A local clay-varve chronology of Onega Ice Lake, NW Russia

Hang, Tiit; Gurbich, Viktor; Subetto, Dmitry; Страховенко, В Д; Potakhin, Maksim; Belkina, Natalia; Zobkov, Mikhail

doi:10.1016/j.quaint.2019.03.021

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…The catchment area is ca 62,800 km 2 , and the surface area is ca 9720 km 2 [25]. Numerous publications are devoted to the geological structure and development history of Lake Onego and its basin [26][27][28][29][30][31][32]. The northern part of the catchment area of Lake Onego is composed of Precambrian crystalline rocks (granites, gneisses) that are resistant to abrasion processes, as well as deeply metamorphosed volcanogenic and sedimentary rocks of the Lower Proterozoic.…”

Section: Methodsmentioning

confidence: 99%

“…The chemical composition of FM crusts from Lake Shotozero is as follows: iron zones (%): Fe (37-58), Mn (0-6), Ba (0), O (28-39), P (0.5-2), and total (72-100); manganese zones (%): Fe (0-3), Mn (33-55), Ba (1)(2)(3)(4)(5)(6)(7)(8), O (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42), P (0), and total (56-99). The chemical composition of FM nodules from Lake Shotozero is as follows: granular zones (%): Fe (33-51), Mn (0-2), Ba (0), O (28-39), P (0.5-1), and total (61-96); manganese zones (%): Fe (0-20), Mn (33-56), Ba (1)(2)(3)(4)(5)(6)(7)(8), O (26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36), P (0), and total (60-99). Quite often, in the chemical composition of the FMC, the presence of Si, Al, Na, and Ca is determined in contents from 0.2% to 6%.…”

Section: Core Stratification Of the Bottom Sediment Of Lake Onego Mor...mentioning

confidence: 99%

“…During chemical composition analysis of FM nodules and crusts from these lakes, the constant presence of Ba and Fe in signifficant amounts in manganese zones was revealed, along with the presence of Mn and P impurities in the granular zones. The chemical composition of FM nodules from Lake Surgubskoe is as follows: granular zones (%): Fe (24-67), Mn (0-21), Ва (0-0.5), O (28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42), Р (0.5-2), and total (44-100); manganese zones (%): Fe (1-35), Mn (38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)(52), Ва (4-12), O , Р (0-1), and total (55-99).…”

Section: Geochemical Composition Of Bottom Sediments and Fmc Of Lakesmentioning

confidence: 99%

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Distribution of Elements in Iron-Manganese Formations in Bottom Sediments of Lake Onego (NW Russia) and Small Lakes (Shotozero and Surgubskoe) of Adjacent Territories

et al. 2020

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The morphology and mineralogical and geochemical compositions of the freshwater ferromanganese formations (FMF) of Lake Onego (NW Russia) and small lakes located in its catchment area were studied. The lake waters, bottom sediments and FMF were analyzed by a set of modern methods of geochemistry, mineralogy, and crystal chemistry (powder X-ray diffraction, IR spectroscopy, electron microscopy, ICP–MS analysis, atomic absorption, etc.). A detailed description of the microscopic structure in comparison with the geochemical characteristics of the FMF provides new information on the role of biota in the formation and behavior of individual elements at various stages in the nodule formation process. This study shows the homogeneous composition of microconcretions—only manganese or only ferruginous—in bottom sediments throughout the entire water area of Lake Onego and the rhythmic structures of the nodules, formed by macro- and microlayers with mineralized microbiota. The layers are composed of either crystalline Mn mineral phases (pyrolusite, rhodochrosite) or crystalline Fe mineral phases (siderite, goethite). The separation of Mn and Fe mineral phases in the nodules proceeded during their formation and diagenesis. The examined chemical and mineral compositions, textures, and structures of the nodules are a testament to the hydrogenic source of their ore substance and the formation of FMF is controlled primarily by redox environments at the water–sediment interface.

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Section: Methodsmentioning

confidence: 99%

Section: Core Stratification Of the Bottom Sediment Of Lake Onego Mor...mentioning

confidence: 99%

Section: Geochemical Composition Of Bottom Sediments and Fmc Of Lakesmentioning

confidence: 99%

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Distribution of Elements in Iron-Manganese Formations in Bottom Sediments of Lake Onego (NW Russia) and Small Lakes (Shotozero and Surgubskoe) of Adjacent Territories

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“…In some sediment sequences from central part of Lake Onego the thickness of varves varies from 1 to 1.5 cm. In this unit, there is a marking "pink" horizon with a thickness of 0.3-0.4 m. This microlaminated clays are called "pink clay layer" [5,8]. Lithological unit 4.Typical varved clays with graded layering with thickness up to 3-4 m (Figure 7).…”

Section: Stratigraphic Featuresmentioning

confidence: 99%

Structure of Late Pleistocene and Holocene Sediments in the Petrozavodsk Bay, Lake Onego (NW Russia)

et al. 2020

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Here, we present new results from seismic, geological, and geochemical studies conducted in 2015–2019 in the Petrozavodsk Bay of Lake Onego, NW Russia. The aims of these investigations were to (i) to characterize the structure of Quaternary deposits and (ii) provide new evidence of modern geodynamic movements and gas-seepage in Holocene sediments. The structure of the recovered deposits was composed of lacustrine mud, silt and sands from the Holocene, limno-glacial clays (varved clays) from the Late Glacial–Interglacial Transition, and glacial deposits (till) from the Late Pleistocene. The thickness of these deposits varied in different parts of the bay. Many pockmarks created by gases escaping and reaching sediment-water interface were observed in these deposits. Such pockmarks can play a significant role in the geochemical and biological processes in the bottom sediment surface, and gases that escape might modify the physicochemical characteristics of the environment.

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Waterborne GPR mapping of stratigraphic boundaries and turbidite sediments beneath the bottom of Lake Polevskoye, Karelia, NW Russia

2021

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A local clay-varve chronology of Onega Ice Lake, NW Russia

Cited by 9 publications

References 20 publications

Distribution of Elements in Iron-Manganese Formations in Bottom Sediments of Lake Onego (NW Russia) and Small Lakes (Shotozero and Surgubskoe) of Adjacent Territories

Distribution of Elements in Iron-Manganese Formations in Bottom Sediments of Lake Onego (NW Russia) and Small Lakes (Shotozero and Surgubskoe) of Adjacent Territories

Structure of Late Pleistocene and Holocene Sediments in the Petrozavodsk Bay, Lake Onego (NW Russia)

Waterborne GPR mapping of stratigraphic boundaries and turbidite sediments beneath the bottom of Lake Polevskoye, Karelia, NW Russia

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