40Ar/39Ar laser probe age determination confirms the Ries impact crater as the source of glass particles in Graupensand sediments (Grimmelfingen Formation, North Alpine Foreland Basin)

Buchner, E.; Seyfried, Hartmut; Bogaard, Paul van den

doi:10.1007/s00531-002-0299-2

Cited by 45 publications

(23 citation statements)

References 17 publications

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“…The approximately 24 km diameter Ries impact structure is one of the best preserved terrestrial complex impact structures (Pohl et al 1977). This unique geologic site in Bavaria, southern Germany, formed between 14.3 and 14.5 Ma (Schwarz & Lippolt 2002;Buchner et al 2003;Laurenzi et al 2003) in an approximately 470-820 m thick flatlying sequence of predominantly Mesozoic sedimentary rocks that unconformably overlay Hercynian crystalline basement ( Fig. 1; (Pohl et al 1977;Schmidt-Kaler 1978b).…”

Section: Geologic Setting Of the Ries Impact Structurementioning

confidence: 98%

Hydrothermal activity associated with the Ries impact event, Germany

Osinski¹

2005

Geofluids

133

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Combined field studies, optical and scanning electron microscopy, and electron microprobe studies of impactites from the Ries impact structure, Germany, have allowed a clearer picture of the hydrothermal system associated with the Ries impact event to be made. Hydrothermal alteration is concentrated within impact-generated suevites in the interior of the crater (crater suevites) and around the periphery (surficial suevites), with minor alteration in the overlying sedimentary crater-fill deposits. The major heat source for the Ries hydrothermal system was the suevite units themselves. Hydrothermal alteration of crater-fill suevites is pervasive in nature and comprises several distinct alteration phases that vary with depth. An early phase of K-metasomatism accompanied by minor albitization of crystalline basement clasts and minor chloritization, was followed by pervasive intermediate argillic alteration (predominantly montmorillonite, saponite, and illite) and zeolitization (predominantly analcite, erionite, and clinoptilolite). Hydrothermal fluids were typically weakly alkaline during the main stage of alteration. In contrast to the crater-fill suevites, alteration within surficial suevites was typically restricted to montmorillonite and phillipsite deposition within cavities and fractures. The pervasive nature of the alteration within the crater-fill suevites was likely due to the presence of an overlying crater lake; whereas alteration within surficial suevites typically occurred under undersaturated conditions with the main source of water being from precipitation. There are exceptional outcrops of more pervasively altered surficial suevites, which can be explained as locations where water pooled for longer periods of time. Hydrothermal fluids were likely a combination of meteoric waters that percolated down from the overlying crater lake and groundwaters that flowed in from the surrounding country rocks.

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Section: Geologic Setting Of the Ries Impact Structurementioning

confidence: 98%

Hydrothermal activity associated with the Ries impact event, Germany

Osinski¹

2005

Geofluids

133

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“…Most of the tektites (moldavites from Bohemia, Moravia, and Lusatia) are well dated by several 40 Ar‐ 39 Ar step‐heating analysis (see Schwarz and Lippolt ; Buchner et al. , ; Laurenzi et al. ; Di Vincenzo and Skála ).…”

Section: Introductionmentioning

confidence: 99%

“…() and Ar‐Ar total fusion analysis by Buchner et al. () and Abdul Aziz et al. (); both types of Ries impact melts were additionally measured via K‐Ar and fission track analysis (compilation see e.g., Storzer et al.…”

Section: Introductionmentioning

confidence: 99%

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⁴⁰Ar‐³⁹Ar step‐heating of impact glasses from the Nördlinger Ries impact crater—Implications on excess argon in impact melts and tektites

Schwarz

Lippolt

2014

Meteorit & Planetary Scien

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Abstract-Seven impact melts from various places in the N€ ordlinger Ries were dated by 40 Ar-39 Ar step-heating. The aim of these measurements was to increase the age data base for Ries impact glasses directly from the Ries crater, because there is only one Ar-Ar stepheating spectrum available in the literature. Almost all samples display saddle-shaped age spectra, indicating the presence of excess argon in most Ries glass samples, most probably inherited argon from incompletely degassed melt and possibly also excess argon incorporated during cooling from adjacent phases. In contrast, moldavites usually contain no inherited argon, probably due to their different formation process implying solidification during ballistic transport. The plateau age of the only flat spectrum is 14.60 AE 0. , calculated using the most recent suggestions for the K decay constants) can be considered as reliable and is within uncertainties indistinguishable from the most recent compilation for the age of the moldavite tektites.

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“…After long discussions about the volcanic nature of this basin, comparisons with the nearby Naerdlingen Ries revealed that the basin was formed by a meteorite impact ca. 14.3 Ma years ago (Reiff 1988;Buchner et al 2003;www.steinheimer-becken.de), whereby the central elevation represents a rebound structure formed as a response to the impact. The basin was filled with lake sediments that can be correlated with Mammal Neogene Zone MN 7, which is Late Badenian, or Middle Miocene, respectively (summaries in Gorthner 1992;Heizmann & Reiff 2002;Tçtken et al 2006).…”

Section: The Steinheim Basinmentioning

confidence: 99%

Darwin's dilemma: The Steinheim snails' point of view

Rasser

2013

Zool. Reihe

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Among others, “Darwin's dilemma” is referred to as Charles Darwin's perception that his theory on the origin of species suffers from a scarcity of fossil evidence such as transitional forms between taxa. In 1867, only a few years after the publication of Darwin's “Origin of Species”, Franz Hilgendorf published a phylogenetic tree of Miocene planorbid snails from the Steinheim meteorite crater lake in SW Germany. This tree was widely ignored by Darwin, although it would have been a perfect solution for his “dilemma”. Surprisingly, the reason for his ignorance was the influence of contemporary German and US palaeontologists, who had been followers of the “anti‐Darwinian” orthogenesis concept, which implies the consistency of species and the refusal of the idea that one species may branch into two new species. During the last decades, several studies have supported the appropriateness of Hilgendorf's concept, whom S. J. Gould called one of the first “Darwinians”. With good reason his tree of planorbid snails is seen today as the first phylogenetic tree of fossils and one of the first fossil evidences for Darwin's descendent‐theory. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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40Ar/39Ar laser probe age determination confirms the Ries impact crater as the source of glass particles in Graupensand sediments (Grimmelfingen Formation, North Alpine Foreland Basin)

Cited by 45 publications

References 17 publications

Hydrothermal activity associated with the Ries impact event, Germany

Hydrothermal activity associated with the Ries impact event, Germany

⁴⁰Ar‐³⁹Ar step‐heating of impact glasses from the Nördlinger Ries impact crater—Implications on excess argon in impact melts and tektites

Darwin's dilemma: The Steinheim snails' point of view

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40Ar/39Ar laser probe age determination confirms the Ries impact crater as the source of glass particles in Graupensand sediments (Grimmelfingen Formation, North Alpine Foreland Basin)

Cited by 45 publications

References 17 publications

Hydrothermal activity associated with the Ries impact event, Germany

Hydrothermal activity associated with the Ries impact event, Germany

40Ar‐39Ar step‐heating of impact glasses from the Nördlinger Ries impact crater—Implications on excess argon in impact melts and tektites

Darwin's dilemma: The Steinheim snails' point of view

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⁴⁰Ar‐³⁹Ar step‐heating of impact glasses from the Nördlinger Ries impact crater—Implications on excess argon in impact melts and tektites