craton, This implies, in turn, that the allochthonous terranes of the Intermontane and Coast belts of the western Cordillera impacted onto, and overrode, the YTT upon accretion during Late Cretaceous to Middle Eocene time. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 09/07/20 alle ore 15:19:52