2023
DOI: 10.1029/2023je007777
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The Proximal Ejecta Around the Marine‐Target Lockne Impact Structure, Sweden

Erik Sturkell,
Jens Ormö,
Eric Austin Hegardt
et al.

Abstract: Except for some impact structures on low-gravity cosmic bodies, essentially all fresh impact structures are surrounded by ejecta from the crater interior (Melosh, 1989, p. 89). The geological activity on Earth does not favor the preservation of ejecta deposits. The preservation varies considerably. The best-preserved exposed ejecta deposits according to Osinski et al. (2011) are the Mauritanian Tenoumer structure (1.9 km diameter, 0.0214 Ma) and Pingualuit (New Quebec) in Canada (3.4 km diameter, 1.4 Ma). In T… Show more

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Cited by 1 publication
(4 citation statements)
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“…The outer crater in the sedimentary strata formed by a shallow excavation flow, as illustrated in the numerical simulations by Lindström, Shuvalov, and Ivanov (2005) and Shuvalov et al. (2005), and was only slightly affected by erosion from the subsequent collapse of the water cavity (e.g., Sturkell et al., 2023). There was no crater modification collapse of the surrounding sedimentary strata other than some slumping of the Cambrian mud (Sturkell et al., 2013).…”
Section: Methodsmentioning
confidence: 95%
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“…The outer crater in the sedimentary strata formed by a shallow excavation flow, as illustrated in the numerical simulations by Lindström, Shuvalov, and Ivanov (2005) and Shuvalov et al. (2005), and was only slightly affected by erosion from the subsequent collapse of the water cavity (e.g., Sturkell et al., 2023). There was no crater modification collapse of the surrounding sedimentary strata other than some slumping of the Cambrian mud (Sturkell et al., 2013).…”
Section: Methodsmentioning
confidence: 95%
“…There was also at least 500 m of seawater, possibly as much as 700 m, at the target site, which formed a water cavity of similar diameter as the preserved outer crater (e.g., Lindström, Shuvalov, & Ivanov, 2005;Shuvalov et al, 2005). The outer crater in the sedimentary strata formed by a shallow excavation flow, as illustrated in the numerical simulations by Lindström, Shuvalov, and Ivanov (2005) and Shuvalov et al (2005), and was only slightly affected by erosion from the subsequent collapse of the water cavity (e.g., Sturkell et al, 2023). There was no crater modification collapse of the surrounding sedimentary strata other than some slumping of the Cambrian mud (Sturkell et al, 2013).…”
Section: Terrestrial and Martian Examplesmentioning
confidence: 92%
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