Tuolumne Meadows quadrangle, California - analytic data

This report presents modal, chemical, and isotopic data for the intrusive rocks of the Tuolumne Meadows quadrangle in the high central Sierra Nevada, California, and supplements the previously published geologic map of the quadrangle. Most of the quadrangle is underlain by plutonic rocks of the compositionally and texturally zoned early Late Cretaceous Tuolumne Intrusive Suite. The data show that both compositons and initial ⁸⁷Sr/⁸⁶Sr change systematically inward from the margins of the Tuolumne intrusive Suite as the rocks become more felsic. The greatest changes are within 1 to 2 km of the margins. Metamorphic rocks and late Early Cretaceous plutonic rocks border the Tuolomne Intrusive Suite in the northwestern, northeastern, and southeastern parts of the quadrangle. -Authors