Cryptotephra of Lake Khorlakel (Northern Caucasus, Russia)


  • Mazneva, E.A. 1
  • Aleksandrin, M.Yu. 1
  • Konstantinov, E.A. 1
  • Ponomareva, V.V. 2
  • Portnyagin, M.V. 3
  • Borisov, D.G. 4
  • 1 Institute of Geography Russian Academy of Sciences, Staromonetny lane, 29, build. 4, Moscow, 119017, Russia
    2 Institute of Volcanology and Seismology, Far East Branch of the Russian Academy of Sciences, Piip boulevard, 9, Petropavlovsk- Kamchatsky, 683006, Russia
    3 GEOMAR Helmholtz Center for Ocean Research Kiel, Building 4, East shore campus, Wischhofstr. 1-3, D-24148 Kiel, Germany
    4 Shirshov Institute of Oceanology of Russian Academy of Sciences, Nakhimovskiy prospect, 36, Moscow, 117997, Russia



tephra, tephrochronology, cryptotephra, Lake Khorlakel, volcanic ash


A tephrochronological study of the core HOR-1 of bottom sediment from Lake Khorlakel, located 24 km northwest of the Elbrus summit, was carried out. The core was 253 cm length. Deposits are represented by interbedding of thin-layered loams and bio-mineral silt. Six intervals of increased content of cryptotephra from 37,000 to 111,000 shards g dry weight −1 were identified. For a prominent peak of cryptotephra concentration in 214-215 cm, which is hardly noticeable as a whitish layer in the core, a geochemical relationship has been established with the proximal tephra of the Elbrus volcano. The age of this peak is estimated at 5950-6250 cal. yr BP.