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Quaternary 2019, 2(1), 8; https://doi.org/10.3390/quat2010008

Grain-Size Distribution and Structural Characteristics of Varved Sediments from Lake Żabińskie (Northeastern Poland)

1
Faculty of Oceanography and Geography, University of Gdansk, 80-309 Gdansk, Poland
2
Faculty of Geography and Biology, Pedagogical University of Cracow, 30-084 Krakow, Poland
*
Author to whom correspondence should be addressed.
Received: 29 November 2018 / Revised: 29 January 2019 / Accepted: 2 February 2019 / Published: 4 February 2019
(This article belongs to the Special Issue Annually Laminated Lake Sediments)
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Abstract

Typically, the description of varve microfacies is based on microscopic sedimentary structures, while standard grain-size analysis is commonly applied with lower resolution. Studies involving a direct comparison of varve microfacies and particle-size distributions, common for clastic environments, are scarce for biogenic varves. In this study, we analyzed nine-year resolution grain-size data from Lake Żabińskie (northeastern Poland) to detect differences between varve microfacies. Six varve microfacies were differentiated using grain-size distributions and sedimentological attributes (calcite layer thickness, dark layer thickness, mass accumulation rate). However, changes in particle-size distributions between different varve types are relatively small and indicate a similar source for the material deposited. Decomposition of grain-size distributions with the end-member approach allows recognition of relative changes for the deposition of allochthonous (mineral) and autochthonous (carbonates, (hydr)oxides) components. Grain-size data suggest that sources of allochthonous material remained constant, while varve formation was controlled mostly by in-lake processes. View Full-Text
Keywords: varves; lake sediments; grain-size; end-members varves; lake sediments; grain-size; end-members
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Żarczyński, M.; Szmańda, J.; Tylmann, W. Grain-Size Distribution and Structural Characteristics of Varved Sediments from Lake Żabińskie (Northeastern Poland). Quaternary 2019, 2, 8.

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