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Search Results (3)

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Keywords = varve microfacies

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3 pages, 194 KiB  
Editorial
Annually Laminated Lake Sediments—Recent Progress
by Wojciech Tylmann and Bernd Zolitschka
Quaternary 2020, 3(1), 5; https://doi.org/10.3390/quat3010005 - 3 Mar 2020
Cited by 8 | Viewed by 3097
Abstract
The collection of papers entitled “Annually Laminated Lake Sediments” illustrates the recent progress made in varved sediment research and highlights the variety of methodological approaches and research directions used. The contributions cover the monitoring of modern sediment fluxes using sediment traps, geochronological and [...] Read more.
The collection of papers entitled “Annually Laminated Lake Sediments” illustrates the recent progress made in varved sediment research and highlights the variety of methodological approaches and research directions used. The contributions cover the monitoring of modern sediment fluxes using sediment traps, geochronological and sedimentological analyses of varves, multi-proxy investigations, including geochemical and biological proxies, as well as spatiotemporal analyses based on multi-core studies supported by satellite images. The scientific issues discussed the influences of hydroclimatological phenomena on short-term changes in sediment flux, the relationships between biogeochemical processes in the water column and the formation of varves, the preservation of environmental signals in varves, and possibilities of synchronizing varved records with other high-resolution environmental archives. Full article
(This article belongs to the Special Issue Annually Laminated Lake Sediments)
15 pages, 6269 KiB  
Article
Grain-Size Distribution and Structural Characteristics of Varved Sediments from Lake Żabińskie (Northeastern Poland)
by Maurycy Żarczyński, Jacek Szmańda and Wojciech Tylmann
Quaternary 2019, 2(1), 8; https://doi.org/10.3390/quat2010008 - 4 Feb 2019
Cited by 18 | Viewed by 5993
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Annually Laminated Lake Sediments)
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9 pages, 5397 KiB  
Article
Preliminary Characteristics of Laminations in Recent Sediments from Lakes Kamenduł and Perty in the Suwałki Landscape Park, Northeastern Poland
by Wojciech Tylmann, Małgorzata Kinder, Maurycy Żarczyński and Anna Poraj-Górska
Limnol. Rev. 2016, 16(4), 237-245; https://doi.org/10.1515/limre-2016-0026 (registering DOI) - 18 Feb 2017
Cited by 3 | Viewed by 464
Abstract
Varved lake sediments are well known archives used for paleoenvironmental reconstructions. They provide continuous, high-resolution and calendar-year chronologies of past environmental changes. From lakes Kamenduł and Perty, located in the Suwałki Landscape Park, short cores of laminated sediments were collected and investigated using [...] Read more.
Varved lake sediments are well known archives used for paleoenvironmental reconstructions. They provide continuous, high-resolution and calendar-year chronologies of past environmental changes. From lakes Kamenduł and Perty, located in the Suwałki Landscape Park, short cores of laminated sediments were collected and investigated using microfacies analysis and X-ray fluorescence (XRF) scanning. Sediments of Lake Kamenduł form biogenic (calcite) varves with pale lamina containing precipitated calcite and dark lamina composed of mixed organic and clastic material. There is a visible difference between varves in the lower and the topmost part of the core. The varve thickness and clastic material content decrease upcore. Analysed sediments of Lake Perty also show laminated structures which are biogenic varves composed of calcite laminas interbedded with layers of mixed material and dark laminas containing mostly organic material with some clastic particles. Our study shows that further analysis of sediments from these lakes may provide valuable information about past land use changes in their catchments as well as changes in the water column, i.e., mixing regimes and redox conditions. Full article
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