{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "U.S. Geological Survey, Alaska Science Center", "hasEmail": "mailto:gs-ak_asc_datamanagers@usgs.gov"}, "description": "This data release contains three tables of U-Pb zircon isotopic data generated from analyses of 40 metaplutonic and metavolcanic rocks from the Yukon-Tanana Upland of western Yukon and east-central Alaska and one sample from southern Yukon. One of the tables also reports U-Pb data for two titanite analyses for one of the samples. U-Pb zircon ages from analyzed samples range from 363.5 \u00b1 3.8 to 253.1 \u00b1 0.7 Ma and were collected from parautochthonous North America and the allochthonous Yukon-Tanana terrane. U-Pb zircon data include 216 individual analyses by ID-TIMS and 35 individual analyses of two samples by LA-ICP-MS. ID-TIMS analyses of titanite give concordant 206Pb-238U ages of 333 and 338 Ma. Two U-Pb tables report the isotopic composition of uranium (U) and thorium (Pb) measured in each grain, ratios of isotopes of lead and uranium isotopes, and the age of each grain. A third table reports interpreted U-Pb ages, sample locations, tectonic assemblage or unit, lithology, analysis method, laboratory used, and basis for age assignment. The data release also contains two tables of whole-rock major- and trace-element geochemical data for metaigneous rocks from the Yukon-Tanana Upland in east-central Alaska for augen gneiss (15 samples) and amphibolite (30 samples).", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P93ZWGA1", "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.ASC548.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_ASC548", "keyword": ["Age determinations", "Alaska", "Big Delta", "Eagle", "Fairbanks", "GeoScientificInformation", "Geochemistry", "Geochronology", "Geology", "Igneous rocks", "Isotopes", "Isotopic analysis", "Major elements", "Metamorphic rocks", "Minor elements", "Radioactive elements", "Radiometric dating", "Tanacross", "Trace elements", "USGS:ASC548", "Uranium-lead analysis", "Uranium-thorium analysis", "Whole-rock geochemistry", "Yukon"], "modified": "2024-12-16T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-147.93, 61.49, -132.45, 64.92", "theme": ["geospatial"], "title": "New U-Pb Geochronology and Geochemistry of Paleozoic Metaigneous Rocks from Western Yukon and Eastern Alaska"}