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Home » Archive of journals » Issue 3(23) 2016 » Ferromanganese crusts of Mendeleev Swell: the features of composition and formation

FERROMANGANESE CRUSTS OF MENDELEEV SWELL: THE FEATURES OF COMPOSITION AND FORMATION

JOURNAL: 2016, №3(23), p. 16-28

HEADING: Research activities in the Arctic

AUTHORS: Konstantinova N.P., Cherkashev G.G., Novikov G.V., Bogdanova O.Y., Kuznetsov V.Y., Rekant P.V., Mirão J.A., Dias L.C., Madureira P.P.

ORGANIZATIONS: P. P. Shirshov Institute of Oceanology of the Russian Academy of Sciences, A.P. Karpinsky Russian Geological Research Institute, St Petersburg University, I. S. Gramberg All-Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean, Evora University, Estrutura de Missão para a Extensão da Plataforma Continental

UDC: 552.124.4

Keywords: rare metals, ferromanganese crusts, Mendeleev swell, rare earth elements, ore minerals of manganese and iron

Bibliographic description: Konstantinova N.P., Cherkashev G.G., Novikov G.V., Bogdanova O.Y., Kuznetsov V.Y., Rekant P.V., Mirão J.A., Dias L.C., Madureira P.P. Ferromanganese crusts of Mendeleev Swell: the features of composition and formation. Arctic: ecology and economy, 2016, no. 3(23), pp. 16-28. DOI: . (In Russian).


Abstract:

The materials for the study are based on the samples obtained during the Russian expedition «Arktika-2012» by dredging the southern part of the Mendeleev Swell. The material composition of ferromanganese crusts was studied, and their age was determined by the technique of excess 230Th. There are three layers diff ering in color and thickness in the section of the crusts. Vernadite, ferroksigit, birnessite, goethite and todorokite have been found among the Mn and Fe minerals. Comparison of the average contents of Mn, Ni, and Co samples with cobalt-rich crusts of the Magellan Mountains indicates their depletion of these elements. At the same time, the maximum content of Co and Ni in the upper crusts is comparable to their content in the crusts of the Atlantic and Indian Oceans. The crusts of the Mendeleev Swell are characterized by a high content of Sc, As, Li, Th and V. Crusts composition is characterized by several major phases: manganese oxides, hydroxides ferrous and non-metallic clay and clastic minerals. Content of identifi ed phases varies from layer to layer. Two main factors dominated in forming crust: deposition of ferromanganese bulk from the water column (with a substantial additional supply of hydrothermal substances in the early stages of their formation) and local impulses of ingress of terrigenous material.


Finance info: Работа поддержана грантами 3.37.135.2014 и 18.37.141.2014 Санкт-Петербургского государственного университета, а также совместной стипендиальной программой Санкт-Петербургского государственного университета и Банка Сантандер

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DOI 10.25283/2223-4594