aShirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, 117997 Russia
bAtlantic Branch, Shirshov Institute of Oceanology, Russian Academy of Sciences, Kaliningrad, 236022 Russia
cDepartment of Geology, Moscow State University, Moscow, 119991 Russia
Correspondence to: *e-mail: e_v_ivanova@ocean.ru
Received 21 December, 2015
DOI: 10.1134/S0001437016060035