U-Pb geochronology of late Cretaceous and early Tertiary plutons in the northern Coast Mountains Batholith

George E Gehrels, W. C. McClelland, S. D. Samson, P. J. Patchett, D. A. Brew

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

U-Pb geochronologic studies demonstrate that steeply dipping, sheetlike tonalitic plutons along the western margin of the northern Coast Mountains Batholith were emplaced between ~83 and ~57 (perhaps ~55) Ma. Less elongate tonalitic-granodioritic bodies in central portions of the batholith yield ages of 59-58 Ma, coeval with younger phases of the tonalitic sheets. Large granite-granodiorite bodies in central and eastern portions of the batholith were emplaced at 51-48 Ma. Trends in ages suggest that the tonalitic bodies generally become younger southeastward and that, at the latitude of Juneau, plutonism migrated northeastward across the batholith at ~0.9 km/Ma. Old zircons, combined with evolved Nd isotopic signatures for most plutons, record assimilation of continental crustal or supracrustal rocks during the generation and (or) ascent of the plutons. -from Authors

Original languageEnglish (US)
Pages (from-to)899-911
Number of pages13
JournalCanadian Journal of Earth Sciences
Volume28
Issue number6
StatePublished - 1991

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batholith
geochronology
pluton
Cretaceous
mountain
coast
supracrustal rock
plutonism
granodiorite
zircon
granite
young

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

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U-Pb geochronology of late Cretaceous and early Tertiary plutons in the northern Coast Mountains Batholith. / Gehrels, George E; McClelland, W. C.; Samson, S. D.; Patchett, P. J.; Brew, D. A.

In: Canadian Journal of Earth Sciences, Vol. 28, No. 6, 1991, p. 899-911.

Research output: Contribution to journalArticle

Gehrels, George E ; McClelland, W. C. ; Samson, S. D. ; Patchett, P. J. ; Brew, D. A. / U-Pb geochronology of late Cretaceous and early Tertiary plutons in the northern Coast Mountains Batholith. In: Canadian Journal of Earth Sciences. 1991 ; Vol. 28, No. 6. pp. 899-911.
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