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Schwamborn, Georg; Rachold, Volker; Grigoriev, Mikhail N (2002): Sedimentation and mineral analysis on sediment cores from the Lena Delta. PANGAEA, https://doi.org/10.1594/PANGAEA.728539, Supplement to: Schwamborn, G et al. (2002): Late Quaternary Sedimentation History of the Lena Delta. Quaternary International, 89(1), 119-134, https://doi.org/10.1016/S1040-6182(01)00084-2

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Abstract:
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 (14C 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 14C 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 ice-rich 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).
Coverage:
Median Latitude: 72.866583 * Median Longitude: 125.116988 * South-bound Latitude: 72.345167 * West-bound Longitude: 123.180833 * North-bound Latitude: 73.326333 * East-bound Longitude: 127.185167
Date/Time Start: 1998-08-01T00:00:00 * Date/Time End: 2000-05-08T00:00:00
Event(s):
LD00-1316-1 * Latitude: 72.761167 * Longitude: 123.180833 * Date/Time: 2000-05-08T00:00:00 * Elevation: 45.0 m * Location: ChekanovskyHighl * Campaign: Lena-Delta2000 * Basis: Sampling on land * Method/Device: Sampling by hand (HAND) * Comment: surface sampling of brook sediments
LD00-1316-2 * Latitude: 72.761167 * Longitude: 123.180833 * Date/Time: 2000-05-08T00:00:00 * Elevation: 45.0 m * Location: ChekanovskyHighl * Campaign: Lena-Delta2000 * Basis: Sampling on land * Method/Device: Sampling by hand (HAND) * Comment: surface sampling of brook sediments; 20 m north of LD00-1316-1
LD00-1316-3 * Latitude: 72.761167 * Longitude: 123.180833 * Date/Time: 2000-05-08T00:00:00 * Elevation: 45.0 m * Location: ChekanovskyHighl * Campaign: Lena-Delta2000 * Basis: Sampling on land * Method/Device: Sampling by hand (HAND) * Comment: surface sampling of brook sediments; 20 m north of LD00-1316-2
Size:
14 datasets

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Datasets listed in this publication series

  1. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Age determinations and sedimentology Arga Island, Lena Delta. https://doi.org/10.1594/PANGAEA.128931
  2. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Age determinations and sedimentology Sagastyr Island, Lena Delta. https://doi.org/10.1594/PANGAEA.128930
  3. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Age determinations and sedimentology Samoylov Island, Lena Delta. https://doi.org/10.1594/PANGAEA.128927
  4. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Age determinations and sedimentology Sardakh Island, Lena Delta. https://doi.org/10.1594/PANGAEA.128926
  5. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Age determinations and sedimentology from Nagyrn, Lena Delta. https://doi.org/10.1594/PANGAEA.128924
  6. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Age determinations and sedimentology of core PG1440 from Lake Nikolai on Arga Island. https://doi.org/10.1594/PANGAEA.128662
  7. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Age determinations and sedimentology, Kurungnakh, Lena Delta. https://doi.org/10.1594/PANGAEA.128925
  8. Schwamborn, G; Rachold, V; Grigoriev, MN (2003): Heavy mineral analysis from brook sediments at Chekanovsky Highlands, Lena Delta. https://doi.org/10.1594/PANGAEA.129198
  9. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Heavy minerals from sediments at Arga Island, Lena Delta. https://doi.org/10.1594/PANGAEA.129025
  10. Schwamborn, G; Rachold, V; Grigoriev, MN (2003): Heavy minerals from sediments at Kurungnakh, Lena Delta. https://doi.org/10.1594/PANGAEA.129286
  11. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Heavy minerals from sediments at Samoylov Island, Lena Delta. https://doi.org/10.1594/PANGAEA.128987
  12. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Heavy minerals from sediments at Sardakh Island, Lena Delta. https://doi.org/10.1594/PANGAEA.128954
  13. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Sedimentology at Jepperies Island, Lena Delta. https://doi.org/10.1594/PANGAEA.128929
  14. Schwamborn, G; Rachold, V; Grigoriev, MN (2002): Sedimentology at Tumatskaya branch, Lena Delta. https://doi.org/10.1594/PANGAEA.128928