C/N and C13 patterns in lake sediments as a source of palaeoenvironmental information for the Mologa-Sheksna region (NW Russia)

  • Sadokov D.O. 1, 2
  • Knoblauch C. 3
  • Melles M. 4
  • Mantke N. 4
  • Lendt R. 3
  • 1 Darwin State Nature Biosphere Reserve, Pobedy Pr., 6, Cherepovets, 162606, Russia
    2 St. Petersburg State University, Universitetskaya Emb., 7/9, St. Petersburg, 199034, Russia
    3 Universitat Hamburg, Institute of Soil Science, Allende-Platz 2, Hamburg, 20146, Germany
    4 Universitat zu Koln, Institute of Geology and Mineralogy, Zulpicher Str., 49a, Koln, 50674, Germany
Keywords: lacustrine sedimentation, organic geochemistry, C/N ratios, C<sup>13</sup> signatures


Organic geochemical proxies (C13 and C/N) are used to infer changes of plant fossils sources in the sediments of relict mire lakes in Russia. The Pleistocene-Holocene transition is described by C13 and C/N used jointly. Shifts of C/N and C13 give ideas for the lakes water level and composition of plant remains changes as a consequence of the regional climate alterations. Pre-Holocene cool period (Younger Drias) and preceding warm phase (Allerd) are supposedly traced in the lake sediments for the north of the Mologa-Sheksna Lowland.