• Are the 14C Dates of the Dead Sea Scrolls Affected by Castor Oil Contamination?

      Carmi, Israel (Department of Geosciences, The University of Arizona, 2002-01-01)
      The paper "The effects of possible contamination on the radiocarbon dates of the Dead Sea Scrolls I: castor oil" by Rasmussen et al. (2001) is discussed. Detailed analysis of the extant dates of the Dead Sea Scrolls suggests that the pretreatment of the samples was adequate. Errors and omissions in the paper are discussed and the implications of the experiment of Rasmussen et al. (2001) are questioned.
    • Carbon Dynamics in Vertisols as Revealed by High-Resolution Sampling

      Becker, Heidmann Peter; Andresen, Olaf; Kalmar, Dov; Scharpenseel, Hans Wilhelm; Yaalon, Dan H. (Department of Geosciences, The University of Arizona, 2002-01-01)
      Two Vertisol soil profiles under xeric soil moisture regimes, located at Qedma and Akko, Israel, were investigated and compared to a profile under ustic moisture regime, located in Hyderabad, India. Samples were taken in complete successive 2 cm thin layers down to about 180 cm depth or more. Organic and inorganic carbon were analyzed with regard to 13C and 14C concentrations. While all soils have radiocarbon ages of several thousand years BP, the depth distributions reveal substantial differences between the soil carbon dynamics. 14C and, less pronounced, delta-13C clearly reflect the pedoturbation process. Further, its strength is found to be related to mainly soil moisture regime, then clay content and land use. In one soil, a change of growing from C4 to C3 crops in the past can be concluded from the delta-13C depth distribution.