Abstract
Nd isotopes in clastic 600-75 Ma sedimentary rocks from the miogeocline of Alberta and British Columbia are used to (1) constrain the importance of proximal and distal North-American basement and juvenile Cordilleran sedimentary sources; (2) document large-scale changes in provenance; and (3) develop a North American miogeoclinal reference for Nd isotopes as a baseline for continental input to Cordilleran terranes. Initial $\epsilon_{Nd}$ for Neoproterozoic to Upper Ordovician samples range from -14 to -22 and can be explained by derivation from proximal Precambrian basement. A positive shift of six $\epsilon_{Nd}$ units occurs between Late Ordovician and Late Devonian time and persists until foreland basin formation in the Late Jurassic. $\epsilon_{Nd}$ for this 370-170 Ma period ranges from - 6 to - 9 and requires involvement of a more juvenile source. Cretaceous foreland basin sediments show extreme heterogeneity, with $\epsilon_{Nd}$ from zero to -12. High values can be explained by incorporation of v...
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