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Source and grain-size influences upon the clay mineral distribution in the Skagerrak and northern Kattegat

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Abstract:

Bottom sediments from 78 sites in the Skagerrak-Kattegat area have been used to determine the semi-quantitative distribution of clay minerals, and to interpret sediment provenance and the transport pathways. The sediment reflects incorporation of four sources, affected both by earlier glacial processes and on-going marine mixing. The southern North Sea, characterized by dioctaheadral illite, kaolinite and smectite, is the dominating source. The central North Sea provides a limited, but significant, source for chlorite. The sediment from the Swedish west coast has an unweathered character, containing trioctaheadral illite, vermiculite, illite-vermiculite mixed-layer minerals and chlorite. The contribution from the southern Kattegat (southern Sweden and Denmark) is dominated by kaolinite and smectite. Correlation between clay content and the contents of smectite, kaolinite and chlorite in the Skagerrak indicate that the clay mineral distribution is influenced by sorting. This grain-size dependency must be considered when interpreting sources.

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/000985598545381

Affiliations: Department of Geology, Earth Sciences Centre, Go ┬Ęteborg University, Box 460, S-40530 Go ┬Ęteborg, Sweden

Publication date: March 1, 1998

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