Geologist
Geology, Geophysics, and Geochemistry Science Center
Email:
lpianowski@usgs.gov
Office Phone:
303-236-5454
ORCID:
0000-0002-5346-8251
Location
Building 95
P.O. Box 25046
Denver Federal Center
Lakewood
, CO
80225-0585
US
Supervisor:
Erin Marsh
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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
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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
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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
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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
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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.
Categories: Data;
Tags: Challis,
GGGSC,
Geochronology,
Geology, Geophysics, and Geochemistry Science Center,
Idaho, All tags...
Igneous Rocks,
Igneous Zircon,
LA-ICPMS,
Laser-Ablation Inductively-Coupled Plasma Mass Spectrometry,
MRP,
Microbeam Laboratory,
Mineral Resources Program,
Radiometric Dating,
SEM-cathodoluminescence,
Stibnite,
Th,
Thorium,
Thunder Mountain,
U-Pb,
U.S. Geological Survey,
USGS,
USGS Science Data Catalog (SDC),
Uranium,
Uranium-Lead analysis,
Yellow Pine,
["Mineral Resources"], Fewer tags
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