Open-File Report 2009–1144
This report presents all petrographic, major oxide, and trace element data for a set of 109 samples collected during an investigation of Jurassic igneous rocks in the Bald Mountain mining district, Nevada. Igneous rocks in the district include the Bald Mountain stock, quartz-feldspar porphyry dikes, basaltic andesite dikes, aplite sills, and rare lamprophyre dikes. These rocks, although variably altered near intrusion-related mineral deposits, are fresh in many parts of the district. Igneous rocks in the district are hosted by Paleozoic sedimentary rocks.
First posted July 23, 2009
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du Bray, E.A., 2009, Complete analytical data for Jurassic igneous rocks in the Bald Mountain mining district, Nevada: U.S. Geological Survey Open-File Report 2009–1144, 9 p.