Sedimentary infill in the equatorial Mid-Oceanic Canyon,Atlantic Ocean |
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| Authors: | N V Simagin I O Murdmaa E A Seitkalieva D G Borisov E V Dorokhova E M Emel’yanov O V Levchenko |
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| Institution: | 1.Shirshov Institute of Oceanology,Russian Academy of Sciences,Moscow,Russia;2.Faculty of Geology,Moscow State University,Moscow,Russia;3.Atlantic Branch, Shirshov Institute of Oceanology,Russian Academy of Sciences,Kaliningrad,Russia;4.Baltic State University,Kaliningrad,Russia |
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| Abstract: | Facts confirming the hypothesis of contourite sediment infill of the Equatorial Mid-Ocean Canyon (EMOC) are presented. We examined two cores recovered in Cruises 37 and 43 of the R/V Akademik Ioffe (2012, 2013). The cores recovered upper Quaternary miopelagic clays on the EMOC floor (AI-3149) and the adjacent abyssal plain (AI-2620). The study of these cores unraveled significant differences in their composition. In contrast to the lithologically homogeneous Core AI-2620, Core AI-3149 includes interlayers enriched in the biogenic CaCO3, terrigenous silt, and authigenic ferromanganese micronodules. These peculiarities are attributed to activity of the Antarctic Bottom Water (AABW) contour currents along the EMOC. |
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