Dating of the Sedimentary Cover Reflectors and Evaluation of the Sedimentation Rates in the Late Pliocene–Quaternary in the King Trough and Vicinity (The North Atlantic)

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Abstract

Based on the results of the 55th and 57th cruises of the R/V “Akademik Nikolai Strakhov”, seismoacoustic profiling data of the upper part of the sedimentary cover were obtained in the area of the King Trough mesostructural complex (eastern flank of the MAR). Reference reflectors were identified from the seismoacoustic sections and correlated with the DSDP 608 and IODP U1312 deep-sea drilling holes. The sections cover the entire Quaternary sediment record (glacial cycles) and part of the Upper Pliocene sediment record. As a result of the work, sedimentation rates within the different structures of the King Trough were calculated. During the last 1.5 Ma, sedimentation rates have been slightly different throughout the area from average sedimentation rates in the World Ocean, whereas earlier rates were several times higher than average ones. There is a period of sharply increased sedimentation rates (up to 180 m/My) at ca. 1.5 Ma, which may be related to abrupt climatic changes and ocean level fluctuations. Prior to the onset of the Mid-Pleistocene Transition at 1.5 Ma, a bottom current probably ran along the bottom of the western part of the King Trough, causing high sedimentation rates in the bottom of the trough. The current stopped after the onset of the climatic transition, which could be due to regional restructuring of the Atlantic Meridional Overturning Circulation. These conclusions are correlated with sedimentation rates and changes in ocean surface temperature based on data from IODP U1313.

About the authors

V. A. Bogoliubskii

Geological Institute Russian Academy of Sciences; Lomonosov Moscow State University, Faculty of Geology; The Earth Science Museum, Lomonosov Moscow State University

Email: bogolubskiyv@yandex.ru
Moscow, Russia; Moscow, Russia; Moscow, Russia

S. Y. Sokolov

Geological Institute Russian Academy of Sciences

Moscow, Russia

A. P. Denisova

Geological Institute Russian Academy of Sciences

Moscow, Russia

K. O. Dobroliubova

Geological Institute Russian Academy of Sciences

Moscow, Russia

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