Clay mineral distribution in surface sediments


Surface samples from the eastern Barents and south-western Kara seas have been analysed for clay mineralogy. Transport paths, the role of regional sources and local bedrock outcrops and the influence of hydrodynamic and glacigenous processes for clay distribution on the shelves are discussed in relation to central Arctic Ocean deep sea and sea ice sediments. Franz Josef Land and Novaya Zemlya show significantly different clay mineral associations. Although smectite concentrations are fairly high, Franz Josef Land can be excluded as a source for central Arctic sea ice sediments, which are relatively rich in smectite. In the Kara Sea, smectite concentrations in coastal sediments surpass even the Franz Josef Land concentrations. The large cyclonic gyre in the eastern Barents Sea between Novaya Zemlya and Franz Josef Land, which serves as a mixing zone between Arctic and North Atlantic water, is apparently reflected within the smectite distribution pattern. With the exception of Franz Josef Land, the area of investigation is typically low in kaolinite. In particular, coastal areas and areas north of Novaya Zemlya, influenced by the inflow of Arctic waters, show the lowest kaolinite concentrations. A high kaolinite occurrence within the Nansen Basin is most probably related to Franz Josef Land and emphasizes the importance of long-range downslope transport of sediments across the continental slope. The surface water circulation pattern in close interaction with local outcrops onshore Novaya Zemlya and locally restricted occurrences within the eastern Barents Sea significantly alter the illite dispersal pattern. Illite concentrations are lowest around Franz Josef Land. Chlorite is generally low in the area of investigation. Submarine outcrops and important chlorite occurrences onshore Novaya Zemlya bias its distribution pattern.

clay fraction from Dalnie Zelentsy samples (e.g. 180811-1) are <2 micron

Supplement to: Nürnberg, Dirk; Levitan, Mikhail A; Pavlidis, Yury A; Shelekhova, E S (1995): Distribution of clay minerals in surface sediments from the eastern Barents and south-western Kara seas. Geologische Rundschau, 84(3), 665-682

Related Identifier
Metadata Access
Creator Nürnberg, Dirk; Levitan, Mikhail A; Pavlidis, Yury A; Shelekhova, E S
Publisher PANGAEA
Publication Year 1995
Funding Reference Fourth Framework Programme, MAS3980185
Rights Creative Commons Attribution 3.0 Unported;
OpenAccess true
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 540 data points
Discipline Earth System Research
Spatial Coverage (33.547W, 69.297S, 68.167E, 81.118N); off Novaja Zemlya; Velkitsky Bay; Russian Bay; off Franz Joseph Land; Greem Bell Island; Klagenfurt; Chejsa Island; Wiener Neustadt; Camp; Hooker Island; Nordenskiöld Bay; Barents Sea; Kara Sea
Temporal Coverage Begin 1982-01-01T00:00:00Z
Temporal Coverage End 1992-09-01T00:00:00Z