Radiocarbon age and sedimentation rates of bottom sediments in the Obskaya Gube (Ob River estuary, supplement to: Kuptsov, Vladimir M; Lisitzin, Alexander P (2003): Holocene sedimentation in the Ob Guba (Bay) and the adjacent shelf zone. Translated from Oceanology, 2003, 43(2), 254-261, Oceanology, 43(2), 240-246

• Main Authors: Kuptsov, Vladimir M, Lisitzin, Alexander P
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2003
• Subjects: Gravity corer; DM49; Dmitry Mendeleev; Archive of Ocean Data ARCOD; Kara Sea; Obskaya Guba; ob river
• Online Access: https://dx.doi.org/10.1594/pangaea.761919; https://doi.pangaea.de/10.1594/PANGAEA.761919

Complex geological-geochemical studies of water column and bottom sediments were carried out during Cruise 49 of R/V "Dmitry Mendeleev" in the Kara Sea shelf zone along the Obskaya Guba (Ob River estuary) from the Pur River and Taz River mouths to 76°N. Carbon-14 concentrations in organic matter from bottom sediments were determined at 5 stations. Constant initial 14C concentration model was used to determine sedimentation rates that were taken as a basis for calculating ages of sediment cores and their separate parts and for inferring location of a depocenter, i.e. a region of maximal discharge of fine-dispersed fraction of suspended matter of river run-off. Sedimentation rate in the depocenter is 170 cm/ka. Southward moves of the depocenter were recorded for periods of sea-level rises 2 and 5 thousand years ago. Bottom sediments in the depocenter contain 45% of organic matter primary produced in the Obskaya Guba. This organic matter is an energetic basis for bottom fauna life. About 55% of organic matter comes with river run-off.