Preliminary estimation of Lake El'gygytgyn water balance and sediment income

Fedorov, Grigory; Nolan, M.; Brigham‐Grette, Julie; Bolshiyanov, Dimitry Yu; Schwamborn, Georg; Juschus, O.

doi:10.5194/cp-9-1455-2013

Cited by 23 publications

(48 citation statements)

References 19 publications

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“…In the deep lake basin, the accumulated sediments are fine grained Wennrich et al, 2013a), suggesting that the coarser grained mass movements, in particular debrites, but also grain flows and turbidites, originate from shallow water depths, where such sediments are found (Juschus et al, 2011). The large alluvial fan and its subaqueous prologation in the western and northern lake catchment provide coarser grained sediments into the lake basin (Schwamborn et al, 2012;Fedorov et al, 2013) and delta collapses account for some of the mass movements encountered at the lake center. This can also be seen as multiple mass flows on the western lake slope in the seismic profile (Fig.…”

Section: Possible Triggering Mechanisms For Mass Movement Eventsmentioning

confidence: 99%

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Mass movement deposits in the 3.6 Ma sediment record of Lake El'gygytgyn, Far East Russian Arctic

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This paper focuses on the characterization and genesis of mass movement deposits (MMDs) in the Quaternary and Pliocene sediments of Lake El'gygytgyn, Far East Russian Arctic. Three partly overlapping holes were drilled into the 320 m long sediment record at International Continental Scientific Drilling Program (ICDP) Site 5011-1 in the lake basin, recovering the Quaternary almost completely, and the Pliocene down to 3.6 Ma with 52% recovery. Mass movement deposits were investigated in all three cores, based on macroscopical core descriptions, radiographic images, high-resolution magnetic susceptibility and gamma-ray density. Five different types of MMDs were identified: turbidites, grain-flow deposits, debrites, slumps and slides. These are formed by transitional mass movement processes, and thus can be co-generic. An initial slope failure is thought to transform into a debris flow that deforms frontal sediments, partly disintegrates and dilutes into a turbidity flow. Turbidites are by far the most frequent MMD type in the lake center. They occur throughout the record in all pelagic sedimentary facies, but they are thinner in facies formed during cold climate conditions. All other MMDs, by contrast, incise exclusively the pelagic facies deposited during warm climates. In the 123 m thick Quaternary composite sediment record 230 mass movement events are identified, comprising 33% of the sediment length. Turbidites contribute 93% of the number of Quaternary MMDs, but only 35% of their thickness. In the Pliocene sediments between 123 and 320 m, 181 additional mass movement deposits are identified, which constitute ~33% of the recovered sediments. The mean recurrence interval for MMDs is 11 and 5 ka in the Quaternary and Pliocene, respectively

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Section: Possible Triggering Mechanisms For Mass Movement Eventsmentioning

confidence: 99%

“…Sediment is transported to the lake through fluvial and aeolian transport as well as by gravitative mass movement processes Fedorov et al, 2013;. Even though the number of inlet streams is high, their sediment discharge to the lake is rather small.…”

Section: Prerequisite Site Informationmentioning

confidence: 99%

Mass movement deposits in the 3.6 Ma sediment record of Lake El'gygytgyn, Far East Russian Arctic

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“…1; Nolan and Brigham-Grette, 2007), which deliver sediment in the order of ca. 350 t yr −1 into the lake (Fedorov et al, 2013). In 2003, main sediment discharge occurred during snowmelt in spring and early summer, with highest values of 24 g s −1 in June and 0.33 g s −1 in August measured in creek 49 (cf.…”

Section: Site Informationmentioning

confidence: 99%

“…Our grain-size investigations on ICDP core 5011-1 extend the results from this early research to the entire Quaternary. Furthermore, we incorporated more recent findings on the modern climatological, hydrological, and sedimentological settings (Fedorov et al, 2013;Wennrich et al, 2013a). To better understand the sedimentological processes operating in Lake El'gygytgyn, we used principal component analysis (PCA) to detect dominating variations in the grain-size distributions, and we employed time series analysis to reveal oscillations in the granulometric data and their relative dominance over time.…”

Section: A Francke Et Al: Multivariate Statistic and Time Series Anmentioning

confidence: 99%

Multivariate statistic and time series analyses of grain-size data in quaternary sediments of Lake El'gygytgyn, NE Russia

