Forschungsbohrung Garding 2011 – das Quartär in Norddeutschland

Manfred Frechen1, Christel Adams2, Hermann Buness3, Alf Grube4, Christian Rolf3, Frank Sirocko2, Brigitte Urban5, Helga Wiederhold3, Thoma Wonik3, Jingran Zhang
1 LIAG Geochronologie und Isotopenhydrologie, Leibniz-Institut für Angewandte Geophysik
2 Univ. Mainz
4 LLUR Flintbeck
5 LEUPHANA Lüneburg

V 1.8 in Fortschritte der Quartärstratigraphie

17.09.2012, 14:30-14:50, H8

The “Garding Tertiary Trough” located on the Eiderstedt peninsula in Schleswig-Holstein, North Germany records a terrestrial sediment archive of extraordinary importance for the Pliocene-Pleistocene time period and for stratigraphic correlations in Northern and Central Europe. The trough developed as a rim syncline of the salt diapir Oldenswort accumulating the thickest and most complete Cenozoic sediment succession in superposition in Northern Germany. The scientific drilling was funded by the annual drilling program of the Leibniz Institute for Applied Geophysics (LIAG). The multidisciplinary approach includes methods of applied geophysics, geology, sedimentology, and palynology. At present, the core material is under investigation in the frame of three PhD projects: sedimentology and facies analysis (University of Mainz), palynology and palaeoecological changes (University of Lüneburg), and a detailed chronological framework by means of optical stimulated luminescence (OSL) and radiocarbon dating as well as rockmagnetic studies (LIAG). Furthermore, the sediment cores are lithologically and petrographically investigated at LLUR in Flintbek. Prior to the research drilling, extended geophysical studies were carried out including seismics and airborne electromagnetics (SkyTEM). Detailed borehole geophysics was carried out in the 239 m deep borehole, and the magnetic susceptibility of the core was scanned. The quality of the core material is excellent. First lithostratigraphic investigations reveal the following preliminary interpretation of the sediment sequence: thick (≥20m) Holocene deposits, Weichselian and Saalian deposits, Drenthian till, thick organic-rich sediments of early Saalian to Holsteinian age, Elsterian Till, a thick and very detailed series of Early Pleistocene deposits including several organic-rich horizons (interstadials/interglacials), an extended sequence of Early Pleistocene to Pliocene sandy deposits (the Pliocene/Pleistocene boundary is tentatatively defined at a depth of 180 m in the borehole), and fine to coarse-grained sandy deposits including thin lignite layers correlating to the Pliocene/Miocene.

The aims of the Garding Drilling Project are to study the geological evolution of the Garding Trough and to reconstruct the Quaternary climate and vegetation history in detail. Some of the key issues are the correlation of NW European Pleistocene stratigraphic record with the Alpine record from Southern Germany by setting up a more reliable chronological framework, the subdivision of the Saalian and Cromerian Complex, palaeoecological changes during MIS 15-11 and especially the Lower Pleistocene record, as well as the coastal evolution and landscape changes during the Holocene.

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Letzte Änderung 08.08.2012