A chronological and palaeoenvironmental re‐evaluation of two loess‐palaeosol records in the northern Harz foreland, Germany, based on innovative modelling tools
The continuing development of analytical methods for investigating sedimentary records calls for iterative re‐examination of existing data sets obtained on loess‐palaeosol sequences (LPS) as archives of palaeoenvironmental change. Here, we re‐investigate two LPS (Hecklingen, Zilly) in the northern H...
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ftsubggeo:oai:e-docs.geo-leo.de:11858/8549 2024-06-09T07:46:51+00:00 A chronological and palaeoenvironmental re‐evaluation of two loess‐palaeosol records in the northern Harz foreland, Germany, based on innovative modelling tools Schmidt, Christoph Zeeden, Christian Krauß, Lydia Lehmkuhl, Frank Zöller, Ludwig 1Chair of Geomorphology & BayCEER University of Bayreuth Universitätsstr. 30 Bayreuth 95440 Germany 3Leibniz Institute for Applied Geophysics Stilleweg 2 Hannover 30655 Germany 4Department of Geography RWTH Aachen University Wüllnerstr. 5b Aachen 52056 Germany 6RWTH Aachen University Wüllnerstr. 5b Aachen 52056 Germany 2021-02-04 https://doi.org/10.1111/bor.12510 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8549 eng eng doi:10.1111/bor.12510 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8549 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. ddc:551 Harz foreland loess-palaeosol sequences luminescence ages Bayesian age-depth modelling sedimentation rates doc-type:article 2021 ftsubggeo https://doi.org/10.1111/bor.12510 2024-05-10T04:58:51Z The continuing development of analytical methods for investigating sedimentary records calls for iterative re‐examination of existing data sets obtained on loess‐palaeosol sequences (LPS) as archives of palaeoenvironmental change. Here, we re‐investigate two LPS (Hecklingen, Zilly) in the northern Harz foreland, Germany, being of interest due to their proximity to the Scandinavian Ice Sheet (SIS) and the position between oceanic climatic influence further west and continental influence towards the east. First, we established new quartz OSL and polymineral IRSL chronologies. Both methods show concordant ages in the upper part of the Hecklingen profile (~20–40 ka), but in the lower part IRSL underestimates OSL ages by up to ~15 ka for the period 40–60 ka. Interpretations hence refer to the OSL data set. Second, we applied Bayesian age‐depth modelling to data sets from Hecklingen to resolve inversions in the original ages, also reducing averaged 1σ uncertainty by ~19% (OSL) and ~12% (IRSL). Modelled chronologies point out phases of increased (MIS 2, early MIS 3) and reduced (middle and late MIS 3) sedimentation, but interpretation of numerical rates is problematic because of intense erosion and slope wash particularly during MIS 3. Finally, previously obtained grain‐size data were re‐investigated by end member modelling analyses. Three fundamental grain‐size distributions (loadings) explain the measured data sets and offer information on intensity and – combined with modelled OSL ages – timing of geomorphic processes. We interpret the loadings to represent (i) primary loess accumulation, (ii) postdepositional pedogenesis and/or input of aeolian fine fractions, and (iii) input of coarse aeolian material and/or slope wash. The applied modelling tools facilitate detailed understanding of site‐formation through time, allowing us to correlate a strong peak in mean grain size at ~26–24 ka to the maximum extent of the SIS and increased influence of easterly winds. Deutsche Forschungsgemeinschaft ... Article in Journal/Newspaper Ice Sheet GEO-LEOe-docs (FID GEO) Strong Peak ENVELOPE(-82.300,-82.300,-79.933,-79.933) Boreas 50 3 746 763 |
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English |
topic |
ddc:551 Harz foreland loess-palaeosol sequences luminescence ages Bayesian age-depth modelling sedimentation rates |
spellingShingle |
ddc:551 Harz foreland loess-palaeosol sequences luminescence ages Bayesian age-depth modelling sedimentation rates Schmidt, Christoph Zeeden, Christian Krauß, Lydia Lehmkuhl, Frank Zöller, Ludwig 1Chair of Geomorphology & BayCEER University of Bayreuth Universitätsstr. 30 Bayreuth 95440 Germany 3Leibniz Institute for Applied Geophysics Stilleweg 2 Hannover 30655 Germany 4Department of Geography RWTH Aachen University Wüllnerstr. 5b Aachen 52056 Germany 6RWTH Aachen University Wüllnerstr. 5b Aachen 52056 Germany A chronological and palaeoenvironmental re‐evaluation of two loess‐palaeosol records in the northern Harz foreland, Germany, based on innovative modelling tools |
topic_facet |
ddc:551 Harz foreland loess-palaeosol sequences luminescence ages Bayesian age-depth modelling sedimentation rates |