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Abstract. Lake El'gygytgyn, located in the Far East Russian Arctic, was formed by a meteorite impact about 3.58 Ma ago. In 2009, the International Continental Scientific Drilling Program (ICDP) at Lake El'gygytgyn obtained a continuous sediment sequence of the lacustrine deposits and the upper part of the impact breccia. Here, we present grain-size data of the past 2.6 Ma. General downcore grain-size variations yield coarser sediments during warm periods and finer ones during cold periods. According to principal component analysis (PCA), the climate-dependent variations in grainsize distributions mainly occur in the coarse silt and very fine silt fraction. During interglacial periods, accumulation of coarser material in the lake center is caused by redistribution of clastic material by a wind-induced current pattern during the ice-free period. Sediment supply to the lake is triggered by the thickness of the active layer in the catchment and the availability of water as a transport medium. During glacial periods, sedimentation at Lake El'gygytgyn is hampered by the occurrence of a perennial ice cover, with sedimentation being restricted to seasonal moats and vertical conduits through the ice. Thus, the summer temperature predominantly triggers transport of coarse material into the lake center. Time series analysis that was carried out to gain insight into the frequency of the grain-size data showed variations predominately on 98.5, 40.6, and 22.9 kyr oscillations, which correspond to Milankovitch's eccentricity, obliquity and precession bands. Variations in the relative power of these three oscillation bands during the Quaternary suggest that sedimentation processes at Lake El'gygytgyn are dominated by environmental variations caused by global glacial-interglacial variations (eccentricity, obliquity), and local insolation forcing and/or latitudinal teleconnections (precession), respectively.

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“…Earlier it was stated that the lake is snowmelt fed (Cremer and Wagner, 2003) based on the low lake water EC (< 20 µS cm −1 ). In recent studies it was found that the lake water column is well mixed with low evaporation (Chapligin et al, 2012a) and the period of lake water residence time is about 100 years (Fedorov et al, 2013). An isotopic composition similar to what has been described for snow and lake water is found in particular in HZ 4 with their matching mean δ values (Fig.…”

Section: Ground-ice Origin: Constraints From Downcore Hydrochemical Amentioning

confidence: 99%

Past freeze and thaw cycling in the margin of the El'gygytgyn crater deduced from a 141 m long permafrost record

Schwamborn

Meyer²,

Schirrmeister³

et al. 2014

Clim. Past

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Abstract. The continuous sediment record from Lake El'gygytgyn in the northeastern Eurasian Arctic spans the last 3.6 Ma and for much of this time permafrost dynamics and lake level changes have likely played a crucial role for sediment delivery to the lake. Changes in the ground-ice hydrochemical composition (δ 18 O, δD, pH, electrical conductivity, Na + , Mg 2+ , Ca 2+ , K + , HCO − 3 , Cl − , SO − 4 ) of a 141 m long permafrost record from the western crater plain are examined to reconstruct repeated periods of freeze and thaw at the lake edge. Stable water isotope and major ion records of ground ice in the permafrost reflect both a synsedimentary palaeo-precipitation signal preserved in the near-surface permafrost (0.0-9.1 m core depth) and a post-depositional record of thawing and refreezing in deeper layers of the core (9.1-141.0 m core depth). These lake marginal permafrost dynamics were controlled by lake level changes that episodically flooded the surfaces and induced thaw in the underlying frozen ground. During times of lake level fall these layers froze over again. At least three cycles of freeze and thaw are identified and the hydrochemical data point to a vertical and horizontal talik refreezing through time. Past permafrost thaw and freeze may have destabilised the basin slopes of Lake El'gygytgyn and this has probably promoted the release of mass movements from the lake edge to the deeper basin as known from frequently occurring turbidite layers in the lake sediment column.

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Preliminary estimation of Lake El'gygytgyn water balance and sediment income

Cited by 23 publications

References 19 publications

Mass movement deposits in the 3.6 Ma sediment record of Lake El'gygytgyn, Far East Russian Arctic

Mass movement deposits in the 3.6 Ma sediment record of Lake El'gygytgyn, Far East Russian Arctic

Multivariate statistic and time series analyses of grain-size data in quaternary sediments of Lake El'gygytgyn, NE Russia

Past freeze and thaw cycling in the margin of the El'gygytgyn crater deduced from a 141 m long permafrost record

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