Holocene Sedimentation History in the Southern Novaya Zemlya Trench |
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| Authors: | M A Levitan N A Belyaev M V Burtman J-C Duplessy T A Khusid |
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| Institution: | (1) Russian Academy of Sciences, Vernadsky Institute of Geochemistry and Analytical Chemistry, ul. Kosygina 19, Moscow, 119991, Russia;(2) Russian Academy of Sciences, Shirshov Institute of Oceanology, Nakhimovskii pr. 36, Moscow, 117997, Russia;(3) Laboratoire des Sciences du Climat et de l'Environnement, Laboratoire mixte CNRS-CEA, Parc du CNRS, 91198 Gif-sur-Yvette Cedex, France |
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| Abstract: | It is shown that sediments accumulated in the Southern Novaya Zemlya Trench at both deglaciation and marine stages. Permanent sea ice sheet existed during the deglaciation, and glacier meltwater was intensely delivered to the bottom layer. Along with the dominant sediment supply from the Southern Island of Novaya Zemlya, southern continental sources also played a noticeable role at that stage. Seasonal sea ice freezing led to the formation of cold brines at the marine stage. Like paleoproductivity, these processes were irregular. Dissolution of calcareous benthic foraminiferal tests considerably intensified after about 7 ka BP owing to a stronger Atlantic water advection into the Western Arctic and consequent increase in paleoproductivity, whereas the relative role of southern sedimentary provenances decreased. Sedimentation rates were constant (45 cm/ka) during the entire marine stage. |
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