Drilling Overdeepened Alpine Valleys (ICDP-DOVE): quantifying the age, extent, and environmental impact of Alpine glaciations
<p>The sedimentary infill of glacially overdeepened valleys (i.e., structures eroded below the fluvial base level) is an excellent but yet underexplored archive with regard to the age, extent, and nature of past glaciations. The ICDP project DOVE (Drilling Overdeepened Alpine Valleys) Phase 1...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2022-10-01
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| Series: | Scientific Drilling |
| Online Access: | https://sd.copernicus.org/articles/31/51/2022/sd-31-51-2022.pdf |
| _version_ | 1797989583991865344 |
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| author | F. S. Anselmetti M. Bavec C. Crouzet M. Fiebig G. Gabriel G. Gabriel F. Preusser C. Ravazzi |
| author_facet | F. S. Anselmetti M. Bavec C. Crouzet M. Fiebig G. Gabriel G. Gabriel F. Preusser C. Ravazzi |
| author_sort | F. S. Anselmetti |
| collection | DOAJ |
| description | <p>The sedimentary infill of glacially overdeepened valleys
(i.e., structures eroded below the fluvial base level) is an excellent but
yet underexplored archive with regard to the age, extent, and nature of past glaciations. The ICDP project DOVE (Drilling Overdeepened Alpine Valleys) Phase 1 investigates a series of drill cores from glacially overdeepened troughs at several locations along the northern front of the Alps. All sites
will be investigated with regard to several aspects of environmental
dynamics during the Quaternary, with focus on the glaciation, vegetation,
and landscape history. Geophysical methods (e.g., seismic surveys), for
example, will explore the geometry of overdeepened structures to better
understand the process of overdeepening. Sedimentological analyses combined
with downhole logging, analysis of biological remains, and state-of-the-art
geochronological methods, will enable us to reconstruct the erosion and
sedimentation history of the overdeepened troughs. This approach is expected
to yield significant novel data quantifying the extent and timing of Middle
and Late Pleistocene glaciations of the Alps. In a first phase, two sites
were drilled in late 2021 into filled overdeepenings below the
paleolobe of the Rhine Glacier, and both recovered a trough filling composed
of multiphase glacial sequences. Fully cored Hole 5068_1_C reached a depth of 165 m and recovered 10 m molasse bedrock at the base. This hole will be used together with two flush holes (5068_1_A, 5068_1_B) for further geophysical cross-well experiments. Site 5068_2 reached a depth of 255 m
and bottomed out near the soft rock–bedrock contact. These two sites are
complemented by three legacy drill sites that previously recovered filled
overdeepenings below the more eastern Alpine Isar-Loisach, Salzach, and Traun paleoglacier lobes (5068_3, 5068_4, 5068_5). All analysis and
interpretations of this DOVE Phase 1 will eventually lay the ground for an
upcoming Phase 2 that will complete the pan-Alpine approach. This follow-up
phase will investigate overdeepenings formerly occupied by paleoglacier
lobes from the western and southern Alpine margins through drilling sites in France, Italy, and Slovenia. Available geological information and
infrastructure make the Alps an ideal area to study overdeepened structures;
however, the expected results of this study will not be restricted to the
Alps. Such features are also known from other formerly glaciated mountain
ranges, which are less studied than the Alps and more problematic with
regards to drilling logistics. The results of this study will serve as
textbook concepts to understand a full range of geological processes
relevant to formerly glaciated areas all over our planet.</p> |
| first_indexed | 2024-04-11T08:22:48Z |
| format | Article |
| id | doaj.art-bff93b0292ab46f89c33f675af819daf |
| institution | Directory Open Access Journal |
| issn | 1816-8957 1816-3459 |
| language | English |
| last_indexed | 2024-04-11T08:22:48Z |
| publishDate | 2022-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Scientific Drilling |
