Tectonic significance of precambrian apatite fission-track ages from the midcontinent United States

@inproceedings{Crowley1986TectonicSO,
  title={Tectonic significance of precambrian apatite fission-track ages from the midcontinent United States},
  author={Kevin D. Crowley and Charles W. Naeser and Carol Ann Babel},
  year={1986}
}
Abstract Apparent apatite fission-track ages from drill core penetrating basement on the flank of the Transcontinental Arch in northwestern Iowa range from 934 ± 86 to 641 ± 90 Ma. These ages, the oldest reported in North America, record at least two thermal events. The 934 Ma age, which is synchronous with K-Ar ages in the Grenville Province and many K-Ar whole-rock and Rb-Sr isochron ages from the Lake Superior region, may document basement cooling caused by regional uplift and erosion of the… CONTINUE READING