The Lower Palaeozoic of the probable impact crater of Hummeln, Sweden

Lindström, Maurits; Flodén, Tom; Grahn, Yngve; Hagenfeldt, Stefan E.; Ormö, Jens; Sturkell, Erik; Törnberg, Roger

doi:10.1080/11035899901213243

Cited by 15 publications

(10 citation statements)

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“…This lack of evidence is not unusual in craters of this size. From research drilling, it was demonstrated that the structure formed in the Ordovician epicontinental sea (Lindström et al 1999). The structure is eroded, and only the sedimentary infill and its chronological position in palaeoenvironmental reconstructions (e.g.…”

Section: Presentation and Discussion Of Known Marine-target Cratersmentioning

confidence: 97%

“…com. 1999), Mjolnir (Dypvik et al 1996; melt sheet, resurge deposit and rim wall: Tsikalas, Gudlaugsson & Faleide, 1998), Montagnais (Jansa, 1993), Chesapeake Bay (Poag, 1997), Hummeln (Lindström et al, 1999), Granby (Bruun & Dahlman, 1982;age: Grahn, Nõlvak & Paris, 1996. Water depth: Lindström et al 1996a and this paper), Kärdla (Puura & Suuroja, 1992;age: Grahn, Nõlvak & Paris, 1996;water depth: Puura & Suuroja, 1992), Ames (Carpenter & Carlson, 1992;age: John Repetski (pers.…”

Section: Presentation and Discussion Of Known Marine-target Cratersmentioning

confidence: 97%

“…Granby (3 km wide; late Early Ordovician; Grahn, Nõlvak & Paris, 1996) and Hummeln (1.2 km wide; late Early Ordovician or maybe younger; Lindström et al 1999) apparently occurred during a regressive phase of the Ordovician sea (Männil, 1966;Fortey, 1984). The description of Granby based on drill cores (Bruun & Dahlman, 1982) contains evidence of slumping.…”

Section: Presentation and Discussion Of Known Marine-target Cratersmentioning

confidence: 98%

“…Männil, 1966) give information about the depth of the water at the time of its formation. In addition to drilling, the structure has been investigated with seismic surveys (Lindström et al 1999) and by resistivity, magnetometry and gravimetry . All these investigations point towards an impact origin for Hummeln.…”

Section: Presentation and Discussion Of Known Marine-target Cratersmentioning

confidence: 99%

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When a cosmic impact strikes the sea bed

2000

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Most bolides that collide with the Earth hit the sea. Limited knowledge about marine-target impacts hampers predictions about their perilousness. This study presents geological features that are particular to craters formed at sea. The features are most likely a result of the influence of the target on the cratering process. Marine-target craters form only if the target sea is shallow enough to admit sufficient kinetic energy into the sea bed. When the crater diameter is large compared to the water depth, the crater resembles its counterparts that are formed on land. Craters formed in deeper water are concentric, and often lack melt sheets and rim walls, but have deposits and radial gullies formed by the resurge of the sea. Impacts on the deep shelf are probably much more energetic than is suggested by the dimensions of the preserved crater.

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Section: Presentation and Discussion Of Known Marine-target Cratersmentioning

confidence: 97%

Section: Presentation and Discussion Of Known Marine-target Cratersmentioning

confidence: 97%

Section: Presentation and Discussion Of Known Marine-target Cratersmentioning

confidence: 98%

Section: Presentation and Discussion Of Known Marine-target Cratersmentioning

confidence: 99%

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When a cosmic impact strikes the sea bed

2000

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“…Immigration of the surrounding fauna occurred almost immediately on the postimpact ocean floor (Lindström et al 1994;Grahn et al 1996). The geological history of the marine-target Baltoscandian craters is described in earlier works (e.g., Tvären crater [Lindström et al 1994;Ormö 1994]; Lockne crater [Lindström et al 1996;Sturkell 1998;Dalwigk and Ormö 2001;Lindström et al 2005a; Kärdla crater: Puura and Suuroja 1992;Puura et al 2004]; Granby crater [Bruun and Dahlman, 1982]; the probable Hummeln crater [Lindström et al 1999;Ormö et al 1999]). …”

Section: Introductionmentioning

confidence: 99%

Facies distribution of post‐impact sediments in the Ordovician Lockne and Tvären impact craters: Indications for unique impact‐generated environments

Frisk

Ormö

2007

Meteorit & Planetary Scien

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available online at http://meteoritics.org Abstract-The Lockne and Tvären craters formed in the Late Ordovician Baltoscandian epicontinental sea. Both craters demonstrate similarities concerning near-synchronous age, target seabed, and succeeding resurge deposits; however, the water depths at the impact sites and the sizes of the craters were not alike. The post-impact sedimentary succession of carbonates, i.e., the Dalby Limestone, deposited on top of the resurge sediments in the two craters, is nevertheless similar. At least three main facies of the Dalby Limestone were established in the Lockne crater, depending on sea-floor topography, location with respect to the crater, and local water currents. The dominating nodular argillaceous facies, showing low values of inorganic carbon (IC), was distributed foremost in the deeper and quiet areas of the crater floor and depressions. At the crater rim, consisting of crushed crystalline basement ejecta, a rim facies with a reef-like fauna was established, most certainly due to topographical highs and substrate-derived nutrients. Between these facies are occurrences of a relatively thick-bedded calcilutite rich in cephalopods (cephalopod facies). Facies distribution of post-impact sediments in the Ordovician Lockne and Tvären impact craters: Indications for unique impact-generated environmentsIn Tvären, the lower part of the succession consists of an analogous argillaceous facies, also showing similar low IC values as in Lockne, followed by calcareous mudstones with an increase of IC. Occasionally biocalcarenites with a distinctive fauna occur in the Tvären succession, probably originating as detritus from a facies developed on the rim. They are evident as peaks in IC and lows in organic carbon (Corg). The fauna in these biocalcarenites corresponds very well with those of erratic boulders derived from Tvären; moreover, they correspond to the rim facies of Lockne except for the inclusion of photosynthesizing algae, indicating shallower water at Tvären than Lockne. Consequently, we suggest equivalent distribution patterns for the carbonates of the Dalby Limestone in Lockne and Tvären.

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Settings of Meteorite Impact Structures in the Svecofennian Crustal Domain

Puura

Plado

Impact Studies

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The Lower Palaeozoic of the probable impact crater of Hummeln, Sweden

Cited by 15 publications

References 15 publications

When a cosmic impact strikes the sea bed

When a cosmic impact strikes the sea bed

Facies distribution of post‐impact sediments in the Ordovician Lockne and Tvären impact craters: Indications for unique impact‐generated environments

Settings of Meteorite Impact Structures in the Svecofennian Crustal Domain

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