Content and composition of rock debris at the Lomonosov Ridge (83° N): indication of palaeoenvironmental changes

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The results of studying the quantitative, material, and morphometric composition of rock debris in sediments sampled by a box-corer on the Lomonosov Ridge (83° N), Arctic Ocean, during the Severny Polyus 41 expedition (AARI) are presented. Debris ≥1 cm was sampled from each lithological layer according to the description. The age model was created by lithostratigraphic correlation with previously dated cores. The content of debris on the eastern slope and the summit is significantly higher than on the western slope, which is explained by the higher sedimentation rate on the western slope after the deglaciation peak. The carbonate to igneous shift in rock composition and the increase in roundness with time indicate a higher input of Eurasian material in MIS 1.

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作者简介

Е. Popova

The All-Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean (“VNIIOkeangeologia”); Arctic and Antarctic Research Institute (AARI)

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Email: lena-popova-l@mail.ru
俄罗斯联邦, Saint Petersburg; Saint Petersburg

V. Bogin

The All-Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean (“VNIIOkeangeologia”); Arctic and Antarctic Research Institute (AARI)

Email: lena-popova-l@mail.ru
俄罗斯联邦, Saint Petersburg; Saint Petersburg

S. Malyshev

The All-Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean (“VNIIOkeangeologia”); Arctic and Antarctic Research Institute (AARI)

Email: lena-popova-l@mail.ru
俄罗斯联邦, Saint Petersburg; Saint Petersburg

К. Filchuk

Arctic and Antarctic Research Institute (AARI)

Email: lena-popova-l@mail.ru
俄罗斯联邦, Saint Petersburg

А. Makarov

Arctic and Antarctic Research Institute (AARI)

Email: lena-popova-l@mail.ru
俄罗斯联邦, Saint Petersburg

V. Kaminsky

The All-Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean (“VNIIOkeangeologia”)

Email: lena-popova-l@mail.ru

Academician of the RAS

俄罗斯联邦, Saint Petersburg

参考

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2. Fig. 1. Layout of geological stations.

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3. Fig. 2. Schematic lithological structure of sections, depth of material sampling and content of fragments in the volume of the box corer. The pink dotted line shows the supposed boundaries of the MIS.

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4. Fig. 3. Variation in the number, size and shape of fragments depending on the layer: the number and content of fragments in the volume of each layer, the average roundness according to Wadell and three dimensions (length, width and height): the solid line shows the average for the layer, the dotted line shows the limits of the confidence interval for 95%. On the left is the number of fragments in each layer (sum). Layers are shown without a vertical scale.

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5. Fig. 4. Change in the content of the composition of fragments depending on the layer (cumulative % by layer).

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6. Fig. 5. Correlation of core 23T with core PS87/079-1 [13] by lithological characteristics and magnetic susceptibility, the boundaries between MIS are shown by pink lines. The horizontal hatching shows siltstone, dots – sediments with increased sand content, horizontal stripes – layered texture.

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