Kuptsov, Vladimir M; Lisitzin, Alexander P (2003): Radiocarbon age and sedimentation rates of bottom sediments in the Obskaya Gube (Ob River estuary. PANGAEA, https://doi.org/10.1594/PANGAEA.761919, Supplement to: Kuptsov, VM; Lisitzin, AP (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
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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.
Median Latitude: 73.910716 * Median Longitude: 73.249048 * South-bound Latitude: 70.918800 * West-bound Longitude: 72.968700 * North-bound Latitude: 75.985000 * East-bound Longitude: 73.518000
DM49-4397-2 * Latitude: 75.985000 * Longitude: 72.968700 * Elevation: -150.0 m * Location: Kara Sea * Campaign: DM49 (SPASIBAIII) * Basis: Dmitry Mendeleev * Device: Gravity corer (GC)
DM49-4414-1 * Latitude: 73.649300 * Longitude: 73.518000 * Elevation: -25.0 m * Location: Kara Sea * Campaign: DM49 (SPASIBAIII) * Basis: Dmitry Mendeleev * Device: Gravity corer (GC)