From glacial erosion to basin overfill: a 240 m-thick overdeepening–fill sequence in Bern, Switzerland
نویسندگان
چکیده
Abstract. We drilled a 210 m-thick succession of Quaternary sediments and extended it 30 m upsection with information that we collected from an adjacent outcrop. In the 240 identified 12 different lithofacies, grouped them into five facies assemblages, distinguished two major sedimentary sequences. A sharp contact at 103 depth cuts off cross-beds in sequence separates overlying horizontal beds B. Although lowermost assemblage each includes till deposited during period ice cover, tills differ other. particular, base is dominated by large clasts derived underlying Molasse bedrock, whereas B has no such components. Furthermore, bears evidence glaciotectonic deformation. Both are overlain thick assemblages subaqueous, most likely glaciolacustrine lacustrine elements. The cross-bedded steeply inclined sand, gravel, diamictic interpreted as deposits density currents subaqueous ice-contact fan system within proglacial lake. contrast, considered to record less energetic environment where material was prodelta setting gradually developed delta plain. Towards top, evolves fluvial recorded C, when sediment fluxes possibly advancing glacier resulted widespread cover region gravel unit. Feldspar luminescence dating on samples sand layer top provided uncorrected ages 250.3 ± 80.2 251.3 59.8 ka. combination these lithostratigraphic correlations sequences encountered neighboring scientific drillings suggests between Marine Isotope Stage 8 (MIS 8; 300–243 ka) MIS 7 (243–191 ka). This depositional age marks end one stage overdeepening–fill perialpine Aare Valley near Bern.
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ژورنال
عنوان ژورنال: Scientific Drilling
سال: 2022
ISSN: ['1816-8957', '1816-3459']
DOI: https://doi.org/10.5194/sd-30-17-2022