Geochemical and Nd-Sr-Pb isotopic eviden
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Alan D. Smith; Derek Thorkelson
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Article
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2002
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John Wiley and Sons
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English
⚖ 679 KB
The mid-Cretaceous Spences Bridge Group (SBG) comprises a series of basaltic to rhyolitic lavas and related volcaniclastic rocks (Pimainus Formation) overlain by a succession of mainly amygdaloidal andesites (Spius Formation) related to the closure of the Methow-Tyaughton basin and accretion of the