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Dive into the research topics where Tanja Kuhnt is active.

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Featured researches published by Tanja Kuhnt.


Journal of Micropalaeontology | 2011

Repeated bottom-water oxygenation during OAE 2: timing and duration of short-lived benthic foraminiferal repopulation events (Wunstorf, northern Germany)

Oliver Friedrich; Silke Voigt; Tanja Kuhnt; Mirjam C Koch

Published proxy data for Oceanic Anoxic Event 2 (OAE 2 or Cenomanian–Turonian Boundary Event) and other mid-Cretaceous OAEs indicate widespread anoxic bottom-water conditions. However, increasing evidence shows that anoxia was not permanent but subject to significant fluctuations. We have generated X-ray fluorescence elemental concentration and benthic foraminiferal assemblage records for a short section of OAE 2 black shales from Wunstorf, northern Germany. Two intervals of low sulphur elemental concentration are interpreted as periods of increased oxygenation of bottom waters. This is supported by benthic foraminiferal assemblage data showing repopulation events associated with these intervals. These repopulation events are characterized mainly by the occurrence of agglutinated taxa, with Lingulogavelinella globosa being the only abundant calcareous species. This observation is interpreted in terms of short-term interruptions of the otherwise anoxic bottom-water environment. Comparison with repopulation events during OAE 1b and Quaternary sapropels make it reasonable to speculate that short-term cooling and an associated increase in bottom-water ventilation at the NW European shelf sea are the main trigger mechanisms for the observed repopulation events at Wunstorf. As source area for benthic foraminifera, shallower parts of the Lower Saxony basin are proposed. Supplementary material: XRF elemental concentrations and benthic foraminiferal counts, are available at: http://www.geolsoc.org.uk/SUP18496


Marine Geology | 2008

Sedimentation processes in the Eastern Mediterranean Sea during the Late Glacial and Holocene revealed by end-member modelling of the terrigenous fraction in marine sediments

Yvonne Hamann; Werner Ehrmann; Gerhard Schmiedl; Stefan Krüger; Jan-Berend W Stuut; Tanja Kuhnt


Palaeogeography, Palaeoclimatology, Palaeoecology | 2007

Clay minerals in late glacial and Holocene sediments of the northern and southern Aegean Sea

Werner Ehrmann; Gerhard Schmiedl; Yvonne Hamann; Tanja Kuhnt; Christoph Hemleben; Wolfgang Siebel


Quaternary Science Reviews | 2010

Climatic forcing of eastern Mediterranean deep-water formation and benthic ecosystems during the past 22 000 years

Gerhard Schmiedl; Tanja Kuhnt; Werner Ehrmann; Kay-Christian Emeis; Yvonne Hamann; Ulrich Kotthoff; Peter Dulski; Joerg Pross


Marine Micropaleontology | 2007

Deep-sea ecosystem variability of the Aegean Sea during the past 22 kyr as revealed by Benthic Foraminifera

Tanja Kuhnt; Gerhard Schmiedl; Werner Ehrmann; Yvonne Hamann; Christoph Hemleben


Quaternary Research | 2009

Modern and late Quaternary clay mineral distribution in the area of the SE Mediterranean Sea

Yvonne Hamann; Werner Ehrmann; Gerhard Schmiedl; Tanja Kuhnt


Palaeogeography, Palaeoclimatology, Palaeoecology | 2008

Stable isotopic composition of Holocene benthic foraminifers from the Eastern Mediterranean Sea: Past changes in productivity and deep water oxygenation

Tanja Kuhnt; Gerhard Schmiedl; Werner Ehrmann; Yvonne Hamann; Nils Andersen


International Journal of Earth Sciences | 2007

Distribution of clay minerals in surface sediments of the Aegean Sea: a compilation

Werner Ehrmann; Gerhard Schmiedl; Yvonne Hamann; Tanja Kuhnt


EPIC3Deep-Sea Research Part I-Oceanographic Research Papers, PERGAMON-ELSEVIER SCIENCE LTD, 76, pp. 85-95, ISSN: 0967-0637 | 2013

Relationship between pore density in benthic foraminifera and bottom-water oxygen content

Tanja Kuhnt; Oliver Friedrich; Gerhard Schmiedl; Yvonne Milker; Andreas Mackensen; Andreas Lückge


Archive | 2009

Modern and late Quaternary clay mineral distribution in the area of the SE

Yvonne Hamann; Werner Ehrmann; Gerhard Schmiedl; Tanja Kuhnt

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Andreas Mackensen

Alfred Wegener Institute for Polar and Marine Research

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