description |
The continuing development of analytical methods for investigating sedimentary records calls for iterative re‐examination of existing data sets obtained on loess‐palaeosol sequences (LPS) as archives of palaeoenvironmental change. Here, we re‐investigate two LPS (Hecklingen, Zilly) in the northern Harz foreland, Germany, being of interest due to their proximity to the Scandinavian Ice Sheet (SIS) and the position between oceanic climatic influence further west and continental influence towards the east. First, we established new quartz OSL and polymineral IRSL chronologies. Both methods show concordant ages in the upper part of the Hecklingen profile (~20–40 ka), but in the lower part IRSL underestimates OSL ages by up to ~15 ka for the period 40–60 ka. Interpretations hence refer to the OSL data set. Second, we applied Bayesian age‐depth modelling to data sets from Hecklingen to resolve inversions in the original ages, also reducing averaged 1σ uncertainty by ~19% (OSL) and ~12% (IRSL). Modelled chronologies point out phases of increased (MIS 2, early MIS 3) and reduced (middle and late MIS 3) sedimentation, but interpretation of numerical rates is problematic because of intense erosion and slope wash particularly during MIS 3. Finally, previously obtained grain‐size data were re‐investigated by end member modelling analyses. Three fundamental grain‐size distributions (loadings) explain the measured data sets and offer information on intensity and – combined with modelled OSL ages – timing of geomorphic processes. We interpret the loadings to represent (i) primary loess accumulation, (ii) postdepositional pedogenesis and/or input of aeolian fine fractions, and (iii) input of coarse aeolian material and/or slope wash. The applied modelling tools facilitate detailed understanding of site‐formation through time, allowing us to correlate a strong peak in mean grain size at ~26–24 ka to the maximum extent of the SIS and increased influence of easterly winds. Deutsche Forschungsgemeinschaft ... |
format |
Article in Journal/Newspaper |
author |
Schmidt, Christoph Zeeden, Christian Krauß, Lydia Lehmkuhl, Frank Zöller, Ludwig 1Chair of Geomorphology & BayCEER University of Bayreuth Universitätsstr. 30 Bayreuth 95440 Germany 3Leibniz Institute for Applied Geophysics Stilleweg 2 Hannover 30655 Germany 4Department of Geography RWTH Aachen University Wüllnerstr. 5b Aachen 52056 Germany 6RWTH Aachen University Wüllnerstr. 5b Aachen 52056 Germany |
author_facet |
Schmidt, Christoph Zeeden, Christian Krauß, Lydia Lehmkuhl, Frank Zöller, Ludwig 1Chair of Geomorphology & BayCEER University of Bayreuth Universitätsstr. 30 Bayreuth 95440 Germany 3Leibniz Institute for Applied Geophysics Stilleweg 2 Hannover 30655 Germany 4Department of Geography RWTH Aachen University Wüllnerstr. 5b Aachen 52056 Germany 6RWTH Aachen University Wüllnerstr. 5b Aachen 52056 Germany |
author_sort |
Schmidt, Christoph |
title |
A chronological and palaeoenvironmental re‐evaluation of two loess‐palaeosol records in the northern Harz foreland, Germany, based on innovative modelling tools |
title_short |
A chronological and palaeoenvironmental re‐evaluation of two loess‐palaeosol records in the northern Harz foreland, Germany, based on innovative modelling tools |
title_full |
A chronological and palaeoenvironmental re‐evaluation of two loess‐palaeosol records in the northern Harz foreland, Germany, based on innovative modelling tools |
title_fullStr |
A chronological and palaeoenvironmental re‐evaluation of two loess‐palaeosol records in the northern Harz foreland, Germany, based on innovative modelling tools |
title_full_unstemmed |
A chronological and palaeoenvironmental re‐evaluation of two loess‐palaeosol records in the northern Harz foreland, Germany, based on innovative modelling tools |
title_sort |
chronological and palaeoenvironmental re‐evaluation of two loess‐palaeosol records in the northern harz foreland, germany, based on innovative modelling tools |
publishDate |
2021 |
url |
https://doi.org/10.1111/bor.12510 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8549 |
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ENVELOPE(-82.300,-82.300,-79.933,-79.933) |
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Strong Peak |
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Ice Sheet |
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Ice Sheet |
op_relation |
doi:10.1111/bor.12510 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8549 |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_doi |
https://doi.org/10.1111/bor.12510 |
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