Enviar artigo por via de e-mail Lithological and mineralogical characteristic of the bottom sediments in the areas of ice scouring in the south-western Kara Sea
- Autores: Sukhikh E.A.1, Kokin O.V.1, Roslyakov A.G.2,3, Ananiev R.A.2, Arkhipov V.V.1
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Afiliações:
- Geological Institute of the RAS
- Shirshov Institute of Oceanology of the RAS
- Moscow State University
- Edição: Nº 2 (2024)
- Páginas: 143-162
- Seção: Articles
- URL: https://journal-vniispk.ru/0024-497X/article/view/259015
- DOI: https://doi.org/10.31857/S0024497X24020017
- EDN: https://elibrary.ru/zcdjzk
- ID: 259015
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Resumo
Sedimentary material sampled in the western Kara Sea both directly in the ice scours and on the background surfaces not disturbed by ice scouring has been studied. Based on the results of research of the physical properties and lithological and mineralogical features of bottom sediments in the ice scours, the bedding depth of the ice gouging impact boundary (ploughing contact) was identified. According to X-ray diffraction analysis of the <0.001 mm fraction, in the samples obtained below this boundary, in contrast to the overlying samples, chlorite has non-heat-resistant structure, which, together with the results of microscopic studies in thin sections, indicates its neoformation. The presence of secondary chlorite in near-surface conditions may be an indicator of the glaciodynamic impact (pressure) of iceberg keels on bottom sediments. The microstructures of the ice scour sediments differ both on the different polygons of the study area and within the same scour, depending on the location of the sampling point on the transverse profile of the morphosculpture.
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Sobre autores
E. Sukhikh
Geological Institute of the RAS
Email: sukhikh_ea@mail.ru
Rússia, Moscow
O. Kokin
Geological Institute of the RAS
Email: sukhikh_ea@mail.ru
Rússia, Moscow
A. Roslyakov
Shirshov Institute of Oceanology of the RAS; Moscow State University
Autor responsável pela correspondência
Email: sukhikh_ea@mail.ru
Rússia, Moscow; Moscow
R. Ananiev
Shirshov Institute of Oceanology of the RAS
Email: sukhikh_ea@mail.ru
Rússia, Moscow
V. Arkhipov
Geological Institute of the RAS
Email: sukhikh_ea@mail.ru
Rússia, Moscow
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Fig. 1. Route of the 51st cruise of the R/V Academician Boris Petrov and the position of the sampling stations considered in the article. The relief is shown according to the IBCAO version 3 data. Yellow squares are the positions of detailed bathymetric survey polygons presented in Fig. 2a (1) and 2c (2)
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Fig. 2. Bottom topography in the area of sampling stations in the Baidarata Bay (a) and in the East Novaya Zemlya Trough (c). Position of sampling stations on the cross-sectional profile through ice-excavation furrows (b, d)
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Fig. 3. Lithologic columns sampled in exaratation furrows (5115, 5116, 5120, 5122) and on the background surface (5123, 5124, 5126). Structure: 1 - silty clayey silt, 2 - clayey silt, 3 - clayey silty loam, 4 - sand, 5 - coarse clastic material, 6 - boundary between pre- and post-exaratation sediments in ice-exaratation furrows (exaratation contact). Texture: 1 - homogeneous, 2 - banded. Analyzed material in the sampling interval: 1 - schlich, 2 - schlip, 3 - clay fraction (<0.001 mm), 4 - shear strength measurement points (unit - kPa). Color columns schematically represent the color of bottom sediments
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Fig. 4. Iron-bearing mineral aggregates in different intervals of column 5124 in the >0.25 mm fraction: 105-110 cm (1), 117-122 cm (2), 147-152 (3) under binoculars. a-f - scanning electron microscopy of individual grains from the corresponding intervals. The data on the atomic percentage content of elements in the scanning points, indicated in red font in the photographs, are presented in Table 2. For notation of the structures, see Fig. 3
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Fig. 5. Micromorphology of sediment samples collected in the axial (column 5115) and instrumental (column 5116) parts of the ice-excavation furrow in Baidarata Bay. Intervals for petrographic sections, column 5115: 1 - 49-52 cm, 2 - 77-79 cm, 3 - 86-90 cm; column 5116: 4 - 57-62 cm, 5 - 73-77 cm, 6 - 98-100 cm. The following structural-textural features are marked by color: red dotted line - line of orientation of linear arrangement of mineral grains, orange dotted line - line of arc-shaped orientation of mineral grains, yellow - circular orientation of mineral grains (rotational structure), blue - lenses of coarse-grained sandy material, black - zones of staining with fine-dispersed organic matter. Arrows indicate microfracture discontinuities
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Fig. 6. Microhatching phenomenon in sample 5124_198: petrographic slip, transmitted light with analyzer (a) and without analyzer (b), reflected light, squares 1, 2, 3 (c); in sample 5126_86: petrographic slip, transmitted light with analyzer (d, f) and without analyzer (e, g, h); f, g - enlarged fragment of the selected area
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Fig. 7. X-ray diffractometric express imaging data of fine preparations in three states: I - air-dry (natural), II - saturated with ethylene glycol, III - calcined at T = 550°C. Line color: red - preparations are made of material at the bottom of the column with high shear strength, green - material at the top of the column with low shear strength, violet - material from areas with pronounced microhatching. The black arrow indicates the absence of chlorite peak on ignition in samples below the boundary of the supposed exaratation in columns from exaratation furrows (5122, 5116). 5124, 5126 are background columns. The black arrow for column 5126 marks the appearance of smectite peak at ethylene glycol saturation in the lower samples and its absence in the upper one
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Fig. 8. Samples 5122_127 and 5122_137 taken in the vicinity of the exaratation contact. Sample 5122_127 (above the contact), petrographic slip, transmitted light with analyzer (a, c) and without analyzer (b, d); c, d - magnification of the highlighted fragment in Fig. 8a. Sample 5122_137 (below the contact), petrographic slit, transmitted light with analyzer (e, g) and without analyzer (f, h); g, h - enlarged fragment at the boundary of zones with different dimensionality and orientation of clastic grains, indicated in Fig. 8e by number 1. Cl - chlorite, Qu - quartz, Gl - glauconite
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