Citation:

PANGAEA.733566, Supplement to: Stein, R et al. (1999): Late quaternary organic carbon and biomarker records from the Laptev Sea continental margin (Arctic Ocean): implications for organic carbon flux and composition. In: Kassens, H; Bauch, H A; Dmitrenko, I A; Eicken, H; Hubberten, H-W; Melles, M; Thiede, J & Timokhov, L A (eds.), Land-ocean systems in the Siberian Arctic: dynamics and history, Springer, Berlin, Heidelberg, 635-656

Name: Organic carbon and biomarker record from the Laptev Sea continental margin
Published: 1999
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

In order to understand the processes controlling organic carbon deposition (i.e., primary productivity vs. terrigenous supply) and their paleoceanographic significance, three sediment cores (PS2471, PS2474. and PS2476) from the Laptev Sea continental margin were investigated for their content and composition of organic carbon. The characterization of organic matter indudes the determination of buk parameters (hydrogen index values and C/N ratios) and the analysis of specific biomarkers (n-alaknes, fatty acids, alkenones, and pigments).

Total organic carbon (TOC) values vary between 0.3 and 2%. In general, the organic matter from the Laptev Sea continental margin is dominated by terrigenous matter throughout. However. significant amounts of marine organic carbon occur. The turbidites, according to a still preliminary stratigraphy probably deposited during glacial Oxygen Isotope Stages 2 and 4, are characterized by maximum amounts of organic carbon of terrigenous origin. Marine organic carbon appears to show enhanced relative abundances in the Termination I (?) and early Holocene time intervals, as indicated by maximum amounts of short chain n-alkanes, short-chain fatty acids, and alkenones. The increased amounts of faity acids, however, may also have a freshwater origin due to increased river discharge at that time. The occurrence of alkenones is suggested to indicate an intensification of Atlantic water inflow along the Eurasian continental margin starting at that time.

Oxygen Isotope Stage l accumutation rates of total organic carhon are 0.3, 0.17, and 0.02 C/cm**2/ky in cores PS2476, PS2474, and PS2471, respectively.

Project(s):

Paleoenvironmental Reconstructions from Marine Sediments @ AWI (AWI_Paleo)

Quaternary Environment of the Eurasian North (QUEEN)

Funding:

Fourth Framework Programme (FP4), grant/award no. MAS3980185 : Quaternary Environment of the Eurasian North

Coverage:

Median Latitude: 79.152219 * Median Longitude: 111.804005 * South-bound Latitude: 77.390000 * West-bound Longitude: 59.215000 * North-bound Latitude: 87.589800 * East-bound Longitude: 119.793330

Date/Time Start: 1991-08-13T00:00:00 * Date/Time End: 1993-09-17T00:00:00

Event(s):

PS2163-4 (PS19/157) * Latitude: 86.241800 * Longitude: 59.215000 * Date/Time: 1991-08-13T00:00:00 * Elevation: -3040.0 m * Penetration: 0.4 m * Recovery: 0.28 m * Location: Gakkel Ridge, Arctic Ocean * Campaign: (PS19 ARCTIC91) * Basis: * Method/Device: Kasten corer (KAL) * Comment: harte Lage im CC, verbogen

PS2170-3 (PS19/165) * Latitude: 87.589800 * Longitude: 60.765800 * Date/Time: 1991-08-18T00:00:00 * Elevation: -4226.0 m * Penetration: 11.51 m * Recovery: 11.57 m * Location: Amundsen Basin * Campaign: (PS19 ARCTIC91) * Basis: * Method/Device: Giant piston corer (GPC) * Comment: 13 core sections: 0-0.18, 0.18-1.16, 1.16-2.17, 2.17-3.19, 3.19-4.21, 4.21-5.22, 5.22-6.26, 6.26-7.25, 7.25-8.29, 8.29-9.31, 9.31-10.32, 10.32-11.34, 11.34-11.57 m; TWC: 76 cm

PS2471-4 (PS27/054) * Latitude: 79.151660 * Longitude: 119.793330 * Date/Time: 1993-09-13T00:00:00 * Elevation: -3047.0 m * Penetration: 6 m * Recovery: 4.16 m * Location: Laptev Sea * Campaign: (PS27) * Basis: * Method/Device: Gravity corer (Kiel type) (SL) * Comment: 5 core sections: 0-0.16, 0.16-1.16, 1.16-2.16, 2.16-3.16, 3.16-4.16 m

Comment:

For susceptibility records see Nürnberg et al. (1995) dataset: doi:10.1594/PANGAEA.733565

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)