Titanium Dioxide in Pyroclastic Layers from Volcanoes in the Cascade Range

Abstract

Rapid determinations of titanium dioxide have been made by x-ray emission techniques to evaluate the potentiality of using the TiO₂ content of samples for checking field correlations and assisting in identification of pyroclastic units from Cascade volcanoes. Preliminary data suggest that the two most wide-spread units have characteristic ranges of TiO₂ content and that other, less extensive layers have ranges which, though characteristic, often overlap the ranges of the more widespread layers. Relative to fresh samples,. weathered samples from B and C soil horizons are enriched in TiO₂.