Early post-impact sedimentation around the central high of the Mjølnir impact crater (Barents Sea, Late Jurassic)

Dypvik, Henning; Sandbakken, Pål T.; Postma, George; Mørk, Atle

doi:10.1016/j.sedgeo.2004.03.009

Cited by 20 publications

(8 citation statements)

References 29 publications

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“…Tsunamites have been documented in deep water sedimentary sequences from the Middle (Brookfield et al. 2006) and Late Jurassic (Dypvik et al. 2004) and some coarse‐grained sediments of the ‘Purbeckian’ facies in northern France (Deconnick et al.…”

Section: Discussionmentioning

confidence: 99%

Palaeoenvironment and taphonomy of a Late Jurassic (Late Tithonian) Lagerstätte from central Poland

Kin

Gruszczyński

Martill

et al. 2013

LET

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A rich assemblage of exceptionally preserved marine and terrestrial fossils occurs in fine‐grained limestones in the upper part of the Late Tithonian (Middle Volgian) shallowing upward carbonate sequence in Central Poland. The richest horizon, a deposit known locally as the Corbulomima horizon, is named after the shallow burrowing suspension feeding bivalve Corbulomima obscura, moulds of which occur in densities of up to 500 per square metre on some bedding planes. The fauna in this bed also includes organic and phosphatic remains of a wide range of other creatures including the exuviae of limulids and decapods, disarticulated fish skeletons and rare isolated pterosaur bones and teeth. There are also perfectly preserved dragonfly wings and beetle exoskeletons. The average stable carbon and oxygen isotope values for ostracod shells and fine‐grained sediment from this horizon suggest precipitation of the calcium carbonate from warm seawater of normal marine salinity. The carbonate sediments overlying the fossiliferous horizon have been interpreted as nearshore to shoreface facies. These pass abruptly into coarse reworked intraclastic sediments interpreted as possible tsunami or storm surge over‐wash deposits. The clasts in this deposit have more positive oxygen isotope values than those in the underlying limestone, which may indicate that they were lithified in a slightly more evaporative, perhaps intertidal, setting. The succession terminates with silicified fine‐grained limestones likely to have formed in extremely shallow lagoonal environments. In contrast with the Solnhofen limestones of Lower Tithonian age in south‐central Germany the Corbulomima horizon is interpreted as a transitional deposit formed in a shallow marine setting by rapid burial with elements of both Konservat‐ and Konzentrat‐Lagerstätte preservation. □Konzentrat and Konservat‐Lagerstätte, Taphonomy, Palaeoenvironment, Paleogeography, Late Jurassic, Poland.

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Section: Discussionmentioning

confidence: 99%

Palaeoenvironment and taphonomy of a Late Jurassic (Late Tithonian) Lagerstätte from central Poland

Kin

Gruszczyński

Martill

et al. 2013

LET

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“…The coincidence of the Morokweng and Mjølnir HVI craters with the end-Jurassic boundary is noteworthy. The two craters were not synchronous, as high-resolution stratigraphic evidence shows that the Mjølnir HVI occurred after the end-Jurassic boundary (Smelror et al 2001;Dypvik et al 2004), but the conservative error assigned to the age (Gradstein et al 2005) overlaps with the end of the Jurassic.…”

Section: Hvi Crater Ages and Their Relationship With Stratigraphic Bomentioning

confidence: 99%

“…In other words, the impact is known to be younger than the target rock from which the crater formed, but older than the crater-filling sediments. Sometimes this technique can yield tight age constraints (Smelrør et al 2001;Dypvik et al 2004), but other HVI craters have only a maximum age constraint from the target rock. Crater counting and overlap, which provides strong constraints for crater ages on other bodies such as the Moon and Mars Neukum et al 2001), does not work on the Earth with its constantly reworked surface, and only two craters on Earth can be dated relative to one another.…”

Section: Use Of Radiometric Dating To Determine the Ages Of Hvismentioning

confidence: 99%

The geochronology of large igneous provinces, terrestrial impact craters, and their relationship to mass extinctions on Earth

Kelley

2007

JGS

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The relationship between sudden catastrophic events and sudden mass extinctions on Earth has attracted a great deal of research effort, including measurements of the absolute and relative ages of these events. The result has been a rapid improvement in the precision and accuracy of radiometric dates for large igneous provinces (LIPs), for which there is now a consensus on the peak eruption times over the last 250 Ma. In parallel there has been a more gradual improvement in the radiometric dates for craters formed by hypervelocity impacts (HVIs) of asteroids and comets with Earth. The absolute ages of the largest craters are known to within a few million years but the ages of many smaller craters are poorly constrained. In addition, whereas relatively few LIPs have formed in the last 250 Ma, at least one HVI crater larger than 20 km diameter has formed on Earth every million years (only 25 such craters have been discovered), so coincidence between the ages of HVI crater formation and ages of mass extinctions is related as much to crater preservation as to coincidence of the events. The difference in quality of geochronology between HVIs and LIPs is the result of differing availability of samples: LIPs cover large areas and present an array of basalt samples suitable for dating, whereas HVI craters are often poorly preserved and present few datable samples. The radiometric data for preserved HVIs and LIPs are now sufficiently precise and accurate for us to be confident that there is no one-to-one correlation between either LIPs or HVIs and global mass extinctions of life on Earth. However, there is a close association between a significant number of LIPs and sudden environmental change, and a very close association between at least one massive HVI crater formation and a mass extinction. Further, there is no apparent correlation between HVIs and LIPs and thus no reason to suggest a causative relationship. Finally, the radiometric dating of HVI craters indicates several clusters in the geological record, but the correlation with sudden environmental change is no better than for large craters.

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“…Still, the most commonly reported liquefaction trigger is undoubtedly earthquake shaking (Seilacher, 1969;Pratt, 1994;Alfaro et al, 1997;Pope et al, 1997;Rodríguez-Pascua et al, 2000;Obermeier et al, 2002;McLaughlin and Brett, 2004;Bachmann and Aref, 2005;Mazumder et al, 2006;Montenat et al, 2007;Moretti and Ronchi, 2011, among many others). A few studies have linked liquefaction phenomenon even to meteorite impacts (Sturkell and Ormö, 1997;Alvarez et al, 1998;Simms, 2007) or their subaqueous resurge deposits (Poag et al, 1992;Dypvik et al, 2004;Schulte et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Extensive soft-sediment deformation structures in the early Darriwilian (Middle Ordovician) shallow marine siliciclastic sediments formed on the Baltoscandian carbonate ramp, northwestern Estonia

Põldsaar

Ainsaar

2014

Marine Geology

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Early post-impact sedimentation around the central high of the Mjølnir impact crater (Barents Sea, Late Jurassic)

Cited by 20 publications

References 29 publications

Palaeoenvironment and taphonomy of a Late Jurassic (Late Tithonian) Lagerstätte from central Poland

Palaeoenvironment and taphonomy of a Late Jurassic (Late Tithonian) Lagerstätte from central Poland

The geochronology of large igneous provinces, terrestrial impact craters, and their relationship to mass extinctions on Earth

Extensive soft-sediment deformation structures in the early Darriwilian (Middle Ordovician) shallow marine siliciclastic sediments formed on the Baltoscandian carbonate ramp, northwestern Estonia

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