Detrital zircon geochronology of the Taku terrane, southeast Alaska

Research output: Contribution to journalArticle

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Abstract

U-Pb geochronologic studies have been conducted on 60 detrital zircon grains from Permian(?) and Triassic metasandstones of the Taku terrane in central southeast Alaska. The resulting ages are mainly in the range 349-387 Ma, with five additional grains that yield probable ages ranging from ∼906 to ∼2643 Ma. These ages are similar to the ages of detrital zircons in Carboniferous and older rocks of the Yukon-Tanana terrane, which lies directly east of the Taku terrane. In contrast, these ages are different from the ages of detrital zircon grains in the Alexander terrane to the west. The data are accordingly consistent with models in which the Taku terrane is a western component of the Stikine and Yukon-Tanana terranes, and that this crustal fragment is separated by a fundamental tectonic boundary from rocks of the Alexander and Wrangellia terranes to the west.

Original languageEnglish (US)
Pages (from-to)921-931
Number of pages11
JournalCanadian Journal of Earth Sciences
Volume39
Issue number6
DOIs
StatePublished - 2002

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geochronology
terrane
zircon
rock
Permian
Triassic
tectonics

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Detrital zircon geochronology of the Taku terrane, southeast Alaska. / Gehrels, George E.

In: Canadian Journal of Earth Sciences, Vol. 39, No. 6, 2002, p. 921-931.

Research output: Contribution to journalArticle

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