Linsel, A. ; Hornung, Jens ; Bär, K. ; Hinderer, Matthias (2015)
Well-logs beneath Messel penetrating the post-Variscan unconformity (Sprendlinger Horst).
Geo Berlin 2015. Berlin (04.10.-07.10.2015)
Conference or Workshop Item
Abstract
The post-Variscan unconformity constitutes a significant horizon which is relevant for diverse geological questions in Europe. Locally-dependant sediments and volcanic rocks are unconformably overlying the basement of Variscan age which was more or less extensively exposed to weathering processes. Petrophysical, mineralogical and geochemical properties change abruptly within a short interval. Hence, this horizon controls geo- logical issues significantly e.g. in groundwater or geothermal models, disposal sites or engineering- geological questions. Although prominently developed over Europe and exposed widespread, weathering and sedimentary processes are rarely studied at the post-Variscan unconformity so far. This contribution presents first studies on the drilling core “Forschungsbohrung Messel GA 1” which is penetrating the post-Variscan unconformity on the Sprendlinger Horst. 20 meters of sedimentary and volcanic rocks are unconformably overlying the Variscan plutonic basement. Twelve sedimentary and three magmatic lithofacies can be distinguished. The sedimentary lithofacies were classified with the help of sedimentary structures like massive, planar cross, trough cross and horizontal bedding or lamination. The grain sizes of the sedimentary rocks vary from clay/fine silt up to medium gravel. Afterwards, detailed profiles and a lithofacies catalog of the sedimentary rocks were generated, supplemented and interpreted with the help of porosity and permeability data. At this stage, the sedimentary rocks were interpreted as continental medial alluvial-fan deposits in a semi-arid environment with ephemeral streams and mudflows. The magmatic bed rock represents quartz monzodiorite which shows only weak weathering/alteration at the surface. Other studies of drilling cores and in an active quarry, where the post-Variscan unconformity is well exposed, will be done to analyze the spatial heterogeneity of weathering and sedimentation.
| Item Type: | Conference or Workshop Item |
|---|---|
| Erschienen: | 2015 |
| Creators: | Linsel, A. ; Hornung, Jens ; Bär, K. ; Hinderer, Matthias |
| Type of entry: | Bibliographie |
| Title: | Well-logs beneath Messel penetrating the post-Variscan unconformity (Sprendlinger Horst). |
| Language: | English |
| Date: | 4 October 2015 |
| Place of Publication: | Berlin |
| Book Title: | DYNAMIC EARTH · from Alfred Wegener to today and beyond |
| Event Title: | Geo Berlin 2015 |
| Event Location: | Berlin |
| Event Dates: | 04.10.-07.10.2015 |
| URL / URN: | http://www.geoberlin2015.de/assets/book_of_abstracts_geoberl... |
| Abstract: | The post-Variscan unconformity constitutes a significant horizon which is relevant for diverse geological questions in Europe. Locally-dependant sediments and volcanic rocks are unconformably overlying the basement of Variscan age which was more or less extensively exposed to weathering processes. Petrophysical, mineralogical and geochemical properties change abruptly within a short interval. Hence, this horizon controls geo- logical issues significantly e.g. in groundwater or geothermal models, disposal sites or engineering- geological questions. Although prominently developed over Europe and exposed widespread, weathering and sedimentary processes are rarely studied at the post-Variscan unconformity so far. This contribution presents first studies on the drilling core “Forschungsbohrung Messel GA 1” which is penetrating the post-Variscan unconformity on the Sprendlinger Horst. 20 meters of sedimentary and volcanic rocks are unconformably overlying the Variscan plutonic basement. Twelve sedimentary and three magmatic lithofacies can be distinguished. The sedimentary lithofacies were classified with the help of sedimentary structures like massive, planar cross, trough cross and horizontal bedding or lamination. The grain sizes of the sedimentary rocks vary from clay/fine silt up to medium gravel. Afterwards, detailed profiles and a lithofacies catalog of the sedimentary rocks were generated, supplemented and interpreted with the help of porosity and permeability data. At this stage, the sedimentary rocks were interpreted as continental medial alluvial-fan deposits in a semi-arid environment with ephemeral streams and mudflows. The magmatic bed rock represents quartz monzodiorite which shows only weak weathering/alteration at the surface. Other studies of drilling cores and in an active quarry, where the post-Variscan unconformity is well exposed, will be done to analyze the spatial heterogeneity of weathering and sedimentation. |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Earth Science 11 Department of Materials and Earth Sciences > Earth Science > Applied Sedimentary Geology |
| Date Deposited: | 25 Jan 2016 22:24 |
| Last Modified: | 29 May 2016 21:18 |
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