The Erbisberg drilling 2011: Implications for the structure and postimpact evolution of the inner ring of the Ries impact crater

Arp, Gernot; Reimer, Andreas; Simon, Klaus; Sturm, Sebastian; Wilk, J.; Kruppa, Corina; Hecht, Lutz; Hansen, Bent; Pohl, J.; Reimold, W. U.; Kenkmann, T.; Jung, Dietmar

doi:10.1111/maps.13293

Cited by 11 publications

(17 citation statements)

References 88 publications

(200 reference statements)

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“…The NR is a mid-sized, almost circular-shaped Miocene lacustrine basin, with a lateral extension of 20 and 24 km in east-west and north-south orientation, respectively. It is situated in western Bavaria 100 km northwest from Munich in the southern German scarplands (Figure 1) (Rullkötter et al, 1990;Arp et al, 2019). The crater lake developed at 14.6 ± 0.2 Ma (Buchner et al, 2010) following a meteorite impact, separating the Swabian and Franconian Albs (Arp et al, 2019).…”

Section: Geological Settingmentioning

confidence: 99%

“…It is situated in western Bavaria 100 km northwest from Munich in the southern German scarplands (Figure 1) (Rullkötter et al, 1990;Arp et al, 2019). The crater lake developed at 14.6 ± 0.2 Ma (Buchner et al, 2010) following a meteorite impact, separating the Swabian and Franconian Albs (Arp et al, 2019). The impact penetrated 600-800 m of Mesozoic to Cenozoic sedimentary rocks, covering a Variscan basement which is constituted by amphibolite, granite and gneiss (Hüttner and Schmidt-Kaler, 1999), without any coherent impact melt sheet reported at the present (Arp et al, 2019).…”

Section: Geological Settingmentioning

confidence: 99%

“…The crater lake developed at 14.6 ± 0.2 Ma (Buchner et al, 2010) following a meteorite impact, separating the Swabian and Franconian Albs (Arp et al, 2019). The impact penetrated 600-800 m of Mesozoic to Cenozoic sedimentary rocks, covering a Variscan basement which is constituted by amphibolite, granite and gneiss (Hüttner and Schmidt-Kaler, 1999), without any coherent impact melt sheet reported at the present (Arp et al, 2019). The penetrated Mesozoic-Cenozoic sediments include Triassic shales, sandstones and evaporites (e.g., gypsum and anhydrite in Keuper succession), Jurassic carbonates, marlstones, shales and sandstones, and a thin section of unconsolidated Neogene sediments on the surface (Mujal and Schoch, 2020).…”

Section: Geological Settingmentioning

confidence: 99%

“…A hydrologically closed lacustrine depositional system (Rothe and Hoefs, 1977;Arp et al, 2014;Christ et al, 2018) formed after the impact, exhibiting an alkaline depositional water body for most of the time and silting up during the late Miocene (Arp et al, 2017;Stüeken et al, 2020). With the rising interests in paleo-environmental archives and post-impact sedimentation processes in general, not only the impact process itself but also the post-impact sequence in the NR became a hot spot for scientific studies lately (e.g., Stöffler et al, 2013;Arp et al, 2014;Sturm et al, 2015;Arp et al, 2017;Christ et al, 2018;Arp et al, 2019;Stüeken et al, 2020;Arp et al, 2021;Zeng et al, 2021). Accordingly, impact dating, pre-impact strata modification and evolution of crater lake chemistry were studied, mainly based on samples from a single borehole.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of organic matter quantity and quality in a warm, hypersaline, alkaline lake: The example of the Miocene Nördlinger Ries impact crater, Germany

et al. 2022

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The Nördlinger Ries (NR) impact crater in southern Germany contains Miocene lacustrine fine-grained post-impact sediments, which were deposited under saline, alkaline, and hydrologically closed aquatic conditions. To obtain information on the organic matter quantity, quality and environmental evolution, samples from one central (NR 1973) and one more marginal (Enkingen SUBO-18) well were analyzed by pyrolytic, organic geochemical and micro-petrographic techniques. Deposits of the marginal drilling can be linked to the thicker stratigraphic units of the well from the lake center based on total organic carbon (TOC), hydrogen index (HI) and lithology. Central deposits contain mainly hydrogen-rich type I kerogen with a mean HI of 447 mg HC/g TOC, whereas the marginal sequence contains type II-III kerogen with an average HI of 206 mg HC/g TOC. In the center, high total sulfur (TS) over TOC ratios of 1.5 on average, and δ13C values of biomarkers in combination with low α-/total MTTC (α-/total methyl-trimethyltridecyl chromans ∼ <0.6) and Pr/Ph ratios <0.2 suggest the prevalence of hypersaline water. Salinity only decreased during deposition of the uppermost Miocene units, when the then shallow alkaline lake turned, at least temporarily, into acidic-neutral conditions during the time of peat deposition. A similar trend, but at overall lower salinities is recorded for the marginal site. Water stratification in the center is stronger than in the marginal domain based on salinity variation. Anoxic bottom water prevailed in the whole lake, as recorded by exceptionally low Pr/Ph ratios (∼<0.2), the occurrence of des-A-lupane and small pyrite framboids (<5 µm) except for the youngest layers of the Miocene lake. Autochthonous, halophilic red algae/plankton prevailed as reflected by abundant C27 steranes, while terrestrial material and aerobic bacteria significantly contributed to the OM only in the latest stages of lake as evident from abundant vitrinite/inertinite particles, high values of diterpenes/C27 sterane (up to 255) as well as low values of C27-29 regular steranes/C29-32 hopanes (<0.5). The same trend, but less well resolved, can be seen at the margin of the paleo-lake.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolution of organic matter quantity and quality in a warm, hypersaline, alkaline lake: The example of the Miocene Nördlinger Ries impact crater, Germany

