Shocked quartz in distal ejecta from the Ries impact event (Germany) found at ~ 180 km distance, near Bernhardzell, eastern Switzerland

Abstract Impact ejecta formation and emplacement is of great importance when it comes to understanding the process of impact cratering and consequences of impact events in general. Here we present a multidisciplinary investigation of a distal impact ejecta layer, the Blockhorizont, that occurs near...

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Autores principales:	Sanna Holm-Alwmark, Carl Alwmark, Ludovic Ferrière, Matthias M. M. Meier, Sofie Lindström, Gavin G. Kenny, Emma Sheldon, Günter Schweigert, Christoph Spötl, Martin J. Whitehouse, Beda A. Hofmann
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/35363feea7fa44acb335e0ad61b52b55
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spelling	oai:doaj.org-article:35363feea7fa44acb335e0ad61b52b552021-12-02T14:25:21ZShocked quartz in distal ejecta from the Ries impact event (Germany) found at ~ 180 km distance, near Bernhardzell, eastern Switzerland10.1038/s41598-021-86685-22045-2322https://doaj.org/article/35363feea7fa44acb335e0ad61b52b552021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86685-2https://doaj.org/toc/2045-2322Abstract Impact ejecta formation and emplacement is of great importance when it comes to understanding the process of impact cratering and consequences of impact events in general. Here we present a multidisciplinary investigation of a distal impact ejecta layer, the Blockhorizont, that occurs near Bernhardzell in eastern Switzerland. We provide unambiguous evidence that this layer is impact-related by confirming the presence of shocked quartz grains exhibiting multiple sets of planar deformation features. Average shock pressures recorded by the quartz grains are ~ 19 GPa for the investigated sample. U–Pb dating of zircon grains from bentonites in close stratigraphic context allows us to constrain the depositional age of the Blockhorizont to ~ 14.8 Ma. This age, in combination with geochemical and paleontological analysis of ejecta particles, is consistent with deposition of this material as distal impact ejecta from the Ries impact structure, located ~ 180 km away, in Germany. Our observations are important for constraining models of impact ejecta emplacement as ballistically and non-ballistically transported fragments, derived from vastly different depths in the pre-impact target, occur together within the ejecta layer. These observations make the Ries ejecta one of the most completely preserved ejecta deposit on Earth for an impact structure of that size.Sanna Holm-AlwmarkCarl AlwmarkLudovic FerrièreMatthias M. M. MeierSofie LindströmGavin G. KennyEmma SheldonGünter SchweigertChristoph SpötlMartin J. WhitehouseBeda A. HofmannNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sanna Holm-Alwmark Carl Alwmark Ludovic Ferrière Matthias M. M. Meier Sofie Lindström Gavin G. Kenny Emma Sheldon Günter Schweigert Christoph Spötl Martin J. Whitehouse Beda A. Hofmann Shocked quartz in distal ejecta from the Ries impact event (Germany) found at ~ 180 km distance, near Bernhardzell, eastern Switzerland
description	Abstract Impact ejecta formation and emplacement is of great importance when it comes to understanding the process of impact cratering and consequences of impact events in general. Here we present a multidisciplinary investigation of a distal impact ejecta layer, the Blockhorizont, that occurs near Bernhardzell in eastern Switzerland. We provide unambiguous evidence that this layer is impact-related by confirming the presence of shocked quartz grains exhibiting multiple sets of planar deformation features. Average shock pressures recorded by the quartz grains are ~ 19 GPa for the investigated sample. U–Pb dating of zircon grains from bentonites in close stratigraphic context allows us to constrain the depositional age of the Blockhorizont to ~ 14.8 Ma. This age, in combination with geochemical and paleontological analysis of ejecta particles, is consistent with deposition of this material as distal impact ejecta from the Ries impact structure, located ~ 180 km away, in Germany. Our observations are important for constraining models of impact ejecta emplacement as ballistically and non-ballistically transported fragments, derived from vastly different depths in the pre-impact target, occur together within the ejecta layer. These observations make the Ries ejecta one of the most completely preserved ejecta deposit on Earth for an impact structure of that size.
format	article
author	Sanna Holm-Alwmark Carl Alwmark Ludovic Ferrière Matthias M. M. Meier Sofie Lindström Gavin G. Kenny Emma Sheldon Günter Schweigert Christoph Spötl Martin J. Whitehouse Beda A. Hofmann
author_facet	Sanna Holm-Alwmark Carl Alwmark Ludovic Ferrière Matthias M. M. Meier Sofie Lindström Gavin G. Kenny Emma Sheldon Günter Schweigert Christoph Spötl Martin J. Whitehouse Beda A. Hofmann
author_sort	Sanna Holm-Alwmark
title	Shocked quartz in distal ejecta from the Ries impact event (Germany) found at ~ 180 km distance, near Bernhardzell, eastern Switzerland
title_short	Shocked quartz in distal ejecta from the Ries impact event (Germany) found at ~ 180 km distance, near Bernhardzell, eastern Switzerland
title_full	Shocked quartz in distal ejecta from the Ries impact event (Germany) found at ~ 180 km distance, near Bernhardzell, eastern Switzerland
title_fullStr	Shocked quartz in distal ejecta from the Ries impact event (Germany) found at ~ 180 km distance, near Bernhardzell, eastern Switzerland
title_full_unstemmed	Shocked quartz in distal ejecta from the Ries impact event (Germany) found at ~ 180 km distance, near Bernhardzell, eastern Switzerland
title_sort	shocked quartz in distal ejecta from the ries impact event (germany) found at ~ 180 km distance, near bernhardzell, eastern switzerland
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/35363feea7fa44acb335e0ad61b52b55
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Shocked quartz in distal ejecta from the Ries impact event (Germany) found at ~ 180 km distance, near Bernhardzell, eastern Switzerland

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