Geochemical history of a Lower Miocene lake, the Cypris Formation, Sokolov Basin, Czech Republic

Křı́bek, Bohdan; Knésl, Ilja; Rojík, Petr; Sýkorová, Ivana; Martínek, Karel

doi:10.1007/s10933-017-9970-2

Cited by 13 publications

(18 citation statements)

References 39 publications

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“…If the K/Rb ratio is not stable and tends to be larger than that in the UCC, post-sedimentary enrichment by K (metasomatism) could have acted (van den Kamp, 2016). The impact of metasomatism was also evaluated using A-CN-K plots (Fedo et al, 1995, also used by Zhao et al, 2018, microscopic examination of clay mineral particles to distinguish their detrital and autochthonous origin (Martínez-Braceras et al, 2017;Wang et al, 2017), and mineral (micro)analysis (Kříbek et al, 2017;Foerster et al, 2018) to…”

Section: Checklist For Interpretation Of K Concentrations In Sedimentsmentioning

confidence: 99%

“…Their correct handling is not trivial and needs further research and testing. (2) In hydrologically closed lacustrine or palustrine environments, the main mechanism controlling K concentrations may be the neo-formation of K-carriers in sediments in contact with pore waters mineralised during prolonged droughts (Foerster et al, 2015), in particular formation of analcime, illite, and feldspars from dissolved K + , kaolinite and other clay minerals (Larsen, 2008;Kříbek et al, 2017;Foerster et al, 2018). This mechanism is thermodynamically analogous to "retrograde" clay mineral formation in the marine environment (Cuadros et al, 2017) and basinal brines (van den Kamp, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Checklist for the use of potassium concentrations in siliciclastic sediments as paleoenvironmental archives

Grygar

Mach²,

Martínez

2019

Sedimentary Geology

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Weathering indices quantify the release of mobile elements from source units of soils and sediments. They have been employed in geosciences for more than three decades, but their performance in sedimentary archives can still be improved by deciphering other forcing factors than climatic. From the most common alkali and alkaline earth metals included in the weathering indices, K seems to be most suitable for deciphering paleoclimate records of temperate to subtropical non-arid climates, assuming the interpretation respects the complex of controlling factors on sediment geochemistry. As a case study, normalised K concentrations in siliciclastic sediments of the Most Basin (Miocene period, central Europe) are revisited here and variations compared with modern fluvially transported solids. Existing knowledge on manifold controls of K concentrations in sediments is summarised and used to propose list of possible controlling factors, in particular Al/Si and Zr/Rb as grain-size proxies, Ti/Al as provenance proxy relevant for K concentration in parent rocks,

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Section: Checklist For Interpretation Of K Concentrations In Sedimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Checklist for the use of potassium concentrations in siliciclastic sediments as paleoenvironmental archives

Grygar

Mach²,

Martínez

2019

Sedimentary Geology

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“…Such methods are simple, rapid and give significant additional insight into lake bathymetry and basin-wide sediment stratigraphy that permits the retrieval of sediment thicknesses and volumes (Ferland et al, 2012). Recent hydroacoustic-based studies from central and western Siberia have concentrated on determining Holocene and Late Pleistocene sediment distributions and volumes within glacial lakes and have proven highly useful for understanding glacial history in these regions (Haflidason et al, 2019;Lebas et al, 2019). The inclusion of sediment budgets within investigations of carbon pools is important as it allows the future storage capacity of lakes to be estimated (Hinderer and Einsele, 2001).…”

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confidence: 99%

Sediment and carbon accumulation in a glacial lake in Chukotka (Arctic Siberia) during the Late Pleistocene and Holocene: combining hydroacoustic profiling and down-core analyses

