New U-Pb Geochronology and Geochemistry of Paleozoic Metaigneous Rocks from Western Yukon and Eastern Alaska
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 ± 3.8 to 253.1 ± 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).
Resources
| Name |
Format |
Description |
Link |
|
55 |
Landing page for access to the data |
https://doi.org/10.5066/P93ZWGA1 |
|
55 |
The metadata original format |
https://data.usgs.gov/datacatalog/metadata/USGS.ASC548.xml |
Tags
- alaska
- isotopic-analysis
- eagle
- geochronology
- trace-elements
- uranium-thorium-analysis
- isotopes
- age-determinations
- usgs-asc548
- big-delta
- radioactive-elements
- whole-rock-geochemistry
- geology
- fairbanks
- tanacross
- geoscientificinformation
- geochemistry
- radiometric-dating
- uranium-lead-analysis
- igneous-rocks
- minor-elements
- major-elements
- yukon
- metamorphic-rocks