Filters: Tags: mineralogy (X) > partyWithName: Michael A Cosca (X)

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40Ar/39Ar geochronology of the Tonopah, Divide, and Goldfield districts, Nevada Ar/Ar data are reported from minerals and rocks that were collected as part of a mineral resource investigation of the Tonopah, Divide, and Goldfield districts in Nevada. Data are reported from 92 samples and associated standards from eight separate neutron irradiations in the Denver USGS TRIGA reactor, including separated mineral grains and whole rocks. Data were collected by infrared laser heating of irradiated samples, either incremental heating or fusion, and analysis by multi-collector mass spectrometry. The reported data have been corrected for blanks, radioactive decay, and interfering nucleogenic reactions associated with sample irradiation. Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: 40Ar/39Ar, Ar, Divide district, Geochemistry, Goldfield, All tags... Goldfield district, Mineralogy, Nevada, Nye County, Structural Geology, Tonopah, Tonopah district, USGS Science Data Catalog (SDC), USGS TRIGA reactor, Volcanology, argon, geochronology, gold mineralization, infrared laser, mapping, mass spectrometry, mineral exploration, mineralization, neutron irradiation, Fewer tags U-Pb SHRIMP and 40Ar/39Ar geochronologic data and backscatter electron (BSE) and panchromatic cathodoluminescent (CL) imagery of sample materials for study of dikes, country rock, and alteration systems, Butte, U.S.A. These data are for a multidisciplinary study of dikes, country rock, and alteration systems, Butte, U.S.A. Results of the study are described and interpreted in Lund and others (2018). Data included are U-Pb SHRIMP geochronology for quartz porphyry dikes, 40Ar/39Ar thermochronologic data for biotite, hornblende, and K-feldspar from Butte granite country rock, and 40Ar/39Ar thermochronologic data for white mica and K-feldspar from alteration zones around lode veins. Also included are backscatter electron (BSE) and panchromatic cathodoluminescent (CL) imagery of minerals from samples dated by 40Ar/39Ar. These data are shared to meet open data requirements for interpretive report: Lund, K., McAleer, R.J., Aleinikoff,... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: 40Ar/39Ar geochronology, 40Ar/39Ar geochronology, Ag-polymetallic lodes, BSC, Butte, All tags... CL, Cu lodes, GGGSC, Geology, Geophysics, and Geochemistry Science Center, MRP, Mineral Resources Program, Mineralogy, Montana, SHRIMP, SHRIMP, Sensitive high-resolution ion microprobe, Structural Geology, U-Pb geochronology, U-Pb geochronology, USGS Science Data Catalog (SDC), United States, alteration, backscatter electron, copper, economic geology, geochronology, geoscientificInformation, molybdenum, panchromatic cathodoluminescent, quartz porphyry dikes, radiometric dating, silver, Fewer tags