| spelling | doaj.art-bff93b0292ab46f89c33f675af819daf2022-12-22T04:34:52ZengCopernicus PublicationsScientific Drilling1816-89571816-34592022-10-0131517010.5194/sd-31-51-2022Drilling Overdeepened Alpine Valleys (ICDP-DOVE): quantifying the age, extent, and environmental impact of Alpine glaciationsF. S. Anselmetti0M. Bavec1C. Crouzet2M. Fiebig3G. Gabriel4G. Gabriel5F. Preusser6C. Ravazzi7Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, 3012 Bern, SwitzerlandGeological Survey of Slovenia, 1000 Ljubljana, SloveniaDepartment of Geology, Université Savoie Mont Blanc, Université Grenoble Alpes, CNRS, IRD, ISTerre, Chambéry, FranceDepartment of Civil Engineering and Natural Hazards, Institute of Applied Geology, University of Natural Resources and Life Sciences, Vienna (BOKU), 1190 Vienna, AustriaDepartment 1: Seismics, Gravimetry & Magnetics, Leibniz Institute for Applied Geophysics, 30655 Hanover, GermanyInstitute of Geology, Leibniz University Hanover, 30167 Hanover, GermanyInstitute of Earth and Environmental Sciences, University of Freiburg, 79104 Freiburg, GermanyCNR – Institute of Environmental Geology and Geoengineering (IGAG), 20126 Milan, Italy<p>The sedimentary infill of glacially overdeepened valleys (i.e., structures eroded below the fluvial base level) is an excellent but yet underexplored archive with regard to the age, extent, and nature of past glaciations. The ICDP project DOVE (Drilling Overdeepened Alpine Valleys) Phase 1 investigates a series of drill cores from glacially overdeepened troughs at several locations along the northern front of the Alps. All sites will be investigated with regard to several aspects of environmental dynamics during the Quaternary, with focus on the glaciation, vegetation, and landscape history. Geophysical methods (e.g., seismic surveys), for example, will explore the geometry of overdeepened structures to better understand the process of overdeepening. Sedimentological analyses combined with downhole logging, analysis of biological remains, and state-of-the-art geochronological methods, will enable us to reconstruct the erosion and sedimentation history of the overdeepened troughs. This approach is expected to yield significant novel data quantifying the extent and timing of Middle and Late Pleistocene glaciations of the Alps. In a first phase, two sites were drilled in late 2021 into filled overdeepenings below the paleolobe of the Rhine Glacier, and both recovered a trough filling composed of multiphase glacial sequences. Fully cored Hole 5068_1_C reached a depth of 165 m and recovered 10 m molasse bedrock at the base. This hole will be used together with two flush holes (5068_1_A, 5068_1_B) for further geophysical cross-well experiments. Site 5068_2 reached a depth of 255 m and bottomed out near the soft rock–bedrock contact. These two sites are complemented by three legacy drill sites that previously recovered filled overdeepenings below the more eastern Alpine Isar-Loisach, Salzach, and Traun paleoglacier lobes (5068_3, 5068_4, 5068_5). All analysis and interpretations of this DOVE Phase 1 will eventually lay the ground for an upcoming Phase 2 that will complete the pan-Alpine approach. This follow-up phase will investigate overdeepenings formerly occupied by paleoglacier lobes from the western and southern Alpine margins through drilling sites in France, Italy, and Slovenia. Available geological information and infrastructure make the Alps an ideal area to study overdeepened structures; however, the expected results of this study will not be restricted to the Alps. Such features are also known from other formerly glaciated mountain ranges, which are less studied than the Alps and more problematic with regards to drilling logistics. The results of this study will serve as textbook concepts to understand a full range of geological processes relevant to formerly glaciated areas all over our planet.</p>https://sd.copernicus.org/articles/31/51/2022/sd-31-51-2022.pdf |
| spellingShingle | F. S. Anselmetti M. Bavec C. Crouzet M. Fiebig G. Gabriel G. Gabriel F. Preusser C. Ravazzi Drilling Overdeepened Alpine Valleys (ICDP-DOVE): quantifying the age, extent, and environmental impact of Alpine glaciations Scientific Drilling |
| title | Drilling Overdeepened Alpine Valleys (ICDP-DOVE): quantifying the age, extent, and environmental impact of Alpine glaciations |
| title_full | Drilling Overdeepened Alpine Valleys (ICDP-DOVE): quantifying the age, extent, and environmental impact of Alpine glaciations |
| title_fullStr | Drilling Overdeepened Alpine Valleys (ICDP-DOVE): quantifying the age, extent, and environmental impact of Alpine glaciations |
| title_full_unstemmed | Drilling Overdeepened Alpine Valleys (ICDP-DOVE): quantifying the age, extent, and environmental impact of Alpine glaciations |
| title_short | Drilling Overdeepened Alpine Valleys (ICDP-DOVE): quantifying the age, extent, and environmental impact of Alpine glaciations |
| title_sort | drilling overdeepened alpine valleys icdp dove quantifying the age extent and environmental impact of alpine glaciations |
| url | https://sd.copernicus.org/articles/31/51/2022/sd-31-51-2022.pdf |
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