Detailed insight into Arctic climatic variability during MIS 11c at Lake El'gygytgyn, NE Russia

Vogel, Hendrik; Meyer-Jacob, Carsten; Melles, Martin; Brigham‐Grette, Julie; Andreev, Andrei A.; Wennrich, Volker; Tarasov, Pavel E.; Rosén, Peter

doi:10.5194/cp-9-1467-2013

Cited by 33 publications

(29 citation statements)

References 57 publications

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“…According to the age-depth model these horizons correlate with MIS 11.3 (430-390 ka) and MIS 9.3 (340-320 ka). The SiO 2 enrichment in these zones is caused by elevated BSi and represents levels of high primary productivity in the lake (Cunningham et al, 2013;Vogel et al, 2013). The interval corresponding to MIS 11 exhibits the greatest peak in diatom concentrations .…”

Section: Siomentioning

confidence: 99%

Inorganic geochemistry data from Lake El'gygytgyn sediments: marine isotope stages 6–11

Minyuk¹,

Borkhodoev²,

Wennrich

2014

Clim. Past

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Abstract. Geochemical analyses were performed on sediments recovered by deep drilling at Lake El'gygytgyn in central Chukotka, northeastern Russia (67 • 30 N; 172 • 05 E). Major and rare element concentrations were determined using X-ray fluorescence spectroscopy (XRF) on the < 250 µm fraction from 617 samples dated to ca. 440 and 125 ka, which approximates marine isotope stages (MIS) 11 to 6. The inorganic geochemistry indicates significant variations in elemental composition between glaciations and interglaciations. Interglacial sediments are characterized by high contents of SiO 2 , Na 2 O, CaO, K 2 O, and Sr and are depleted in Al 2 O 3 , Fe 2 O 3 , TiO 2 , and MgO. An extreme SiO 2 enrichment during MIS 11.3 and 9.3 was caused by an enhanced flux of biogenic silica (BSi). The geochemical structure of MIS 11 shows similar characteristics as seen in MIS 11 records from Lake Baikal (southeastern Siberia) and Antarctic ice cores, thereby arguing for the influence of global forcings on these records. High sediment content of TiO 2 , Fe 2 O 3 , MgO, Al 2 O 3 , LOI, Ni, Cr, and Zr typifies glacial stages, with the most marked increases during MIS 7.4 and 6.6. Reducing conditions during glacial times are indicated by peaks in the Fe 2 O 3 content and coinciding low Fe 2 O 3 /MnO ratios. This conclusion also is supported by P 2 O 5 and MnO enrichment, indicating an increased abundance of authigenic, fine-grained vivianite. Elemental ratios (CIA, CIW, PIA, and Rb/Sr) indicate that glacial sediments are depleted in mobile elements, like Na, Ca, K and Sr. This depletion was caused by changes in the sedimentation regime and thus reflects environmental changes.

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Section: Siomentioning

confidence: 99%

Inorganic geochemistry data from Lake El'gygytgyn sediments: marine isotope stages 6–11

Minyuk¹,

Borkhodoev²,

Wennrich

2014

Clim. Past

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“…Facies B is characterized by olive gray to brownish, massive to faintly banded silt, deposited during relatively warm climate conditions under a semipermanent ice cover. Peak warm climate, such as during marine isotope stages (MIS) 11.3 and 31, is reflected by laminated, reddish-brown silt and high amounts of biogenic silica (facies C) Vogel et al, 2013). Facies D consists of grayish laminated silt and clay with occasional greenish or reddish hues that grade upwards.…”

Section: Prerequisite Site Informationmentioning

confidence: 99%

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

et al. 2013

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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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“…1a). The impact occurred 3.58 ± 0.04 Myr ago (Layer, 2000; see also Melles et al, 2012 andVogel et al, 2013, for details on the regional geology). The lake has a roughly circular shape…”

Section: Site Settingmentioning

confidence: 99%

A pollen-based biome reconstruction over the last 3.562 million years in the Far East Russian Arctic – new insights into climate–vegetation relationships at the regional scale

et al. 2013

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Detailed insight into Arctic climatic variability during MIS 11c at Lake El'gygytgyn, NE Russia

Cited by 33 publications

References 57 publications

Inorganic geochemistry data from Lake El'gygytgyn sediments: marine isotope stages 6–11

Inorganic geochemistry data from Lake El'gygytgyn sediments: marine isotope stages 6–11

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

A pollen-based biome reconstruction over the last 3.562 million years in the Far East Russian Arctic – new insights into climate–vegetation relationships at the regional scale

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