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Well-logs beneath Messel penetrating the post-Variscan unconformity (Sprendlinger Horst).

Linsel, A. and Hornung, Jens and Bär, K. and Hinderer, Matthias (2015):
Well-logs beneath Messel penetrating the post-Variscan unconformity (Sprendlinger Horst).
In: DYNAMIC EARTH · from Alfred Wegener to today and beyond, Berlin, In: Geo Berlin 2015, Berlin, 04.10.-07.10.2015, [Online-Edition: http://www.geoberlin2015.de/assets/book_of_abstracts_geoberl...],
[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. and Hornung, Jens and Bär, K. and Hinderer, Matthias
Title: Well-logs beneath Messel penetrating the post-Variscan unconformity (Sprendlinger Horst).
Language: English
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.

Title of Book: DYNAMIC EARTH · from Alfred Wegener to today and beyond
Place of Publication: Berlin
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
Event Title: Geo Berlin 2015
Event Location: Berlin
Event Dates: 04.10.-07.10.2015
Date Deposited: 25 Jan 2016 22:24
Official URL: http://www.geoberlin2015.de/assets/book_of_abstracts_geoberl...
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