2002/01/01 by Elena Y. Pavlova, Pavlova, E. Y., M. V. Dorozhkina +1 · 1 citation
Earth and Planetary Sciences · Environmental Science · #Geological Studies and Exploration #Geology and Paleoclimatology Research #Methane Hydrates and Related Phenomena #Science
paper · pdf · doi:10.2312/polarforschung.70.89
openalex publication_date 2002/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/15
This study presents the geological-geomorphologic characreristics of the Holocene alluvial-delta relief complex of the Lena River delta and deposits comprising it.A complex of the Holocene alluvial-delta relief is represented by a set of channel forrns ancl a low floodplain of modern age, a high floodplain fonning from the end of the Early-Late Holocene and the first above-the floodplain terrace formed in the Early-Middle Holacene.During the Early Middle Holacene, the main runoff of the Lena river was in the northwestern and northern direction along the Olenyokskaya and Malaya and Bolshaya Turnatskaya branches.At the end of the Middle-Late Holocene as a result of non-unidirectional tectonic development of the western and eastern delta sectors, a change of the main runoff in the Lena mouth area from northwest-north to northeast-east occurred.The hydrological regime at the current stage plays a decisive role in the relief formation in the Lena River mouth area.The river factars (discharge of water and sedirnents to the delta, their distribution by delta arms, water level rise height in the branches during the flood and iee drift character) control completely the accumulation of alluvial deposits and the relief formation of the camplex of channel forms and the low floodplain in the internal parts of the Lena River delta.They also influence the processes of destruction of the high floodplain shores, the first above-the floodplain terrace and more ancient terrace levels.The marine factars control the relief formation wirhin the external delta margin.The most significant role in the relief formation in the group of marine factars belongs to surge sea level oscillations, whose influence spreads along the large arrns over a distance of up to 56-90 km from the marine delta margin, influencing the relief development of a complex of channel forms and the low f1oodplain.The tidal phenomena playa noticeable relief-forming role only wirhin the open external northern and northeastern margin of the Lena mouth area on the protrusion delta Ionnation segments.Zusammenfassung: Die vorliegende Arbeit beschftigt sich mit der geologisch-geomorphologischen Charakteristik des holoznen, alluvialen Reliefs des Lena-Deltas.Das holozne, alluviale Delta-Relief wird durch einen Komplex von Flussbettformen und die rezente untere "Iloodplain", die obere "floodplain" mittel-bis spt-holoznen Alters sowie die erste Terrasse oberhalb der "floodplains", die ein frh-bis mittel-holoznes Alter aufweist, gebildet.Der Hauptteil des Lena-Ausstrorns war whrend des Frh-bis Mittel-Holozns nach NW und N entlang des Olenyok-sowie des kleinen und groen Tumatskaya-