U-Pb zircon geochronology of Lower Jurassic and Paleozoic Stikinian strata and Tertiary intrusions, northwestern British Columbia

C. J. Greig, George E Gehrels

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

New U-Pb zircon ages are reported from western Stikinia. Devonian and Pennsylvanian ages of volcanic rocks at Oweegee dome confirm the presence of pre-Permian strata, and with Paleozoic and Triassic detrital zircons from Lower Jurassic sandstone, they help to demonstrate pre-Lower Jurassic deformation and uplift. The absence of pre-Paleozoic inherited zircon from all samples is consistent with Nd-Sr isotopic data which suggest that Stikinia consists mainly of juvenile crust. U-Pb ages for posttectonic intrusions suggest that structures in Skeena Fold Belt in the Kinskuch area formed prior to Eocene time. Five ages for felsic volcanic rocks suggest near-contemporaneity for cessation of volcanism in the areas studied. -from Authors

Original languageEnglish (US)
Pages (from-to)1155-1171
Number of pages17
JournalCanadian Journal of Earth Sciences
Volume32
Issue number8
StatePublished - 1995
Externally publishedYes

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geochronology
zircon
Paleozoic
Jurassic
volcanic rock
felsic rock
Pennsylvanian
fold belt
dome
volcanism
Permian
Eocene
Triassic
uplift
sandstone
crust

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

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AB - New U-Pb zircon ages are reported from western Stikinia. Devonian and Pennsylvanian ages of volcanic rocks at Oweegee dome confirm the presence of pre-Permian strata, and with Paleozoic and Triassic detrital zircons from Lower Jurassic sandstone, they help to demonstrate pre-Lower Jurassic deformation and uplift. The absence of pre-Paleozoic inherited zircon from all samples is consistent with Nd-Sr isotopic data which suggest that Stikinia consists mainly of juvenile crust. U-Pb ages for posttectonic intrusions suggest that structures in Skeena Fold Belt in the Kinskuch area formed prior to Eocene time. Five ages for felsic volcanic rocks suggest near-contemporaneity for cessation of volcanism in the areas studied. -from Authors

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