Neugrund - Hypervelocity Impact Crater
Alternate Names | |
Local Language | |
Coordinates |
59° 19' 44" N; 23° 37' 3" E Notes
|
Country | Estonia |
Region | Harju |
Date Confirmed | 1997 Notes
|
Buried? |
Yes Notes
|
Drilled? | No |
Target Type |
Crystalline
Notes
|
Sub-Type | Amphibolite, Gneiss, Granitoid |
Apparent Crater Diameter (km) | 20 km |
Age (Ma) | 530 - 540 Notes :
Method :
|
Impactor Type | Unknown |
Advanced Data Fields
Notes
- Deeply eroded structure.
- Initially a 7 km rim-to-rim diameter was measured which was later interpreted as the inner ring wall. Later a 9 km diameter inner ring was distinguished with an outer crater diameter outlined by the ring fault at 20 km (Suuroja and Suuroja, 2010).
- A central uplift (plateau) appears to be ~5.5 km in diameter (Suuroja and Suuroja, 2010).
- (Suuroja and Suuroja, 2000) report on "conical fracture surfaces (shatter cones)" within breccia samples" (in rim-wall ejected blocks and/or erratic boulders?). [To be confirmed!]
- PDF in breccias (Suuroja, pers. comm.). PDF in quartz are rarely observed (Suuroja and Suuroja, 2000).
- Lithic impact breccias, melt-bearing breccias and melt rocks have been documented (Suuroja and Suuroja, 2010).
References
(2000) Neugrund structure: The newly discovered submarine Early Cambrian impact crater, Impacts and the Early Earth 91, Iain Gilmour, Christian Koeberl (ed.), p. 389-416, Springer-Verlag, Berlin-Heidelberg-New York, url, doi:10.1007/BFb0027753
(2000) Impact events in Estonia and their possible environmental consequences, Catastrophic Events and Mass Extinctions: Impacts and Beyond 1053, p. 177-178, Lunar and Planetary Institute, Houston, TX, url
(2003) The Osmussaar Breccia in northwestern Estonia — Evidence of a ~ 475 Ma earthquake or an impact?, Impact Markers in the Stratigraphic Record, C Koeberl, F C Martinez-Ruiz (ed.), p. 333-347, Berlin: Springer-Verlag, Heidelberg, url, doi:10.1007/978-3-642-55463-6_14
(2004) The Neugrund meteorite crater on the seafloor of the Gulf of Finland, Estonia, Cratering in marine environments and on ice, H Dypvik, M Burchell, P Claeys (ed.), p. 75-95, Berlin: Springer-Verlag, Berlin, url, doi:10.1007/978-3-662-06423-8_5
(2004) Impacts into marine and icy environments; a short review, Cratering in Marine Environments and on Ice, Henning Dypvik, Mark Burchell, Philippe Claeys (ed.), p. 1-20, Springer-Verlag, Berlin, url, doi:10.1007/978-3-662-06423-8_1
(2004) Does the marine-target crater record reflect an increased cosmic bombardment during the Middle Ordovician?, Abstracts with Programs - Geological Society of America 36(5), p. 321-321L, Geological Society of America (GSA), Boulder, CO, url
(2007) Seafloor geological survey in Estonian shelf area, Baltica 20(1-2), p. 53-58, Geologijos ir Geografijos Institutas, Vilnius, url
(2008) Geology and lithology of the early Palaeozoic marine impact structures Kardla and Neugrund (Estonia), Dissertationes Geologicae Universitatis Tartuensis 23, p. 1-234, Tartu: Tartu University Press, Tartu, url
(2010) The Neugrund meteorite crater on the seafloor of the Gulf of Finland, Estonia, Baltica 23(1), p. 47-58, Geologijos ir Geografijos Institutas, Vilnius, url
(2010) The Mid-Ordovician Osmussaar breccia in Estonia linked to the disruption of the L-chondrite parent body in the asteroid belt, Geological Society of America Bulletin 122(7-8), p. 1039-1046, Geological Society of America (GSA), Boulder, CO, url, doi:http://dx.doi.org/10.1130/B30040.1
(2011) Wave climate and coastal processes in the Osmussaar-Neugrund region, Baltic Sea, WIT Transactions on Ecology and the Environment 149, p. 99-110, WIT Press, Southampton, url, doi:10.2495/CP110091
(2012) Meteorite impact craters and possibly impact-related structures in Estonia, Meteoritics & Planetary Science 47(10), p. 1590-1605, Meteoritical Society, Fayetteville, AR, url, doi:10.1111/j.1945-5100.2012.01422.x
(2012) Features of the marine impact structures of Neugrund and Kärdla (Baltic Sea, Estonia), 75th Annual Meteoritical Society Meeting 47(S1), p. A336-A336, url, doi:10.1111/j.1945-5100.2012.01401_2.x
(2012) Features of the dislocation zone of complex impact structures; marine impact structures Neugrund and Kardla (Baltic Sea, Estonia), Geological Survey of Finland, Guide 57 57, J Virtasalo, H Vallius (ed.), p. 82-83, Helsinki: Juvenes Print, url
(2013) A comparative analysis of two Early Palaeozoic marine impact structures in Estonia, Baltic Sea: Neugrund and Kardla, Bulletin of the Geological Society of Finland 85(1), p. 83-101, url, doi:10.17741/bgsf/85.1.006
(2017) The real diameter of the Neugrund impact structure (Gulf of Finland, Estonia), European Planetary Science Congress 2017 11, Riga: EPSC Abstracts, pdf
(2020) The evolution of the Estonian Precambrian basement: Geological, geophysical, and geochronological constraints, Proceedings of the Karelian Research Centre of the Russian Academy of Sciences(2), p. 18-23, url, doi:10.17076/geo1185
(2021) Impact structures as indicators of cratonic denudation, Lithosphere 2021 - 11th Symposium on Structure, Composition, and Evolution of the Lithosphere, I Kukkonen, T Veikkolainen, S Heinonen, F Karell, E Kozlovskaya, A Luttinen, K Nikkilä, V Nykänen, M Poutanen, P Skyttä, E Tanskanen, T Tiira (ed.), p. 27-30, Helsinki: Institute of Seismology, url