Age, construction, and exhumation of the midcrust of the Jurassic Bonanza arc, Vancouver Island, Canada

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dc.contributor.author Canil, D.
dc.contributor.author Johnston, S.T.
dc.contributor.author Larocque, J.
dc.contributor.author Friedman, R.
dc.contributor.author Heaman, L.M.
dc.date.accessioned 2018-10-10T12:31:33Z
dc.date.available 2018-10-10T12:31:33Z
dc.date.copyright 2013 en_US
dc.date.issued 2013
dc.identifier.citation Canil, D., Johnston, S.T., Larocque, J., Friedman, R., & Heaman, L.M. (2013). Age, construction, and exhumation of the midcrust of the Jurassic Bonanza arc, Vancouver Island, Canada. Lithosphere, 5(1), 82-91. https://doi.org/10.1130/L225.1 en_US
dc.identifier.issn https://doi.org/10.1130/L225.1
dc.identifier.uri https://dspace.library.uvic.ca//handle/1828/10145
dc.description.abstract We present new U-Pb zircon ages for heterogeneous mafic-felsic rocks of the West Coast complex, a midcrustal plutonic component of exposed Jurassic arc-crustal section on Vancouver Island. We examine the timing of juvenile plutonic crust production, and consanguinity of volcanism and plutonism in this arc. The midcrustal plutons were emplaced between 193 Ma and 174 Ma, contemporaneous with the upper-crustal (<10 km depth) plutonic component of the arc (Island plutonic suite). A 12 km thickness of plutonic arc crust was built as a series of sheets at a rate of ∼0.003 km3 yr−1. Deformation and emplacement were contemporaneous, and there are no correlations among age, differentiation (peridotite to granite), or structural level of plutons in the arc. The age range and a weak eastward younging age polarity of the Jurassic arc section on Vancouver Island match that of the Talkeetna arc-crustal section in Alaska, suggesting that the two arcs are correlative and evolved by either forearc erosion above of an east-dipping slab, or slab rollback during west-dipping subduction. en_US
dc.description.sponsorship Research funding was provided by Emeralds Field Resources, Geoscience BC, and Natural Sciences and Engineering Research Council (NSERC) of Canada (to Canil). en_US
dc.language.iso en en_US
dc.publisher Lithosphere en_US
dc.subject absolute age en_US
dc.subject Bonanza Group en_US
dc.subject British Columbia en_US
dc.subject Canada en_US
dc.subject diorites en_US
dc.subject grandiorites en_US
dc.subject igneous rocks en_US
dc.subject Jurassic en_US
dc.subject Mesozoic en_US
dc.subject plutonic rocks en_US
dc.subject quartz diorites en_US
dc.subject Victoria British Columbia en_US
dc.subject Vancouver Island en_US
dc.subject U/Pb en_US
dc.subject crust en_US
dc.subject quartz monzonite en_US
dc.subject Western Canada en_US
dc.title Age, construction, and exhumation of the midcrust of the Jurassic Bonanza arc, Vancouver Island, Canada en_US
dc.type Article en_US
dc.description.scholarlevel Faculty en_US
dc.description.reviewstatus Reviewed en_US

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