• High-Resolution 14C Dating of Organic Deposits Using Natural Atmospheric 14C Variations

      Van Geel, Bas; Mook, Willem G. (Department of Geosciences, The University of Arizona, 1989-01-01)
      The occurrence of atmospheric 14C variations complicates calibration, ie, the translation of 14C ages into real calendar ages. The procedure of wiggle matching, however, allows very precise calibration, by matching known 14C variations with wiggles in the floating chronology. In principle, wiggle matching can also be applied to a series of 14C dates from organic (peat) deposits. Where, in general, 14C ages are required at short distances and on small samples, dating by 14C accelerator mass spectrometry (AMS) is required.
    • Temporal 10Be and 14C Variations: A Tool for Paleomagnetic Research

      Kocharov, G. E.; Blinov, A. V.; Konstantinov, A. N.; Levchenko, V. A. (Department of Geosciences, The University of Arizona, 1989-01-01)
      Temporal variations of cosmogenic radionuclide atmospheric concentrations can be caused by such global phenomena as solar activity and geomagnetic field changes as well as atmospheric circulation processes. These causes can be distinguished by the comparison of several isotope records corresponding to the same time period. We discuss a possibility for reconstructing the geomagnetic moment during the last 30,000 years from the comparison of 10Be and 14C concentrations in terrestrial archives. The results agree with conventional paleomagnetic data and promise to enrich our knowledge of geomagnetic field variations and reversals.