ResponseResponse to comment on “A high-precision 40Ar/39Ar age for the Nördlinger Ries impact crater, Germany, and implications for the accurate dating of terrestrial impact events” by Schmieder et al. (Geochimica et Cosmochimica Acta 220 (2018) 146–157)
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A high-precision 40Ar/39Ar age for the Nördlinger Ries impact crater, Germany, and implications for the accurate dating of terrestrial impact events
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Cited by (16)
SEM pollen analysis of Miocene deposits of Entrischenbrunn (Bavaria, Germany) reveal considerable amounts of pollen of subhumid and sclerophyllous together with azonal water plants reflecting the vegetation mosaic of a braided river system
2023, Review of Palaeobotany and PalynologyCitation Excerpt :The sediment succession is situated within the Upper Freshwater Molasse (OSM) between two marker horizons: the so called Brock-Horizon (Ries crater material) below, at the base of the sand pit, and 14.6 Myr old bentonites above, which were dated by Rocholl et al. (2018b) and crop out in the nearby pit of Unterwohlbach. For the Brock Horizon currently differing magneto-stratigraphic results indicate ranges ages of 14,8 and14.9 million years, respectively (Rocholl et al., 2018a, 2018b; Schmieder et al., 2018a, 2018b). However, based on small mammal stratigraphy, a cyclical subdivision of the Middle Miocene Upper Freshwater Molasse prepared by Fiest (1986; 1994) and later published by Heissig (2006), allows to narrow down the age of the Entrischenbrunn deposits to an interval between 14.9 to 14.7 million years (Fiest, pers.
High precision multi-collector <sup>40</sup>Ar/<sup>39</sup>Ar dating of moldavites (Central European tektites) reconciles geochrological and paleomagnetic data
2022, Chemical GeologyCitation Excerpt :The age of moldavites relative to the FCs reference mineral obtained here of 14.735 ± 0.013 Ma, using the most recent astronomically calibrated age (Phillips et al., 2022), would be 127 ± 15 ka older than the magnetic reverse-normal switch. However, it is important to note that the Ries crater was affected by a post-impact hydrothermal activity of uncertain duration, as much as ~250 ka according to Arp et al. (2013), and which could have delayed the establishment of the necessary conditions for the sedimentation of lacustrine deposits (see also discussion in Schmieder et al., 2018b). All data generated and analysed during this study are included in this article as Supplementary data (Tables A1 and A2).
<sup>40</sup>Ar/<sup>39</sup>Ar systematics of melt lithologies and target rocks from the Gow Lake impact structure, Canada
2020, Geochimica et Cosmochimica ActaCitation Excerpt :Taking the weighted mean of the step-heating and in situ isochron ages (analytical precision only, and subsequently propagating the systematic uncertainty from the decay constant) the best age for the Gow Lake impact event is 196.8 ± 9.6/9.9 Ma (2σ, 5%, analytical/external precision), which overlaps the Triassic-Jurassic boundary (201.36 ± 0.43 Ma, 2σ, zircon 206Pb/238U, external uncertainties; Schoene et al., 2010, as recalculated by Wotzlaw et al., 2014). Our in situ 40Ar/39Ar results support the conclusions of other authors (e.g., Jourdan et al., 2009; Mark et al., 2014; Schmieder et al., 2018a; Schmieder et al., 2018b) that impact-generated glass is the best material for 40Ar/39Ar geochronology of small to medium size impact structures. The 40Ar/39Ar data show that even when derived from a granitic target rock, which typically yields relatively viscous melts, impact-generated melt glass can provide geologically meaningful 40Ar/39Ar ages.
Enigmatic earthquake-generated large-scale clastic dyke in the Biberach area (SW Germany)
2020, Sedimentary GeologyCitation Excerpt :The latter is also known for the most distal occurrence of Ries impact ejecta (the so called ‘Ries-Brockhorizont’; e.g., Buchner et al., 2007; Sach, 2014). Scholz and Frieling (2006), Scholz et al. (2011), and Keller (2012) linked the formation of the clastic dykes to Alpine seismic activity, whereas Letsch (2017) suggested the 14.808 ± 0.038 Ma Nördlinger Ries impact event (Schmieder et al., 2018a, 2018b) produced those dykes. In summer 2019, a clastic dyke of at least 15.2 m in vertical extent (Figs. 2–5) was discovered by one of the authors (V.J.S.) within a sedimentary sequence of the Upper Freshwater Molasse in an area locally known as the “Hochgeländ” (see Probst, 1873, for the first detailed geological description of the area), about 6 km south of the city of Biberach an der Riß in Southern Germany (Fig. 1).
Twinned calcite as an indicator of high differential stresses and low shock pressure conditions during impact cratering
2023, Meteoritics and Planetary Science