Vegetation history of central Chukotka deduced from permafrost paleoenvironmental records of the El'gygytgyn Impact Crater

Andreev, Andrei A.; Morozova, E. E.; Fedorov, Grigory; Schirrmeister, Lutz; Bobrov, Anatoly; Kienast, Frank; Schwamborn, Georg

doi:10.5194/cp-8-1287-2012

Cited by 46 publications

(60 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The plant detritus in the uppermost two metres of core points to reworked material that is associated with slope and soil mixing processes in the modern and ancient active layer. The layers between 9.5-2.5 m are associated with the Allerød given the similar pollen spectra in other deposits from the area, which have been dated accordingly (Schwamborn et al, 2006(Schwamborn et al, , 2008Andreev et al, 2012). The pollen load at 2.5-1.8 m core depth points to a cooling climate in the area that is attributed to the Younger Dryas based on a comparison with aforementioned pollen records.…”

Section: Interpretation Of the Depositional Environmentmentioning

confidence: 99%

“…A total of 210 samples spanning the whole core have been studied for pollen. More specifications related to the pollen analysis are outlined in greater detail in Andreev et al (2012). Age estimation of pollen zones is based on the correlation with pollen results from relatively well-dated El'gygytgyn lacustrine sediment cores (Lozkhin and Anderson, 2006;Lozkhin et al, 2007) and short permafrost cores from the slopes .…”

Section: Laboratory Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive

Schwamborn¹,

Fedorov²,

Ostanin³

et al. 2012

Clim. Past

Self Cite

View full text Add to dashboard Cite

Abstract. The combination of permafrost history and dynamics, lake level changes and the tectonical framework is considered to play a crucial role for sediment delivery to El'gygytgyn Crater Lake, NE Russian Arctic. The purpose of this study is to propose a depositional framework based on analyses of the core strata from the lake margin and historical reconstructions from various studies at the site. A sedimentological program has been conducted using frozen core samples from the 141.5 m long El'gygytgyn 5011-3 permafrost well. The drill site is located in sedimentary permafrost west of the lake that partly fills the El'gygytgyn Crater. The total core sequence is interpreted as strata building up a progradational alluvial fan delta. Four macroscopically distinct sedimentary units are identified. Unit 1 (141.5-117.0 m) is comprised of ice-cemented, matrix-supported sandy gravel and intercalated sandy layers. Sandy layers represent sediments which rained out as particles in the deeper part of the water column under highly energetic conditions. Unit 2 (117.0-24.25 m) is dominated by ice-cemented, matrix-supported sandy gravel with individual gravel layers. Most of the Unit 2 diamicton is understood to result from alluvial wash and subsequent gravitational sliding of coarse-grained (sandy gravel) material on the basin slope. Unit 3 (24.25-8.5 m) has icecemented, matrix-supported sandy gravel that is interrupted by sand beds. These sandy beds are associated with flooding events and represent near-shore sandy shoals. Unit 4 (8.5-0.0 m) is ice-cemented, matrix-supported sandy gravel with varying ice content, mostly higher than below. It consists of slope material and creek fill deposits. The uppermost metre is the active layer (i.e. the top layer of soil with seasonal freeze and thaw) into which modern soil organic matter has been incorporated. The nature of the progradational sediment transport taking place from the western and northern crater margins may be related to the complementary occurrence of frequent turbiditic layers in the central lake basin, as is known from the lake sediment record. Slope processes such as gravitational sliding and sheet flooding occur especially during spring melt and promote mass wasting into the basin. Tectonics are inferred to have initiated the fan accumulation in the first place and possibly the off-centre displacement of the crater lake.

show abstract

Section: Interpretation Of the Depositional Environmentmentioning

confidence: 99%

Section: Laboratory Proceduresmentioning

confidence: 99%

Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive

Schwamborn¹,

Fedorov²,

Ostanin³

et al. 2012

Clim. Past

Self Cite

View full text Add to dashboard Cite

show abstract

“…Details concerning the preparation method, identification of pollen and spores, percentage calculation, and diagram presentation are described in Melles et al (2012), Andreev et al (2012), Lozhkin and Anderson (2013). The best modern analogue (BMA) was applied to reconstruct climate variables from the palynological dataset.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2013

