The late pleistocene palaeogeography of Arctic Eurasian shelves

Pavlidis, Yu. A.; Dunayev, N.N.; Shcherbakov, F. A.

doi:10.1016/s1040-6182(96)00030-4

Cited by 21 publications

(10 citation statements)

References 5 publications

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“…A periglacial origin was interpreted including fluvial and aeolian activity. Equivalent deposits on the Laptev shelf may be found in submarine channels, separated by shoals, which cross the shelf and connect the river mouths with troughs or the shelf break further north (Lastochkin, 1982;Pavlidis et al, 1997;Kleiber and Niessen, 1999). Geophysical investigations on Arga Island carried out with a radioecho sound system suggest that the sandy environment found here continues at least down to about 60 m (Schwamborn et al, 2000a).…”

Section: Second Terrace (Arga Section)mentioning

confidence: 84%

Late Quaternary sedimentation history of the Lena Delta

Schwamborn

Rachold

Grigoriev

2002

Quaternary International

164

176

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Core and outcrop analysis from Lena mouth deposits have been used to reconstruct the Late Quaternary sedimentation history of the Lena Delta. Sediment properties (heavy mineral composition, grain size characteristics, organic carbon content) and age determinations ( 14 C AMS and IR-OSL) are applied to discriminate the main sedimentary units of the three major geomorphic terraces, which form the delta. The development of the terraces is controlled by complex interactions among the following four factors: (1) Channel migration. According to the distribution of 14 C and IR-OSL age determinations of Lena mouth sediments, the major river runoff direction shifted from the west during marine isotope stages 5-3 (third terrace deposits) towards the northwest during marine isotope stage 2 and transition to stage 1 (second terrace), to the northeast and east during the Holocene (first terrace deposits). (2) Eustasy. Sea level rise from Last Glacial lowstand to the modern sea level position, reached at 6-5 ka BP, resulted in back-filling and flooding of the palaeovalleys. (3) Neotectonics. The extension of the Arctic Mid-Ocean Ridge into the Laptev Sea shelf acted as a halfgraben, showing dilatation movements with different subsidence rates. From the continent side, differential neotectonics with uplift and transpression in the Siberian coast ridges are active. Both likely have influenced river behavior by providing sites for preservation, with uplift, in particular, allowing accumulation of deposits in the second terrace in the western sector. The actual delta setting comprises only the eastern sector of the Lena Delta. (4) Peat formation. Polygenetic formation of icerich peaty sand (''Ice Complex'') was most extensive (7-11 m in thickness) in the southern part of the delta area between 43 and 14 ka BP (third terrace deposits). In recent times, alluvial peat (5-6 m in thickness) is accumulated on top of the deltaic sequences in the eastern sector (first terrace). r

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Section: Second Terrace (Arga Section)mentioning

confidence: 84%

Late Quaternary sedimentation history of the Lena Delta

Schwamborn

Rachold

Grigoriev

2002

Quaternary International

164

176

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“…The glaciation curves of the central BarentsrKara Sea ice-sheets during the Late Weichselian are still Ž under discussion e.g., Grosswald, 1993;Pavlidis et . al., 1997;Velitchko et al, 1997a,b .…”

Section: žmentioning

confidence: 99%

“…sen et al, 1998 . Therefore, the two major discrepancies concerning the extent and volume of the icesheets along the Eurasian continental margin during Ž glacials have not yet been resolved e.g., Denton and Hughes, 1981;Dunayev and Pavlidis, 1988;Grosswald, 1993;Pavlidis et al, 1997;Velitchko et al, . 1997a,b and the recently found dynamic coupling of Atlantic water inflow and the Arctic Ocean hydrog-Ž .…”

Section: Introductionmentioning

confidence: 99%

A multiproxy approach to reconstruct the environmental changes along the Eurasian continental margin over the last 150 000 years

et al. 2000

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“…Ice‐free conditions on the shelf areas in the Pechora, Kara and the Laptev Seas in the Late Weichselian (e.g. Alekseev, 1997; Pavlidis et al ., 1997; Serebryannyy et al ., 1998), mean that dispersal of biota by rafting with drift ice or driftwood could theoretically have taken place from north‐west Russian and Siberian sources towards the Fram Strait and the Nordic seas.…”

Section: Dispersal Of Biota By Drift Ice and Driftwoodmentioning

confidence: 99%

“…However, recent geomorphological and palaeobotanical evidence show large ice‐free areas in north‐west Russia and western Siberia in the Late Weichselian and no barrier in the form of a great Panarctic ice sheet (e.g. Alekseev, 1997; Pavlidis et al ., 1997; Serebryannyy et al ., 1998; Svendsen et al ., 1999). This means that a route was also open for chance dispersal by rivers and the sea.…”

Section: Introductionmentioning

confidence: 99%

A contribution to the discussion of biota dispersal with drift ice and driftwood in the North Atlantic

Johansen¹,

Hytteborn²

2001

Journal of Biogeography

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Aim The present work aims to review the early proposed hypothesis of biota dispersal by driftwood and drift ice. Location The North Atlantic region. Methods New knowledge gained about drift ice patterns and sources and transport routes of ice‐rafted debris and dendrochronologically dated driftwood is used to investigate chance dispersal of diaspores. In addition, the extremely disjunct distribution patterns of some vascular plants in Scandinavia and East Greenland are examined in the light of this new data. Results Both drift ice and driftwood are thought to be important in the chance dispersal of diaspores from Siberia and North‐west Russia to parts of the North Atlantic region, in the Late Weichselian or early Holocene. It is proposed that the extremely disjunct distribution of some vascular plants in northern Scandinavia and East Greenland (e.g. Draba sibirica, Oxytropis deflexa ssp. norvegica, Potentilla stipularis and Trisetum subalpestre) are examples of this type of long‐distance dispersal. Main conclusions The concentration of extremely disjunct distributed vascular plant species in parts of northern Norway and East Greenland is suggested to relate to the Late Weichselian ice free conditions and the topography and exposure of the coastline in these areas, allowing accumulation of ice‐rafted debris and driftwood. A systematic survey of debris samples obtained from drift ice and driftwood trees is needed to evaluate the significance of these vectors for dispersal of biota to the North Atlantic region.

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The late pleistocene palaeogeography of Arctic Eurasian shelves

Cited by 21 publications

References 5 publications

Late Quaternary sedimentation history of the Lena Delta

Late Quaternary sedimentation history of the Lena Delta

A multiproxy approach to reconstruct the environmental changes along the Eurasian continental margin over the last 150 000 years

A contribution to the discussion of biota dispersal with drift ice and driftwood in the North Atlantic

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