Erten, H. N.2016-02-082016-02-0819970033-4545http://hdl.handle.net/11693/25687Sediment cores from Lakes Zurich, Constance, from the Sea of Marmara and from southern Turkey, northern Cyprus and eastern Spain were dated using natural 210Pb, fallout 137Cs and cosmic-ray produced 7Be radionuclides. Constant activity regions in the uppermost sections of sediments from Lake Zurich and the Sea of Marmara were attributed to post-depositional mobility of 210Pb in the former case and to bioturbation in the latter. A serious discrepancy exists between the 210Pb dating of Sea of Marmara sediments and those obtained by organic carbon based methods. The elements Zn, Cu, P and Pb were enriched in the upper sections of the sediment cores corresponding to the last 200 years. The increased metallurgical activities as a result of reforms in the Ottoman Army during the 18 th century could be the most likely cause.EnglishArticle10.1351/pac199769010071