Skip to main content
  1. ScienceBase Catalog
  2. Alaska Science Center (ASC)
  3. _Geology & Natural Hazards
  4. New U-Pb Geochronology and Geochemistry of Paleozoic Metaigneous Rocks from Western Yukon and Eastern Alaska

New U-Pb Geochronology and Geochemistry of Paleozoic Metaigneous Rocks from Western Yukon and Eastern Alaska

Dates

Publication Date
Start Date
1978
End Date
2007

Citation

Dusel-Bacon, C., Mortensen, J.K., 2023, New U-Pb geochronology and geochemistry of Paleozoic metaigneous rocks from western Yukon and eastern Alaska: U.S. Geological Survey data release, https://doi.org/10.5066/P93ZWGA1.

Summary

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 [...]

Contacts

Point of Contact :
Alaska Science Center
Originator :
Cynthia Dusel-Bacon, James K Mortensen
Metadata Contact :
Alaska Science Center
Publisher :
Alaska Science Center
Distributor :
USGS ScienceBase Team
SDC Data Owner :
Alaska Science Center
USGS Mission Area :
Energy and Minerals

Attached Files

Click on title to download individual files attached to this item.

geoChemChron_metaigneous_yukonTanana_dusel-bacon_metadata.xml
Original FGDC Metadata
View 		126.78 KB application/fgdc+xml
Supplemental_Information_Analytical_Methods_U-Pb_Geochronology.pdf 137.39 KB application/pdf
Supplemental_Information_Analytical_Methods_Whole-rock_Geochemistry.pdf 139.45 KB application/pdf
amphibolite_chemistry_yukonTanana.csv 6.82 KB text/csv
augen_gneiss_chemistry_yukonTanana.csv 3.76 KB text/csv
geoChemChron_metaigneous_yukonTanana_dusel-bacon_metadata.html 283.41 KB text/html
zircon_LA_ICPMS_yukonTanana.csv 5.54 KB text/csv
zircon_sample_summary_yukonTanana.csv 8.13 KB text/csv
zircon_titanite_geochemical_dataDictionary_yukonTanana.csv 23.48 KB text/csv
zircon_titanite_TIMS_yukonTanana.csv 30.91 KB text/csv

Purpose

The geochronology and geochemistry data in this data release were obtained to assess the genesis of igneous rocks in eastern Alaska and western Yukon to better understand their crystallization ages, tectonic relationships, correlations, environment of formation, and by inference their potential for mineral deposits. The U-Pb zircon and titanite age data set was developed from samples collected during geologic mapping and research conducted from 1989 to 2007 and funded by the U.S. Geological Survey (USGS) Branch of Alaskan Geology and Mineral Resource Program in Alaska, and grants to James K. Mortensen from the Natural Sciences and Engineering Research Council of Canada (NSERC)and University of British Columbia. Our U-Pb zircon data target igneous rocks from a variety of tectonic assemblages that span the Alaska–Yukon border whose origins and relationships have been debated. The whole-rock major and trace element data set of augen gneiss and amphibolite are from samples collected between 1978 and 1996 as part of the Alaska Mineral Resource Assessment program of the USGS. The majority of the geochemical data were previously published in journals (augen gneiss in Dusel-Bacon and Aleinikoff, 1985 GSA Bulletin; amphibolite in Dusel-Bacon and Cooper, 1999 Canadian Journal of Earth Sciences), in addition to some unpublished trace-element data generated at the University of Alaska, Fairbanks. We are including previously published data in the release to provide a complete, machine-readable, publicly available dataset that will be archived in perpetuity. This data release contains complete metadata for each sample, some of which was missing in the journal publications.

Map

Map Preview

Communities

  • Alaska Science Center (ASC)

Tags

Provenance

Data source
Input directly

Additional Information

Identifiers

Type Scheme Key
DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/P93ZWGA1

Item Actions

View Item as ...

JSON ATOM ISO XML

Save Item as ...

JSON FGDC MODS XML ISO XML

View Item...

Metrics