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Carbonate sedimentation in the northern North Atlantic since the late Pliocene

By R. Huber

Abstract

This thesis addresses the imprint of surface water and deep water paleocirculation on pelagic carbonate sedimentology at the high latitude North Atlantic since the late Pliocene. Micropaleontological and sedimentological analyses were performed on both, sediment cores and surface samples from sites in the northern North Atlantic. The results allow implications for the paleoceanography and paleoclimate of this oceanic realm. Special attention was paid to the paleoecology of polar planktonic foraminifers and their preservational potential on the sea floor. A methodical preparatory study presents results from coarse fraction analysis carried out on the >150-#mu#m as well as on the 125-500-#mu#m fraction. Census data are compared in order to test the compatibility between these two methods. There is a generally good comparability of the two methods but IRD (ice rafted debris) data show some differences in detail. A slight underestimation of small, subpolar planktonic foraminifers is evident in the census data of the >150 #mu#m fraction. In general, however, also planktonic foraminifer census data are in good agreement between the two methods. A carbonate dissolution study on surface sediments reveals very good carbonate preservation along the inflow of warm Atlantic surface water and in the northernmost parts of the Norwegian-Greenland Sea. Higher dissolution can be found along Greenland and Norwegian contintential margin and in the deepest parts of the Greenland Basin. Only in the deepest parts of the Norwegian-Greenland Sea carbonate dissolution is influenced by deep water mass properties. Supralysoklinal dissolution is mot important for recent carbonate dissolution in the Norwegian Greenland Sea. (orig.)SIGLEAvailable from TIB Hannover: RO 7630(140) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Topics: 08A - Oceanography
Year: 1999
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Provided by: OpenGrey Repository
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