... on a suite of intrusions within the Santa Rosa Range (SRR) and Bloody Run Hills (BRH) of northwestern Nevada. Petrography, whole-rock geochemistry, and zircon U-Pb geochronology indicate two distinct magmatic systems in the SRR: an older, mafic, and metaluminous pulse (Santa Rosa/Andorno [SRA] group—ca. 102...

... similar to the Andorno Formation ( Fig. 5 , Table 1 ): both contain 15% metasandstone and 10%–15% metasiltstone, with some carbonate interbeds; metasandstones in both units contain significant feldspar as well as quartz and show a well-developed spaced cleavage but no quartz veins; and metasandstones...

... along an east-west transect, and an additional sample from the Andorno stock farther south along the range front ( Fig. 2 ; see also Fig. DR-1 and Table DR-1 1 ). In general, the samples from the Santa Rosa stock yielded abundant, high-quality apatite, whereas apatite from the Sawtooth stock...