{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Allen K. Andersen", "hasEmail": "mailto:akandersen@usgs.gov"}, "description": "Mineralized breccias at Hicks Dome, Illinois host abundant fluorspar, Pb-Zn sulfides, barite, rare earth elements (REE), and high field strength elements (HFSE). The REE+HFSE mineralogy of breccias between 600 and 900 meters were examined and mineral compositions were determined by electron probe microanalysis (EPMA), using a JEOL 8530F Plus field emission electron microprobe at the U.S. Geological Survey (USGS), Denver Microbeam Laboratory. The U-Th-Pb isotopic compositions and trace element concentrations of apatite were measured by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) at the USGS-LTRACE laboratory in Denver, Colorado.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P13FMHTL", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.68c9cec1d4be0274ff4b89c7.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_68c9cec1d4be0274ff4b89c7", "keyword": ["Hardin County, Illinois", "Hicks Dome", "Illinois-Kentucky fluorspar district", "Rosiclare, Illinois", "U-Pb geochronology", "USGS:68c9cec1d4be0274ff4b89c7", "electron probe microanalysis", "fluorspar", "geoscientificInformation", "high field strength elements", "lamprophyre", "laser ablation inductively coupled plasma mass spectrometry", "rare earth elements"], "modified": "2025-12-17T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-88.4100, 37.4000, -88.0700, 37.6100", "theme": ["geospatial"], "title": "Mineral chemistry and U-Th-Pb geochronology of critical mineral-enriched breccia samples from Hicks Dome, southern Illinois"}