Grain Size Properties of Surface Bottom Sediments from Chaun Bay

Based on the results of an analysis of 174 samples of bottom sediments collected at 48 stations in the Chaun Bay during the cruise 60 of the R/V Akademik Oparin (October 2020), it was found that their grain size distribution varies from poorly sorted silty clay to well sorted sand. The results of th...

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Bibliographic Details
Published in:Oceanology (Washington. 1965) 2024-06, Vol.64 (3), p.446-461
Main Authors: Ulyantsev, A. S., Streltsova, E. A., Charkin, A. N.
Format: Article
Language:English
Subjects:
Abrasion
Bottom sediments
Bottom topography
Climate change
Climate effects
Coastal zone
Cruises
Earth and Environmental Science
Earth Sciences
Eolian transport
Grain size
Grain size distribution
Holocene
Ice rafting
Marine Geology
Oceanography
Particle size
Rafting
River discharge
River flow
Runoff
Sediment
Sediment samples
Sediments
Size distribution
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Summary:Based on the results of an analysis of 174 samples of bottom sediments collected at 48 stations in the Chaun Bay during the cruise 60 of the R/V Akademik Oparin (October 2020), it was found that their grain size distribution varies from poorly sorted silty clay to well sorted sand. The results of the study led to conclusion that the main sedimentation mechanisms in Chaun Bay are thermal abrasion, river runoff, and abrasion, as well as ice rafting and aeolian transport. The zoning of grain size types of bottom sediments is related to the bottom topography and consistent with areas affected by riverine runoff, abrasion, and thermal coastal abrasion, as well as with the direction of currents. The high occurrence of coarse clastic matter in sediments is evidence of abrasion of the coastal zone and active ice rafting of large (up to 15 cm) rock fragments. The vertical variability of the grain size parameters of the studied bottom sediments within the upper 20 cm layer reflects gradual Late Holocene intensification of terrigenous (fluvial and thermal abrasion) fluxes with the current effects of climate change in the Arctic.
ISSN:0001-4370
1531-8508
DOI:10.1134/S0001437024700115