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This document discusses Re and Os isotopic data from volcanic rocks in the central Oregon Cascades. It finds that basalts have lower 187Os/188Os ratios than basaltic andesites, indicating interaction with mafic crust. Modeling suggests the deep arc crust has 187Re/188Os ratios within the range measured in North Sister volcanoes, implying a mafic crustal contaminant age of 9-29 million years. Comparisons to other Cascade centers show their crust is more heterogeneous, with a wider range of possible contamina

Author

Abhinav Pandey

Language

EN