Zircon U-Pb and 40Ar/39Ar results from dikes collected within the Bruin Bay fault zone, lower Cook Inlet

Description

This data release presents zircon U-Pb LA-ICP-MS geochronology from igneous rocks exposed in a coastal exposure at Ursus Head, Iliamna C-2 Quadrangle. Sills and dikes exposed in a coastal exposure at Ursus Head are deformed within the Bruin Bay fault zone. Common dikes intruding late Triassic Kamishak Formation strata composing the hanging-wall of the Bruin Bay fault are cut by numerous small-scale, low-angle, bedding-parallel, and high angle contractional faults. Sample 09MAW006A collected from one of many dikes deformed in the fault zone produced a uni-modal distribution of zircon ages of with a weighted mean of 206.92 +/-0.96 (2 sigma, n=47) and an MSWD of 1.1. Sample 09BG020C collected from a sill of more mafic composition yielded few zircons and produced only eight ages with a weighted mean of 212.49 +/-2.28 (2 sigma) and an MSWD of 3.42. The accompanying report also presents 40Ar/39Ar geochronology results from rocks collected roughly 7 km southwest of Contact Point, Iliamna B-3 Quadrangle.

Resources

Name Format Description Link
0 CSDGM IMPORT ERROR: No digtinfo/formcont http://doi.org/10.14509/29750
0 http://doi.org/10.14509/29750
0 http://doi.org/10.14509/29130
0 http://doi.org/10.14509/29457
0 http://doi.org/10.14509/29544
0 http://doi.org/10.14509/23403
0 http://doi.org/10.14509/24850

Tags

  • cenozoic
  • iliamna quadrangle
  • zircon
  • methods
  • tectonics
  • 40ar/39ar
  • mesozoic
  • rocks
  • sample location
  • geochronology
  • stratigraphy
  • structural geology
  • isotopes
  • structure
  • uranium
  • geologic
  • analyses
  • lead
  • eocene
  • volcanic
  • bedrock
  • geology
  • bedrock geology
  • cook inlet basin
  • ar-ar
  • naknek
  • cook inlet
  • analyses and sampling
  • fault displacement
  • plagioclase
  • contact point
  • u-pb
  • ursus head
  • oligocene
  • lab methods
  • age dates
  • volcanic rocks
  • analytical results
  • bruin bay fault
  • igneous
  • triassic
  • analytical lab results

Topics

  • Local Government

Categories