et al. 2021

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Abstract. Lakes act as important sinks for inorganic and organic sediment components. However, investigations of sedimentary carbon budgets within glacial lakes are currently absent from Arctic Siberia. The aim of this paper is to provide the first reconstruction of accumulation rates, sediment and carbon budgets from a lacustrine sediment core from Lake Rauchuagytgyn, Chukotka (Arctic Siberia). We combined multiple sediment biogeochemical and sedimentological parameters from a radiocarbon-dated 6.5 m sediment core with lake basin hydroacoustic data to derive sediment stratigraphy, sediment volumes and infill budgets. Our results distinguished three principal sediment and carbon accumulation regimes that could be identified across all measured environmental proxies including early Marine Isotope Stage 2 (MIS2) (ca. 29–23.4 ka cal BP), mid-MIS2–early MIS1 (ca. 23.4–11.69 ka cal BP) and the Holocene (ca. 11.69–present). Estimated organic carbon accumulation rates (OCARs) were higher within Holocene sediments (average 3.53 g OC m−2 a−1) than Pleistocene sediments (average 1.08 g OC m−2 a−1) and are similar to those calculated for boreal lakes from Quebec and Finland and Lake Baikal but significantly lower than Siberian thermokarst lakes and Alberta glacial lakes. Using a bootstrapping approach, we estimated the total organic carbon pool to be 0.26 ± 0.02 Mt and a total sediment pool of 25.7 ± 1.71 Mt within a hydroacoustically derived sediment volume of ca. 32 990 557 m3. The total organic carbon pool is substantially smaller than Alaskan yedoma, thermokarst lake sediments and Alberta glacial lakes but shares similarities with Finnish boreal lakes. Temporal variability in sediment and carbon accumulation dynamics at Lake Rauchuagytgyn is controlled predominantly by palaeoclimate variation that regulates lake ice-cover dynamics and catchment glacial, fluvial and permafrost processes through time. These processes, in turn, affect catchment and within-lake primary productivity as well as catchment soil development. Spatial differences compared to other lake systems at a trans-regional scale likely relate to the high-latitude, mountainous location of Lake Rauchuagytgyn.

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“…Changes in the chemical compositions of lake sediments can indicate regional chemical weathering and environmental evolution (Guimarães et al, ; Hahn et al, ; Morrill et al, ; Outridge et al, ). Moreover, the spatial distributions of elements in lake sediments, a powerful indicator of past environmental conditions (Chawchai et al, ; Sahoo et al, ; Tanaka et al, ; Xiao et al, ), can reveal the provenance of sediments and the weathering intensity of their source areas (Allen et al, ; Jin et al, ; Kříbek et al, ). Thus, temporal changes in lake sediment chemical composition have been the focus of many sedimentology and paleoclimatology studies (L. Chen et al, ; Day et al, ; J. Wang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Environmental Significance of the Chemical Composition of Sediments in Groundwater‐Recharged Lakes of the Badain Jaran Desert, NW China

Chen

Zou

et al. 2019

Geochem Geophys Geosyst

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For lakes in desert hinterlands that are not recharged by river runoff, sediment is input solely by wind transport; however, the mechanisms that control the spatial variations in geochemical characteristics of sediments in such lakes remain unclear. Moreover, it remains uncertain whether some element ratios can be used as proxies for environmental characteristics. In this study, 100 surface sediment samples were collected from five lakes in the hinterland of the Badain Jaran Desert, NW China, and examined for their major, trace and rare earth element contents and mineral assemblages. Chemical composition and mineral components of the sediments differed significantly between lakes with different total dissolved solids (TDS). Geochemical characteristics of the lake sediments and their spatial variations are influenced by eolian sands, saline minerals, and sediment sorting. Eolian sands dominate the immobile and nonsoluble elements, whereas authigenic minerals are important in influencing variations in the mobile and soluble elements. Sediment sorting is reflected in the spatial variation of the sediment chemical composition. The positive relationship between the SiO 2 /Ti of sediment and lake area indicates that changes in the SiO 2 /Ti ratio can reveal approximate lake area. The Na 2 O/K 2 O ratio in sediments can reveal the TDS of salt lakes more effectively than can the Rb/Sr ratio. However, the key factors and mechanisms governing the chemical composition of sediments at different brine evolution stages vary among lakes with different TDS levels, which should be carefully considered when interpreting the environmental significance of the chemical composition as a proxy for paleoenviroment change.

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Geochemical history of a Lower Miocene lake, the Cypris Formation, Sokolov Basin, Czech Republic

Cited by 13 publications

References 39 publications

Checklist for the use of potassium concentrations in siliciclastic sediments as paleoenvironmental archives

Checklist for the use of potassium concentrations in siliciclastic sediments as paleoenvironmental archives

Sediment and carbon accumulation in a glacial lake in Chukotka (Arctic Siberia) during the Late Pleistocene and Holocene: combining hydroacoustic profiling and down-core analyses

Environmental Significance of the Chemical Composition of Sediments in Groundwater‐Recharged Lakes of the Badain Jaran Desert, NW China

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