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Datasets of project "Changes in the Geo-Biosphere during the last 15000 years"

Mostrando recursos 1 - 20 de 849

  1. Pollen analysis of sediment core UCK2, Ueckersee, Germany

    Jahns, Susanne

  2. Pollen analysis of sediment core UCK1, Ueckersee, Germany

    Jahns, Susanne

  3. Pollen analysis of sediment core KREB, GroÃYer Krebssee, Germany

    Jahns, Susanne

  4. Pollen analysis of sediment core GKSE, Großer Krebssee, Germany

    Jahns, Susanne

  5. Pollen analysis of sediment core GKSA, Großer Krebssee, Germany

    Jahns, Susanne

  6. Pollen analysis of sediment core FEL2, Felchowsee, Germany

    Jahns, Susanne

  7. Pollen analysis of sediment core FEL1, Felchowsee, Germany

    Jahns, Susanne

  8. Age determination of sediment core GEORGENF, Georgenfelder Hochmoor, Germany

    Stebich, Martina; Litt, Thomas

  9. Pollen profile GEORGENF, Georgenfelder Hochmoor, Germany

    Stebich, Martina; Litt, Thomas

  10. Pollen records from lakes in Mecklenburg, Germany

    Homann, Marion; Merkt, Josef; Müller, Helmut
    The oldest lacustrine sediments of the cores from seven kettle-hole lakes in the Frankfurt Stadium in Mecklen-burg-Vorpommern were deposited during the Alleroed. The dead-ice melted rapidly in the mid-Alleroed. The Laachersee-tephra was found in the lakes east of Lake Müritz, the Saksunarvatn tephra occurred in two lakes. The sediments are generally non-laminated, varves occurred only in isolated sections of a few of these lakes. Relatively high percentages of pine characterize the pollen profiles during the upper part of the Lateglacial. However, the vegetation history shows all the features known from profiles in northwestern Germany. The lower values of hazel towards...

  11. Pollen record from Blankensee, Germany

    Kleinmann, Angelika; Merkt, Josef; Müller, Helmut
    Lake Blankensee is filled with 14 m of late- and postglacial deposits, Lake Siethener See with 22,5 m. The lacustrine sedimentation begins in Lake Siethener See in the middle of the Alleröd with annual lamination which partly continues in the Younger Dryas. A 2 cm thick layer of the Laacher See tephra was found in both lakes, the Saksunarvatn tephra only in Lake Siethener See where the cool Rammelbeek-phase (Preboreal) could be shown. The youngest part of the sediment profiles is suspended drifting mud. Masses of Pediastrum (algae) indicate an increasing shoaling of Lake Blankensee after the Subboreal.

  12. Geochemistry and varves on a sediment profile from Hämelsee, Germany

    Merkt, Josef
    The Alleroed biozone encompasses 625 calendar years. The pollenanalytically determined upper and lower boundary is in good agreement with the development of the microfacies. The study of the macrofacies of annually laminated sediments is a useful tool. It yields not only very accurate varve counts but also paleoclimatological and environmental proxy data. The LST -event occurred 200 years before the Younger Dryas. They exIsts no relationship. However, during ten to twenty years following the LST, the lake deposited sediments similar to those at the beginning of the Younger Dryas, which should be due to comparable meteorological conditions.

  13. Pollen record from Muggesfelder See and Plussee in Germany

    Merkt, Josef; Müller, H H; Knabe, Wolfgang; Müller, Peter; Weiser, Thorolf
    A basaltic tephra layer consisting of brownish-olive glass shards. and about 0.2 mm thick. was found in cores from four lakes in northwest Germany. According to pollen analysis it was deposited during the early Boreal period (corresponding to about 8700 BP). The petrographic properties. the geochemical composition and the age agree with those of the Saksunarvatn tephra. which was first found on the Faroe Islands. The position of the tephra layer in the pollen stratigraphy and in the absolute time-scale is discussed. Procedures for locating the tephra in other cores are suggested.

  14. Age determination of lake Holzmar sediments

    Zolitschka, Bernd; Brauer, Achim; Stockhausen, Hagen; Lang, Andreas; Negendank, Jörg F W
    A record extending back to 23 220 calendar yr B.P. was obtained from varved sediments from Lake Holzmaar, Germany, by applying multiple dating methods and interlake comparison with Meerfelder Maar. Variations in the Weichselian inorganic carbon content resulting from intensified eolian activities coincide with proxy parameters of dust accumulation in Greenland. The timing for the end of the last glacial maximum at Holzmaar agrees with the Greenland Ice Sheet Project (GISP2) data but suggests dating discrepancies with the Greenland Ice Core Project data (GRIP). Assuming that periods of maximum dust deposition in the Eifel and Greenland coincide with ice advances...

  15. (Appendix Table 3) OSL age determination of clastic-rich sediments of core HZM, lake Holzmaar

    Zolitschka, Bernd; Brauer, Achim; Stockhausen, Hagen; Lang, Andreas; Negendank, Jörg F W

  16. (Appendix Table 2) Age control based on radiometric ages of tephra, on thermoluminescence and on paleomagnetic of sediment core HZM, lake Holzmaar

    Zolitschka, Bernd; Brauer, Achim; Stockhausen, Hagen; Lang, Andreas; Negendank, Jörg F W

  17. Age determination of sediment core HZM, lake Holzmar (Tables 1, 2)

    Hajdas, Irena; Zolitschka, Bernd; Ivy-Ochs, Susan D; Beer, Jürg; Bonani, Georges; Leroy, Suzanne A G; Negendank, Jörg F W; Ramrath, Matthias; Suter, Martin
    AMS radiocarbon ages have been determined on terrestrial macrofossils selected from the annually laminated sediments of lake Holzmaar (Germany). The radiocarbon chronology of this lake covers the last 12.6 ka. Comparison of the radiocarbon dated varve chronology with tree ring data shows that an additional 878 years have to be added to the varve chronology. The corrected 14C varve chronology of Holzmaar reaches back to ca. 13.8 ka cal. BP and compares favourably with the results from Soppensee (Switzerland) (Hajdas et al., 1993, doi:10.1007/BF00209748). The corrected ages for the onset and the end of the Younger Dryas biozone are 11,940...

  18. Peat profiles of Lake Faulersee

    Röhrig, Rüdiger; Beug, Hans-Jürgen; Trettin, Rolf; Morgenstern, Peter
    Remains of chironomid larvae from cores of the ancient Lake Faulersee in northern Germany were examined. Pollen, radiocarbon datings, and geochemical data were used to develop the chronology of the Late-Glacial Period in Lake Faulersee and to validate interpretations made by chironomid data. Factors influencing the composition of the subfossil chironomid assemblages were assessed. Our data indicate fluctuations of temperature, lake-level, and trophic state in the Late-Glacial. Furthermore, we explain a discontinuous sequence found in the cores of Lake Faulersee pertaining to a refilling event about 5,800 cal years before present (BP).

  19. (Table 2) Age determination of peat profil FAU_2a

    Röhrig, Rüdiger; Beug, Hans-Jürgen; Trettin, Rolf; Morgenstern, Peter

  20. (Table 2) Age determination of peat profil FAU_1c

    Röhrig, Rüdiger; Beug, Hans-Jürgen; Trettin, Rolf; Morgenstern, Peter

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