Mount Abbot Quadrangle, central Sierra Nevada, California; analytic data

Abstract

Modal compositions and specific gravities were determined for 329 samples of granitic rocks of the Mount Abbot quadrangle, California, and 23 selected granitic, volcanic, and metamorphic rocks were chemically and spectrographically analyzed. Modal data and specific gravities plotted on simplified geologic maps supplement the published geologic map of the quadrangle. Most of these data, except for specific gravities, do not show syst ematic, contourable variation within plutons.