Geochemistry of surface sediments from the mid-oceanic Kolbeinsey Ridge, north of Iceland

Lackschewitz, Klas, Wallrabe-Adams, H.-J. and Garbe-Schönberg, Dieter (1994) Geochemistry of surface sediments from the mid-oceanic Kolbeinsey Ridge, north of Iceland Marine Geology, 121 (1-2). pp. 105-119. DOI 10.1016/0025-3227(94)90160-0.

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In order to assess recent submarine volcanic contributions to the sediments from the active Kolbeinsey Ridge, surface samples were analyzed chemically. The contribution of major and trace elements studied differ within the study area.

A statistical analysis of the geochemical variables using factor analysis and cluster method allows to distinguish possible sample groups. Cluster method identifies three distinct sediment groups located in different areas of sedimentation.

Group 1 is characterized by highest contents of Fe2O3, V, Co, Ni, Cu and Zn demonstrating the input of volcaniclastic material. Group 2 comprises high values of CaCO3, CaO and Sr representing biogenic carbonate. Group 3 is characterized by the elements K, Rb, Cs, La and Pb indicating the terrigenous component.

The absolute percentage of the volcanic, biogenic and terrigenous components in the bulk sediments was calculated by using a normative sediment method. The highest volcanic component (> 60% on a carbonate free basis) is found on the ridge crest. The biogenic component is highest (10–30%) in the eastern part of the Spar Fracture Zone influenced by the East Iceland Current. Samples from the western and southeastern region of the study area contain more than 90% of terrigenous component which appears to be mainly controlled by input of ice-rafted debris.

Document Type: Article
Keywords: Geochemistry; Surface sediments; Kolbeinsey Ridge; Iceland; RV Poseidon; POS158; RV Polarstern; ARK V/1
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Kiel University
Refereed: Yes
DOI etc.: 10.1016/0025-3227(94)90160-0
ISSN: 0025-3227
Projects: The Greenland-Scotland-Ridge
Date Deposited: 23 Feb 2016 14:30
Last Modified: 21 Mar 2018 12:34

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