Zircon U-Pb age data, Alaska Highway Corridor, Tanacross and Nabesna quadrangles, Alaska

Description

Twenty-two igneous and metamorphic rock samples were collected in a 20-km-long swath centered on the Alaska Highway between Tetlin Junction, Alaska, and the Canada border. Igneous and metamorphic rock samples were submitted to the Apatite to Zircon, Inc. laboratory (A2Z), where zircon U-Pb age analysis, using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), was performed by Paul O'Sullivan. The 15 felsic plutonic rock samples and one gabbro sample yield Cretaceous zircon U-Pb weighted-mean ages ranging from 95.7 Ma to 106.2 Ma. Zircons from a metadiorite yield a Triassic weighted-mean age of about 241.9 Ma. Metamorphic zircons from two samples with felsic igneous protoliths yield Mississippian weighted-mean ages of 351.7 Ma and 354.6 Ma. Detrital zircons from two metaconglomerates yield individual grain ages from 100 Ma to 1,811 Ma, but are predominantly between 300 Ma and 345 Ma. Detrital zircons from a quartzite yield peaks at about 2,648 Ma, 1,946 Ma, and 1,807 Ma. Samples were analyzed for a variety of suites of major and trace elements depending on the sample type. The analytical data tables associated with this report are being released in digital format.

Resources

Name Format Description Link
0 http://dx.doi.org/10.14509/26861
0 http://dx.doi.org/10.14509/16021
0 http://dx.doi.org/10.14509/27201
0 http://dx.doi.org/10.14509/26841
0 CSDGM IMPORT ERROR: No digtinfo/formcont http://dx.doi.org/10.14509/27322
0 http://dx.doi.org/10.14509/27322

Tags

  • carboniferous
  • tanacross quadrangle
  • mississippian
  • geochronology
  • isotopes
  • bedrock
  • alaska highway corridor
  • geology
  • bedrock geology
  • detrital zircon
  • igneous rocks
  • analyses and sampling
  • nabesna quadrangle
  • u-pb
  • devonian
  • age dates
  • metamorphic rocks
  • triassic

Topics

  • Local Government

Categories