Christopher S Holm-Denoma

U-Pb zircon data for: Cretaceous plutonic rocks of western Glacier Bay National Park and Preserve

In 2016, with National Park Service support, several previously undated plutons were sampled in Glacier Bay National Park and Preserve along the west side of Glacier Bay for age determinations. Geochronologic analyses were conducted to determine the ages of the plutonic rocks in the Glacier Bay area. Five samples were collected by Frederic Wilson (USGS Alaska Science Center), from Dundas Bay and Geikie Inlet, and dated by laser ablation-inductively coupled plasma mass spectrometry U-Pb methods. The dates obtained ranged from approximately 112-118 Ma, indicating that these samples are younger than the Saint Elias plutonic suite (ca. 160 Ma-130Ma), which runs along the same trend as the sampled rocks to the south.

Categories: Data; Tags: Alaska, Alaska Science Center, Detrital Zircon, Dundas Bay, GGGSC, All tags... Geikie Inlet, Geochronology, Geology, Geophysics, and Geochemistry Science Center, Glacier Bay, Glacier Bay National Park, Glacier Bay National Preserve, LA-ICPMS, Laser-Ablation Indictively-Coupled Plasma Mass Spectrometry, MRP, Microbeam Laboratory, Mineral Resources, Mineral Resources Program, Plutonic Rocks, Radiometric Dating, SEM-cathodoluminescence, Saint Elias plutonic suite, Th, Thorium, U-Pb, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), Uranium, Uranium-lead analysis, Fewer tags

U-Pb zircon data for volcanic and sedimentary units within the Kittitas Valley, central Washington State

This data release includes laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) U-Pb zircon geochronology data from four samples collected from syn- and post-Columbia River Basalt Group strata. Samples were collected from within alluvial fan strata and gravel-mantled hillslopes. Sample 16MANC2-01 was collected from an excavation into rounded fluvial gravel deposits along the Manastash Ridge. The unit collected includes Cascadian derived volcanic clasts and is interpreted as an inset terrace of fluvial strata deposited on the Manastash Ridge. Sample 16MANC1-06 is a rhyodacitic boulder collected on a nearby exposure of gravel mantled hillslopes along Manastash Ridge. Sample 16MRF01 was collected...

Categories: Data; Tags: Detrital Zircon, GGGSC, Geochronology, Geology, Geophysics, and Geochemistry Science Center, Kittitas Valley, All tags... LA-ICPMS, Laser-Ablation Inductively-Coupled Plasma Mass Spectrometry, MRP, Manastash Ridge, Microbeam Laboratory, Mineral Resources Program, Radiometric Dating, SEM-cathodoluminescence, Sedimentary Rocks, Sedimentology, Stratigraphy, Thorium, U-Pb, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), Uranium, Uranium-Lead analysis, Washington, Yakima River, Fewer tags

U-Pb detrital zircon data for: lower Paleozoic sedimentary rocks near Silverton, CO USA

This Laser ablation ICPMS U-Pb detrital zircon data set supports mapping and stratigraphic interpretations of the Upper Devonian Ignacio Formation in southwestern Colorado (Silverton area). All samples were collected from a measured stratigraphic section called "Sultan Creek South" located at 37.710010 and -107.67530 (Evans and others, 2019). The Ignacio Formation was previously interpreted as Cambrian, but evidence that it is Devonian includes reexamined fossil data and detrital zircon U-Pb geochronology. The Ignacio Formation has a stratigraphic trend of detrital zircon ages shifting from a single ca. 1.7 Ga age peak to bimodal ca. 1.4 Ga and ca. 1.7 Ga age peaks, which represents local source-area unroofing history....

Categories: Data; Tags: Colorado, Detrital Zircon, East Lime Creek Conglomerate, GGG, Geochronology, All tags... Geology, Geophysics, and Geochemistry Science Center, Ignacio Formation, LA-ICPMS, Laser-Ablation Inductively-Coupled Mass Spectrometry, Microbeam Laboratory, Radiometric Dating, SEM-cathodoluminescence, San Juan Mountains, Silverton, Stratigraphy, Stratigraphy, Sultan Creek, Th, Thorium, U-Pb, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), Uranium-Lead, Fewer tags

U-Pb detrital zircon geochronology of cores and cuttings from selected wells in Arctic Alaska

Select samples were collected from boreholes in Arctic Alaska to determine the U-Pb ages of zircon to determine a maximum depositional age of the geologic units and/or provenance of the zircon in the samples. Samples were collected from the Department of Natural Resources-Alaska Geologic Materials Center in Anchorage Alaska and sent to U.S. Geological Survey-Geology, Geophysics and Geochemistry Science Center, Denver, CO for mineral separation and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) U-Pb geochronology analyses. The information is this report includes LA-ICPMS analyses conducted between 2016 and 2018 of at least 120 zircon grains or more (if recovered from sample) from twenty samples...

Categories: Data; Tags: Alaska, Arctic, Basement, Chukchi Sea, Core, All tags... Cuttings, Detrital Zircon, Echooka Formation, Economic Geology, Endicott Group, GGG, Geochemistry, Geochronology, Geology, Geophysics, and Geochemistry Science Center, Kingak Shale, Kugrua Sandstone, Kuparuk Formation, LA-ICPMS, Laser-Ablation Inductively-Coupled Plasma Mass Spectrometry, Ledge Sandstone, Lisburne Group, Mineral Resources, Radiometric Dating, Sag River Sandstone, Simpson Sandstone, U-Pb, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), Uranium-Lead, Fewer tags

Data to accompany U.S. Geological Survey Data Series 1099: Petrographic, geochemical and geochronologic data for Cenozoic volcanic rocks of the Tonopah, Divide, and Goldfield Mining Districts, Nevada

This dataset is the assembled analytical results of geochemical, petrographic, and geochronologic data for samples, principally those of unmineralized Tertiary volcanic rocks, from the Tonopah, Divide, and Goldfield mining districts of west-central Nevada. Much of the data presented here for the Tonopah and Divide districts are for samples collected by Bonham and Garside (1979) during geologic mapping in and around those districts, whereas much of that for samples from the Goldfield district were obtained by Ashley (1974; 1979; 1990). Additional data were derived from samples collected between 2012–2017, as part of the U.S. Geological Survey Mineral Resources Program funded project titled: “Magmatic-tectonic history...

Categories: Data; Tags: Ar, Divide mining district, Economic Geology, Esmeralda County, Fraction Tuff, All tags... GGGSC, Geochemistry, Geology, Geophysics, and Geochemistry Science Center, Goldfield mining district, Heller Tuff, ICP–AES, ICP–MS, LA-ICPMS, MRP, Mineral Resources, Mineral Resources Program, Nevada, New Mexico Geochronology Research Center, Nye County, Pb, SHRIMP-RG, Sensitive High Resolution Ion Microprobe with Reverse-Geometry, Siebert Tuff, Tonopah mining district, U, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), Walker Lane geologic province, argon, geochemistry, geochronology, geoscientificInformation, inductively coupled plasma—atomic emission spectrometry, inductively coupled plasma—mass spectrometry, laser ablation inductively coupled plasma—mass spectrometry, lead, petrography, precious metal deposits, uranium, volcanic rocks, wavelength dispersive X-ray fluorescence spectrometry, Fewer tags