High-resolution geochemical record of environmental changes during MIS 3 from the northern Alps (Nesseltalgraben, Germany)

QUATERNARY SCIENCE REVIEWS

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Article

Mayr, Christoph^1,2,3  Stojakowits, Philipp⁴  Lempe, Bernhard⁵  Blaauw, Maarten⁶  Diersche, Volker⁷  Grohganz, Madleen⁸  Correa, Matthias Lopez^8,9  Ohlendorf, Christian¹⁰  Reimer, Paula⁶  Zolitschk, Bernd¹⁰ 

[1] Friedrich Alexander Univ Erlangen Nurnberg, Inst Geog, Wetterkreuz 15, D-91058 Erlangen, Germany

[2] Ludwig Maximilians Univ Munchen, Dept Earth & Environm Sci, Paleontol & Geobiol, Richard Wagner Str 10, D-80333 Munich, Germany

[3] Ludwig Maximilians Univ Munchen, GeoBio Ctr, Richard Wagner Str 10, D-80333 Munich, Germany

[4] Univ Augsburg, Inst Geog, Alter Postweg 118, D-86135 Augsburg, Germany

[5] Tech Univ Munich, Chair Engn Geol, Arcisstr 21, D-80333 Munich, Germany

[6] Queens Univ Belfast, Ctr Climate Environm & Chronol 14CHRONO, Sch Nat & Built Environm, Belfast BT7 1NN, Antrim, North Ireland

[7] Schiller Allee 1, D-83457 Bayerisch Gmain, Germany

[8] Friedrich Alexander Univ Erlangen Nurnberg, GeoZentrum Nordbayern, Loewenichstr 28, D-91054 Erlangen, Germany

[9] CNR, ISMAR, Ist Sci Marine, Via Gobetti 101, I-40129 Bologna, Italy

[10] Univ Bremen, Inst Geog, GEOPOLAR, Celsiusstr 2, D-28359 Bremen, Germany

关键词: Pleistocene;    Paleoclimatology;    Glaciation;    Central Europe;    Dansgaard-Oeschger cycles;    Middle Wurmian;    Lacustrine-palustrine sediment;    Greenland interstadials;    Grain-size analyses;    Radiocarbon dating;   

DOI  :  10.1016/j.quascirev.2019.06.013

来源: Elsevier

【 摘 要 】

Ravine slopes at the recently discovered Nesseltalgraben site in southeastern Germany provide a unique last glacial sediment record for the Northern Calcareous Alps. The 21 m-long profile is dominated by fine-grained lacustrine-palustrine sediments overlain by several metres of glacifiuvial gravels and lodgement tills of the Last Glacial Maximum and underlain by a diamicton. The age model includes 29 radiocarbon analyses and one paleomagnetic anomaly (Laschamp event) together providing a modelled age range from c. 59 to 29.6 ka cal BP, i.e. Marine Isotope Stage (MIS) 3. Apart from a description of the lithofacies, X-ray-fluorescence (XRF) scanning and elemental analyses provide high-resolution records of the geochemical composition. Multivariate analyses of XRF data separate Ca from other major elements. Carbonate contents, represented by Ca and total inorganic carbon, reach maxima in repeatedly occurring calcareous silty to sandy layers and are related to glacigenic origin. These indicate repeated inner-alpine local glaciations during stadials of MIS 3. Scanning electron microscopy and XRF data confirm the detrital origin of these layers. In contrast, organic matter and elements more resistant to chemical weathering (Si, Ti, Zr) accumulated during interstadials and concurrently elevated Rb/Sr ratios indicate intensified weathering. The high-frequency proxy variations determined for Nesseltalgraben reflect interstadialstadial climate variability comparable with oxygen-isotope records from Greenland ice cores and Alpine speleothems. Thus, Nesseltalgraben is among the very few independently dated sediment records from continental Europe covering the entire MIS 3 and reflecting the full Dansgaard-Oeschger climate variability. (C) 2019 Elsevier Ltd. All rights reserved.

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