et al. 2022

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“…Evidence for hydrothermal alteration includes the sericitization of plagioclase and chloritization of biotite in the granite samples UNT-GR and LAN-GR, processes that typically occur at ~150-300 °C (e.g., Jenkin et al, 1992;Parneix et al, 1985). Similar evidence is widespread across Variscan basement lithologies at Ries and interpreted as a postimpact event (e.g., Arp et al, 2019). Schmieder et al (2015) investigated in detail the U-Pb systematics of granular zircon from impact melt rocks from the Acraman impact structure, and notably the possibility for U gain.…”

Section: Monazite and Zircon U-pb Systematicsmentioning

confidence: 88%

U‐Pb dating of zircon and monazite from the uplifted Variscan crystalline basement of the Ries impact crater

Tartèse

Endley

Joy

2022

Meteorit & Planetary Scien

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Impact crater central peaks and peak ring complexes are important exploration targets for future missions to other planetary bodies, because they provide access to material uplifted from lower crustal levels. Material exposed there could also provide chronological constraints on crater formation events. Therefore, it is essential to understand if uplifted peak material preserves the chronological records of igneous and metamorphic protolith crustal rocks, or if such records are reset during impact events. To investigate this issue, we collected shocked gneiss and granite samples from uplifted crystalline basement megablocks in the 24 km diameter Ries impact crater in Germany, which is dated at ~14.8 Ma. Petrographic observations, electron beam imaging, and Raman spectroscopy suggest that these samples record the peak pressures of ~10-15 GPa. In situ U-Pb dating shows that monazite U-Pb systematics have not been affected by the Ries impact, as gneisses and granites yielded monazite U-Pb dates of ~370 and 330 Ma, consistent with known Variscan metamorphic and magmatic events. The U-Pb systematics of some zircon grains yielded U-Pb dates of approximately 5-10 Ma, which is younger than the age of the Ries impact event. These young dates correspond to U-rich metamict domains and may reflect recent Pb loss and/or U-gain during postimpact hydrothermal alteration or weathering. These observations indicate that dating uplifted crystalline material in impact craters on other bodies might provide useful petrological and chronological constraints on the underlying target rocks rather than directly dating impact events, for which sampling impact melt and impact melt-bearing lithologies should remain the primary target.

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Emplacement of shocked basement clasts during crater excavation in the Ries impact structure

Dellefant,

Seybold,

Trepmann

et al. 2024

Int J Earth Sci (Geol Rundsch)

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In the Aumühle quarry of the Ries impact structure, moderately shocked clasts from the Variscan basement occur sandwiched between overlying suevite and components derived from the Mesozoic sedimentary cover of the underlying Bunte Breccia without distinct shock effects. We analyzed the clasts by optical microscopy, scanning electron microscopy (SEM/EDS/EBSD), and Raman spectroscopy to unravel their emplacement relation to the overlying suevite and the sediment-rock clasts of the Bunte Breccia. Clasts sizes range up to few decimeters and are embedded in a fine-grained lithic matrix; no impact-melt fragments are observed. Amphibolite clasts contain maskelynite with few lamellar remnants of feldspar, indicating shock pressures of 28–34 GPa. Amphiboles have cleavage fractures and ($$\overline{1}$$ 1 ¯ 01) mechanical twins suggesting differential stresses > 400 MPa. Felsic gneiss components have optically isotropic SiO2 indicative of shock pressures ≈35 GPa. Metagranite cataclasite clasts contain shocked calcite aggregates and quartz with a high density of fine rhombohedral planar deformation features indicating shock pressures ≈20 GPa. The moderately shocked basement clasts originate from deeper levels of the transient cavity and lower radial distance to the center of the structure compared to the sediment-rock clasts. Both were ballistically ejected during crater excavation. In accordance with palaeo- and rock magnetic data, they were mixed during turbulent deposition at the top of the Bunte Breccia before the emplacement of suevite. The high amount of basement clasts below suevite and on top of the underlying Bunte Breccia is consistent with the commonly reported inverse stratigraphy in the Ries impact structure. Graphical Abstract

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The Erbisberg drilling 2011: Implications for the structure and postimpact evolution of the inner ring of the Ries impact crater

Cited by 11 publications

References 88 publications

Evolution of organic matter quantity and quality in a warm, hypersaline, alkaline lake: The example of the Miocene Nördlinger Ries impact crater, Germany

Evolution of organic matter quantity and quality in a warm, hypersaline, alkaline lake: The example of the Miocene Nördlinger Ries impact crater, Germany

U‐Pb dating of zircon and monazite from the uplifted Variscan crystalline basement of the Ries impact crater

Emplacement of shocked basement clasts during crater excavation in the Ries impact structure

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