Diamictites and soft sediment deformation related to the Ries (ca. 14.9 Ma) meteorite impact: the “Blockhorizont” of Bernhardzell (Eastern Switzerland)

Letsch, Dominik

doi:10.1007/s00531-017-1542-1

Cited by 7 publications

(22 citation statements)

References 5 publications

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“…The DREL 10,11,22,31,34 was described from several outcrops in the Middle Miocene Upper Freshwater Molasse of the North Alpine Foreland Basin in Bavaria 33,35,52 (SE Germany), Baden-Württemberg 10,11,31 (SW Germany), and NE Switzerland 34 . During eld work, we found additional outcrops of distal Ries ejecta in three ravines south of Biberach an der Riß and west of Ravensburg, recpectively.…”

Section: Distal Ries Ejectamentioning

confidence: 99%

“…4B) caused by the impact of Ries-ejected pebbles, cobbles, and boulders ( Fig. 4C) into the soft sediment after ballistic air-travel over >100 km 10,11,31,34 . Some of the clasts (mainly of Upper Jurassic limestones) contain shatter-cones ( Fig.…”

Section: Distal Ries Ejectamentioning

confidence: 99%

“…The Ries impact caused a series of events that affected the wider surroundings of the crater within a minimum radial distance of 180 km [2][3][4][9][10][11]22,31,33,34,41,42,52,53,61 . Some of the effects overlap and initiated the near-complete destruction of the surface-near environment within this radial distance.…”

Section: Environmental Effects Of the Ries And Steinheim Eventsmentioning

confidence: 99%

“…Impact melt occurs in various forms, including tektites found in the Central European tektite strewn eld 9,15 . A conspicuous marker bed is the coarse-grained distal Ries ejecta layer (henceforth DREL; locally known as the 'Brockhorizont', 'Blockhorizont', and 'Reuter Blocks') 10,11,22,31,34,37 , a locally reworked horizon of sand, pebbles, cobbles, and boulders of predominantly Upper Jurassic limestone. It was ballistically transported over distances up to 180 km, deposited and preserved in the siliciclastic sediments of the North Alpine Foreland Basin.…”

Section: Introductionmentioning

confidence: 99%

“…Various outcrops that include the DREL 10,11,22,31,34 are known from the North Alpine Foreland Basin 51 in southern Germany and northern Switzerland within a maximum distance of 180 km from the Nördlinger Ries 10,11,34 . Most of these ejecta components are Upper Jurassic limestone derived from the upper portion of the Ries target rock, some of them with shatter cones 11,34 con rming their origin as impact ejecta and suggesting shock pressures of at least ~2 GPa 58 .…”

Section: Introductionmentioning

confidence: 99%

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The Ries-Steinheim crater pair and two major earthquakes – New discoveries challenging the double-impact theory

Buchner

Sach²,

Schmieder³

2020

Preprint

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The Nördlinger Ries and the Steinheim Basin are widely perceived as a Middle Miocene impact crater doublet. We discovered two independent earthquake-produced seismite horizons in North Alpine Foreland Basin deposits. The older seismite horizon,associated with the Ries impact is overlain by in situ-preserved distal impact ejecta, forming a unique continental seismite-ejecta couplet within a distance up to 180 km from the crater. The younger seismite unit, also triggered by a major palaeo-earthquake, comprises clastic dikes that cut through the Ries seismite-ejecta couplet. The clastic dikes were likely formed in response to the Steinheim impact, some kyr after the Ries impact, in line with paleontologic results. With the Ries and Steinheim impacts as two separate events, Southern Germany witnessed a double disaster in the Middle Miocene. The magnitude–distance relationship of seismite formation during large earthquakes suggests the seismic and destructive potential of impact-earthquakes may be significantly underestimated.

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