Self Cite

View full text Add to dashboard Cite

Here we present a detailed multi-proxy record of the climate and environmental evolution at Lake El'gygytgyn, Far East Russian Arctic during the period 430–395 ka covering the marine isotope stage (MIS) 12/11 transition and the thermal maximum of super interglacial MIS 11c. The MIS 12/11 transition at Lake El'gygytgyn is characterized by initial warming followed by a cold reversal implying similarities to the last deglaciation. The thermal maximum of MIS 11c is characterized by full and remarkably stable interglacial conditions with mean temperatures of the warmest month (MTWM) ranging between ca. 10–15 °C; annual precipitation (PANN) ranging between ca. 300–600 mm; strong in-lake productivity coinciding with dark coniferous forests in the catchment; annual disintegration of the lake ice cover; and full mixis of the water column. Such conditions persisted, according to our age model, for ca. 27 ± 8 kyr between ca. 425–398 ka. The Lake El'gygytgyn record closely resembles the climate pattern recorded in Lake Baikal (SE Siberia) sediments and Antarctic ice cores, implying interhemispheric climate connectivity during MIS 11c

show abstract

“…General geographical information concerning the geology, modern climate parameters and vegetation cover patterns in the study area has been well described and discussed in details in many other papers of this special issue (e.g., Andreev et al, 2012;Lozhkin and Anderson, 2013;Tarasov et al, 2013) and therefore is not repeated here. In this publication we focus mainly on the vegetation changes across the time spanned from 3.58 to 2.15 Myr BP.…”

Section: A a Andreev Et Al: Late Pliocene And Early Pleistocene Vementioning

confidence: 99%

Late Pliocene and Early Pleistocene vegetation history of northeastern Russian Arctic inferred from the Lake El'gygytgyn pollen record

et al. 2014

Self Cite

View full text Add to dashboard Cite

Abstract. The 318 m thick lacustrine sediment record from Lake El'gygytgyn, northeastern Russian Arctic cored by the international El'gygytgyn Drilling Project provides unique opportunities for the time-continuous reconstruction of the regional paleoenvironmental history for the past 3.6 Myr. Pollen studies of the lower 216 m of the lacustrine sediments demonstrate their value as an excellent archive of vegetation and climate changes during the Late Pliocene and Early Pleistocene. About 3.5-3.35 Myr BP, the vegetation at Lake El'gygytgyn, now an area of tundra was dominated by spruce-larch-fir-hemlock forests. After ca. 3.35 Myr BP dark coniferous taxa gradually disappeared. A very pronounced environmental change took place ca. 3.31-3.28 Myr BP, corresponding to the Marine Isotope Stage (MIS) M2, when treeless tundra-and steppe-like habitats became dominant in the regional vegetation. Climate conditions were similar to those of Late Pleistocene cold intervals. Numerous coprophilous fungi spores identified in the pollen samples suggest the presence of grazing animals around the lake. Following the MIS M2 event, larch-pine forests with some spruce mostly dominated the area until ca. 2.6 Myr BP, interrupted by colder and drier intervals ca. 3.043-3.025, 2.935-2.912, and 2.719-2.698 Myr BP. At the beginning of the Pleistocene, ca. 2.6 Myr BP, noticeable climatic deterioration occurred. Forested habitats changed to predominantly treeless and shrubby environments, which reflect a relatively cold and dry climate. Peaks in observed green algae colonies (Botryococcus) around 2.53, 2.45, 2.32-2.305, 2.20 and 2.16-2.15 Myr BP suggest a spread of shallow water environments. A few intervals (i.e., 2.55-2.53, ca. 2.37, and 2.35-2.32 Myr BP) with a higher presence of coniferous taxa (mostly pine and larch) document some relatively shortterm climate ameliorations during Early Pleistocene glacial periods.

show abstract

Vegetation history of central Chukotka deduced from permafrost paleoenvironmental records of the El'gygytgyn Impact Crater

Cited by 46 publications

References 27 publications

Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive

Depositional dynamics in the El'gygytgyn Crater margin: implications for the 3.6 Ma old sediment archive

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

Late Pliocene and Early Pleistocene vegetation history of northeastern Russian Arctic inferred from the Lake El'gygytgyn pollen record

Contact Info

Product

Resources

About