Not logged in
Data Publisher for Earth & Environmental Science

Friedrich, Oliver; Herrle, Jens O; Hemleben, Christoph (2005): Micropaleontological investigation of sediment core Kronsmoor. PANGAEA,, Supplement to: Friedrich, O et al. (2005): Climatic changes in the Late Campanian through Early Maastrichtian: micropaleontological and stable isotopic evidence from an epicontinental sea. Journal of Foraminiferal Research, 35(3), 228-247,

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Benthic foraminiferal and calcareous nannofossil assemblages, as well as stable isotope data from the Campanian/Maastrichtian boundary interval (~71.4 to ~70.7 Ma) of the Kronsmoor section (North German Basin), were investigated in order to characterize changes in surface-water productivity and oxygen content at the seafloor and their link to climatic and paleoceanographic changes. A nutrient index based on calcareous nannofossils is derived for the high-latitude, epicontinental North German Basin, reflecting changes in surface-water productivity. Oxygen isotopes of well-preserved planktic foraminiferal specimens of Heterohelix globulosa reflect warmer surface-water temperatures in the lower part of the studied succession and a cooling of up to 2°C (0.5 per mil) in the upper part (after 71.1 Ma). For the lower and warmer part of the investigated succession, benthic foraminiferal assemblages and the calcareous nannofossils indicate well-oxygenated bottom waters and low-surface water productivity. In contrast, the upper part of the succession is characterized by cooler conditions, lower oxygen content at the seafloor and increasing surface-water productivity. It is proposed that the cooling phase starting at 71.1 Ma was accompanied by increasing surface-water mixing caused by westerly winds. As a consequence of mixing, nutrients were advected from sub-surface waters into the mixed layer, resulting in increased surface-water productivity and enhanced organic matter flux to the seafloor. We hypothesize that global sea-level fall during the earliest Maastrichtian (~71.3 Ma), indicated by decreasing carbon isotope values, may have led to a weaker water mass exchange through narrower gateways between the Boreal Realm and the open North Atlantic and Tethys oceans. Both the weaker water mass exchange and enhanced surface-water productivity may have led to slightly less ventilated bottom waters of the upper part of the studied section. Our micro-paleontological and stable isotopic approach indicates short-term (<100 kyr) changes in oxygen consumption at the seafloor and surface-water productivity across the homogeneous Boreal White Chalk succession of the North German Basin.
Date/Time Start: 2000-09-01T12:00:00 * Date/Time End: 2000-09-01T12:00:00
Kronsmoor * Latitude: 53.900000 * Longitude: 9.580000 * Date/Time: 2000-09-01T12:00:00 * Elevation: 20.0 m * Location: Germany, North * Device: Multiple investigations (MULT)
Project: Kuehlokrei
6 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text (use the following character encoding: )