These data are for a regional geochronologic study of Mesoproterozoic rocks in the St. Francois Mountains, southeast Missouri. Zircon, plus one sample of titanite, from fifty samples of metaigneous rocks were dated by sensitive high resolution ion microprobe (SHRIMP).

This dataset accompanies proposed publication, "Tectonic disruption of the Proterozoic Yavapai-Matzatzal Province boundary near Sierra Hornaday, northwest Sonora", to be published in a Geological Society of America publication, which will report zircon SHRIMP-RG U-Pb ages and Sm-Nd whole rock isotope analyses to map the path of the Yavapai-Matzatzal province boundary across southwest Arizona and northwest Sonora. Samples were collected from the study area by Jon Nourse, Miguel Espinoza, and Erin Stahl (all of Cal. State Polytechnic Univ.), Karl Kellogg, Wayne Premo, Douglas Morton, Jonathan Matti, Barney Poole, and Alex Iriondo (all of the USGS), Thomas Anderson (Univ. of Pittsburgh), Leon Silver and Michael Oskin (all of Cal. Inst. Tech.), and Bryan Kriens (Cal. State Univ., Dominguez Hills), who brought them to the USGS Denver for analysis. The analyses were performed from Dec 2001 to August 2018.

These data are for a geochronologic study of emplacement ages for plutons of the Cretaceous Idaho batholith and detrital zircon ages for metasedimentary rocks, west-central Idaho. Zircon from six samples of discrete plutons across a regional transect were dated by sensitive high resolution ion microprobe (SHRIMP). SHRIMP U-Pb ages of igneous rocks connect the igneous activity to structural history, crustal depths, and origins of epigenetic gold-silver-antimony-tungsten±mercury mineral deposits. Zircon from four samples of metasedimentary rocks in the southern part of the central Idaho mineral province were dated - three by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) methods and one by SHRIMP methods - to provide maximum depositional ages and details about original sedimentary provenances. These SHRIMP and LA-ICPMS U-Pb data are shared to meet open data requirements.

This data set contains tables containing uranium-lead (U-Pb) isotopic data and the crystallization age of zircon from a metamorphic rock from the Manzano Mountains, New Mexico, collected in 2005. The bulk sample was processed into concentrated mineral separates of zircon at the University of Texas at Austin and analyzed by U.S. Geological Survey (USGS) research scientists at the Stanford-USGS Sensitive High Resolution Ion Microprobe with Reverse-Geometry (SHRIMP-RG) at Stanford University. The data table "geochronology_SHRIMP-RG_manzanoMtns_jones.csv" accompanying this data release reports the isotopic composition of uranium (U) and thorium (Th) measured in each grain, ratios of two isotopes of lead (207Pb and 206Pb) and two isotopes of uranium (235U and 238U), the age of each grain, and concentrations of selected trace elements measured in each grain. A second table "geochronology_sampleSummary_manzanoMtns_jones.csv" reports the sample location, rock characteristics, and interpreted age. Additionally, a third data table "geochronology_dataDictionary_manzanoMtns_jones.csv" is provided as a reference guide for the user.

This data set contains tables containing uranium-lead (U-Pb) isotopic data and the crystallization age of zircon from a metamorphic rock from the Manzano Mountains, New Mexico, collected in 2005. The bulk sample was processed into concentrated mineral separates of zircon at the University of Texas at Austin and analyzed by U.S. Geological Survey (USGS) research scientists at the Stanford-USGS Sensitive High Resolution Ion Microprobe with Reverse-Geometry (SHRIMP-RG) at Stanford University. The data table "geochronology_SHRIMP-RG_manzanoMtns_jones.csv" accompanying this data release reports the isotopic composition of uranium (U) and thorium (Th) measured in each grain, ratios of two isotopes of lead (207Pb and 206Pb) and two isotopes of uranium (235U and 238U), the age of each grain, and concentrations of selected trace elements measured in each grain. A second table "geochronology_sampleSummary_manzanoMtns_jones.csv" reports the sample location, rock characteristics, and interpreted age. Additionally, a third data table "geochronology_dataDictionary_manzanoMtns_jones.csv" is provided as a reference guide for the user.

These data are U-Pb sensitive high-resolution ion microprobe (SHRIMP) geochronology data from quartz porphyry dikes for the study of the Butte mining district, U.S.A. Results of the study are described and interpreted in Lund and others (2018).

