• Problems in Radiocarbon Dating of Soils

      Chichagova, O. A.; Cherkinsky, A. E. (Department of Geosciences, The University of Arizona, 1993-01-01)
      We discuss our progress in three principal applications of 14C dating of recent and fossil soils: 1) new methods; 2) problems of interpreting 14C soil data (e.g.,14C age of soils, age of soils, duration of humus formation, rate of carbon cycling); and 3) 14C analysis of soil organic matter (OM) in pedology and paleogeography (e.g., soil genesis and evolution, humus formation and OM metamorphosis, geochronology and stratigraphy of Late Pleistocene and Holocene sediments). We suggest exploring the above issues in the analysis of each 14C profile in conjunction with paleogeographical data, and by simulation of the carbon cycle in each type of profile.
    • Radiocarbon 1994 Price List

      Department of Geosciences, The University of Arizona, 1993-01-01
    • Radiocarbon and 11-Year Variations of Cosmic Rays

      Burchuladze, A. A.; Pagava, S. V.; Togonidze, G. I.; Avtandilashvili, M. V. (Department of Geosciences, The University of Arizona, 1993-01-01)
    • 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 Chronology of Early Medieval Archaeological Sites in Northwestern Russia

      Popov, S. G.; Svezhentsev, Yu S.; Zaitseva, G. I. (Department of Geosciences, The University of Arizona, 1993-01-01)
      A reliable archaelogical chronology for medieval sites in northwestern Russia depends in part on a refined regional calibration scale for 14C dates. We present results of dates on tree-ring series from Novgorod that show a systematic discrepancy from European calibration curves, and that underline the need for more extensive 14C dating as the basis of an extended calibration curve for the region.
    • Radiocarbon Chronology of Paleogeographic Events of the Late Pleistocene and Holocene in Russia

      Kaplin, P. A.; Svitoch, A. A.; Parunin, O. B. (Department of Geosciences, The University of Arizona, 1993-01-01)
      14C chronology of Late Pleistocene paleogeographical events in the Black Sea-Caspian Sea region shows that the following transgressions partly correlate with each other: Karangat and Khazarian; Neo-Euxinian and Khvalyn; Holocene and Neo-Caspian. The main climatic events were synchronous in intercontinental Siberia. In the far eastern region, the Middle-Wisconsinan transgression is reflected by Chukotka and western Kamchatka terraces and by submerged ancient shorelines in Primorye.
    • 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.
    • Radiocarbon Dating Organic Detritus: Implications for Studying Ice Sheet Dynamics

      Punning, Jaan-Mati; Rajamäe, Raivo (Department of Geosciences, The University of Arizona, 1993-01-01)
      We present here a description of the 14C dating method used at the Institute of Geology, Estonian Academy of Science. We discuss results of geochronological studies of several stratigraphic sections, from which we estimate the age of the Late Weichselian (Late Valdaian) glacial maximum. 14C and paleobotanical data indicate that biodetrital materials comprise organic debris from various sources and suggest only a maximum age of investigated strata (16,000 BP).
    • Radiocarbon Updates

      Department of Geosciences, The University of Arizona, 1993-01-01
    • Radiocarbon, Volume 35, Number 3 (1993)

      Department of Geosciences, The University of Arizona, 1993-01-01
    • Reconstruction of Caspian Sea-Level Fluctuations: Radiocarbon Dating Coastal and Bottom Deposits

      Karpytchev, Yu A. (Department of Geosciences, The University of Arizona, 1993-01-01)
      Owing to the large basin area of the Caspian Sea, fluctuations in its level reflect climatic changes in the northern hemisphere. To reconstruct these fluctuations, I collected mollusk shells, plant debris, carbonates and organic matter samples for 14C dating from deposits of ancient salt marshes, depressions and bars formed during significant sea-level decline. I studied the impact of eolian sedimentation via parallel dating of carbonates and other materials. The data demonstrate that sea level rises during periods of cooling and falls during warming periods; this is true for both long-term (2-2.5 ka) and short-term climatic changes.
    • The Reliability of Radiocarbon Dating Buried Soils

      Orlova, L. A.; Panychev, V. A. (Department of Geosciences, The University of Arizona, 1993-01-01)
      Variable 14C ages of paleosol organic matter (OM) cause difficulties in interpreting 14C data. We attempt to determine the reliability of OM 14C dates by examining different carbon-containing materials from soil horizons and paleosol fractions.