Compositions, modes, isotope values, and microthermometry of igneous minerals, epigenetic minerals, and fluid inclusions, and compositions and isotope values of igneous and mineralized whole rock samples in the Goldfield, Tonopah, Comstock Lode and other

This dataset consists of varietal modal, chemical, and isotopic analyses and petrographic observations made episodically from 1982-2026 on samples of igneous rocks and epigenetic minerals collected in the Goldfield district, Esmeralda County, Nevada, Tonopah district, Nye County, Nevada, Comstock Lode district, Storey, Washoe, and Lyon Counties, Nevada, and other districts in Nevada, and on archival specimens borrowed from the Keck Museum (University of Nevada, Reno, Reno, Nevada), Smithsonian Institution (Washington, D.C.), The Field Museum of Chicago (Chicago, Illinois), Leland Stanford Junior University (Stanford, California), Harvard University (Cambridge, Massachusetts), and gifted by associates. Tables from this data release are cited in USGS SIR _____ “Stratigraphy, Structure, and Epigenetic Mineralogy of the Goldfield District “The dataset includes whole rock geochemistry, igneous and epigenetic mineral, modal, chemical, and isotope compositions determined by petrography, scanning electron microscopy (SEM), electron microprobe analyses (EMPA), laser ablation-multi collector-inductively coupled-mass spectrometry (LA-MC-ICP-MS), laser ablation-inductively coupled-mass spectrometry (LA-ICP-MS), and paleofluid properties determined by fluid inclusion microthermometry. In addition to archival and gifted specimens, samples were obtained from surface exposures, mine workings and dumps, and drill core. They were analyzed by commercial and USGS laboratories, including USGS contract geochemistry laboratories, USGS laser ablation and stable isotope laboratories in Denver, Colorado, the USGS electron microprobe laboratory in Menlo Park, California (now at Moffett Field, California), the University of Nevada Reno scanning electron microscopy and electron microprobe laboratory in Reno, Nevada, a contract electron microprobe laboratory, numerous commercial geochemical laboratories, fluid inclusion analytical laboratories maintained by associates, and fluid inclusion microthermometric instrumentation maintained by a mining company.