Sedimentation and mineral analysis on sediment cores from the Lena Delta ...

• Main Authors: Schwamborn, Georg, Rachold, Volker, Grigoriev, Mikhail N
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2002
• Subjects: minerals; radiocarbon; river delta; Sediment core; sediments; Sampling by hand; Sampling permafrost; Seismic, shallow profile; Rotary core drilling; RU-Land_2000_Lena; RU-Land_1998_Lena; RU-Land_1999_Lena; AWI Arctic Land Expedition; Laptev Sea System LSS; Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn; Arctic; Laptev Sea; laptev; lena delta; permafrost
• Online Access: https://dx.doi.org/10.1594/pangaea.728539; https://doi.pangaea.de/10.1594/PANGAEA.728539

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 ... : Supplement to: Schwamborn, Georg; Rachold, Volker; Grigoriev, Mikhail N (2002): Late Quaternary Sedimentation History of the Lena Delta. Quaternary International, 89(1), 119-134 ...