• A Regional Geochronological Study of Late Pleistocene Permafrost

      Kostyukevich, V. V. (Department of Geosciences, The University of Arizona, 1993-01-01)
      The use of radiocarbon dating in geocryological investigations makes it possible to establish a chronology for permafrost-geological development during the Late Pleistocene. Both global and regional time scales for the formation of Late Pleistocene permafrost have been worked out over the past 15-20 years at the Permafrost Institute of the Siberian Branch of the Russian Academy of Sciences. I present here results from study areas of northwestern Siberia and of North, Central and West Yakutia.
    • Problems and Methods of Dating Low-Activity Samples by Liquid Scintillation Counting

      Arslanov, Kh A.; Tertychnaya, T. V.; Chernov, S. B. (Department of Geosciences, The University of Arizona, 1993-01-01)
      The important problem of contamination of old samples by younger 14C necessitates treatment of organic and carbonate samples to ensure more complete removal of contaminating carbon. Here we present studies of chemical procedures for the liquid scintillation method of 14C dating undertaken since 1960 in the former USSR. We discuss new procedures such as lithium carbide synthesis from charred organic samples and benzene synthesis on a V2O5.Al2O3.SiO2 catalyst, as well as memory effect in the carbide synthesis procedure and characteristics of two homemade counters.
    • Radiocarbon Chronology of Archaeological Sites of the Kurile Islands

      Zaitseva, G. I.; Popov, S. G.; Krylov, A. P.; Knorozov, Yu V.; Spevakovskiy, A. B. (Department of Geosciences, The University of Arizona, 1993-01-01)
    • Radiocarbon Dating and Tephrochronology in Kamchatka

      Braitseva, O. A.; Sulerzhitsky, L. D.; Litasova, S. N.; Melekestsev, I. V.; Ponomareva, V. V. (Department of Geosciences, The University of Arizona, 1993-01-01)
      We discuss results of 14C dates obtained from areas of young volcanoes in Kamchatka. We apply these dates to reconstructing regional volcanic activity during the Holocene.