This data set contains U-Pb isotopic data and associated ages of titanite from one sample and detrital zircon grains from 33 sedimentary and metasedimentary rocks collected from the western Alaska Range in south-central Alaska. The samples were collected as part of geological mapping and research conducted between 2010 and 2014 and funded by the Mineral Resources Program of the U.S. Geological Survey. Titanite was separated by Apatite to Zircon, Inc. (A2Z) and analyzed by USGS research staff at the Stanford-US Geological Survey (USGS) Sensitive High Resolution Ion Microprobe with Reverse-Geometry (SHRIMP-RG) at Stanford University. Detrital zircon grains from each of the 33 samples were separated and analyzed by Apatite to Zircon, Inc. (A2Z) and GeoSep Services (GSS) laboratories between 2011 and 2014, using laser-ablation-inductively-coupled-plasma-mass spectrometry (LA-ICP-MS) techniques described in the supplemental file. The data tables report the concentration of the radioactive elements uranium (U) and thorium (Th) measured in each grain, corrected ratios of two isotopes of lead (207Pb and 206Pb) to two isotopes of uranium (235U and 238U), and the geologic age of each grain calculated from the isotopic ratios. The titanite data table also reports concentrations of selected trace elements measured in each grain.

This data release includes laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) U-Pb zircon geochronology data to determine the ages of Challis igneous rocks in the Thunder Mountain volcanic field and dikes west of the volcanic field, especially in and near the Stibnite-Yellow Pine mining district, ID. These efforts were made to help understand the stratigraphy and lithologic characteristics of the Challis igneous rocks by determining their absolute ages.

Samples of vein-type magmatic-steam alunite were collected over several field seasons from five mines and prospects (L&N, Mt. Edna, Christmas, upper Mineral Products, and Close In) in the Alunite Ridge and Deer Trail Mountain area, Marysvale, Utah, as well as a sample from the Deer Trail mine workings from which sericite was separated. The magmatic-steam alunite and sericite were analyzed by the 40Ar/39Ar method to constrain the timing and duration of magmatic activity associated with the intrusion of two porphyry stocks beneath Alunite Ridge and Deer Trail Mountain. In addition, a sample of a highly altered rhyolitic quartz porphyry dike was collected from the upper Mineral Products mine, from which zircons were separated and analyzed using a sensitive high resolution ion microprobe reverse geometry (SHRIMP-RG) to determine a U/Pb date and quantify trace element concentrations. The rhyolitic dike is Oligocene in age (ca. 30.7 Ma), and our results indicate additional work is needed to refine the chronology of the Bullion Canyon Volcanics which are cut by the dike. Our magmatic-steam alunite and sericite results indicate there where two spatially and temporally distinct periods of episodic magmatic hydrothermal activity in the Miocene from ca. 15.7–15.1 Ma and from ca. 14.7–13.8 Ma. These results refine the chronology of hydrothermal activity associated with concealed porphyry stocks, and demonstrates the utility of high precision geochronology as an exploration tool for locating and characterizing deeply concealed porphyry systems.

Samples of vein-type magmatic-steam alunite were collected over several field seasons from five mines and prospects (L&N, Mt. Edna, Christmas, upper Mineral Products, and Close In) in the Alunite Ridge and Deer Trail Mountain area, Marysvale, Utah, as well as a sample from the Deer Trail mine workings from which sericite was separated. The magmatic-steam alunite and sericite were analyzed by the 40Ar/39Ar method to constrain the timing and duration of magmatic activity associated with the intrusion of two porphyry stocks beneath Alunite Ridge and Deer Trail Mountain. In addition, a sample of a highly altered rhyolitic quartz porphyry dike was collected from the upper Mineral Products mine, from which zircons were separated and analyzed using a sensitive high resolution ion microprobe reverse geometry (SHRIMP-RG) to determine a U/Pb date and quantify trace element concentrations. The rhyolitic dike is Oligocene in age (ca. 30.7 Ma), and our results indicate additional work is needed to refine the chronology of the Bullion Canyon Volcanics which are cut by the dike. Our magmatic-steam alunite and sericite results indicate there where two spatially and temporally distinct periods of episodic magmatic hydrothermal activity in the Miocene from ca. 15.7–15.1 Ma and from ca. 14.7–13.8 Ma. These results refine the chronology of hydrothermal activity associated with concealed porphyry stocks, and demonstrates the utility of high precision geochronology as an exploration tool for locating and characterizing deeply concealed porphyry systems.