Suavjarvi - Hypervelocity Impact Crater

Alternate Names
Local Language
Coordinates 63° 7' 27" N; 33° 22' 33" E
Notes
  1. 50 km NW of Medvejegorsk in Karelia Republic, Russia.
Country Russia
Region Karelia
Date Confirmed 2012
Notes
  1. Poor data on shock features prior to 2012 made impact origin questioned based on ciruclar feature described first by (Mashchak and Orlova, 1986). Confirmed in 2012 based on report of planar microstructures in quartz (Mashchak and Naumov, 2012).
Buried? No
Drilled? No
Target Type Crystalline
Notes
  1. Granitized gneisses and schists of Archean intruded by plagiogranites and microcline granites of Early Proterozoic. Also metavolcanics and phyllites (Mashshak and Naumov, 1996).
Sub-Type Gneiss, Metavolcanics, Phyllite, Schist, Granite
Apparent Crater Diameter (km) 16 km
Age (Ma) 2200 - 2700
Notes :
  1. A maximum age limit of 2.7 Ga is determined by Late Lopian granitoids that occur as fragments within megabreccias. The lower age limit is approximately 2200-2300 Ma from the occurrence of weathered breccia within the Jatulian basal conglomerates (Mashchak and Naumov, 2012). Additional age constraints: Age of target rocks (Mashchak and Naumov, 1996).

Method :
  1. Stratigraphy
Impactor Type Unknown

Advanced Data Fields

Notes

Erosion
6
  1. Very minor occurrences of crater-fill breccia.
Final Rim Diameter
Unknown
Apparent Rim Diameter
16 km
  1. Diameter of 16 km feature is evident in Lansat photographs (Mashchak and Naumov, 2012).
Rim Reliability Index
1
Crater Morphology
Complex
Central Uplift Diameter
km
Central Uplift Height
Unknown
Uplift Reliability Index
Structural Uplift
Unknown
Thickness of Seds
Target Age
Precambrian
Marine
No
Impactor Type
Other Shock Metamorphism
No
Shatter Cones
No
  1. Not mentionned in (Mashchak and Naumov, 1996).
Planar Fractures
No
Planar Deformation Features
Yes
  1. PDF in quartz grains and microcline with measurements (Mashchak and Naumov, 1996).
Diaplectic Glass
No
Coesite
No
Stisovite
No
Crater Fill
LB
  1. Remnants of monomict and polymict breccias (crystalline rock clasts) are observed (Mashchak and Naumov, 2012). Glass-like fragments have been identified. MB?
Proximal Ejecta
Distal Ejecta
Dykes
Volume of Melt
Depth of Melting

References

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M S Mashchak, M V Naumov (1996) The Suavjarvi structure; an early Proterozoic impact site on the Fennoscandian shield, Abstracts of Papers Submitted to the Lunar and Planetary Science Conference 27, Part 2, p. 825-826, Lunar and Planetary Science Conference, Houston, TX, url

M V Naumov (2002) Impact‐generated hydrothermal systems: Data from Popigai, Kara, and Puchezh‐Katunki impact structures, Impact Structures in Precambrian Shields, J Plado, L J Pesonen (ed.), p. 117-171, Berlin: Impact Studies 2, Springer Verlag, url

M V Naumov (2010) Impact-generated sulfide ore from the Suavjarvi impact structure, Russian Karelia, Abstracts of Papers Submitted to the Lunar and Planetary Science Conference 41, p. 1117, Lunar and Planetary Science Conference, Houston, TX, pdf

M S Mashchak, M V Naumov (2012) The Suavjarvi impact structure, NW Russia, Meteoritics & Planetary Science 47(10), p. 1644-1658, Meteoritical Society, Fayetteville, AR, url, doi:http://dx.doi.org/10.1111/j.1945-5100.2012.01428.x

Mikhail S. Mashchak, Mikhail V. Naumov (2012) The Suavjärvi impact structure, NW Russia, Meteoritics and Planetary Science 47(10), doi:10.1111/j.1945-5100.2012.01428.x

M S Huber, J Plado, L Ferrière (2013) Oldest impact structures on Earth - The case study of the Suavjärvi structure (Russia), LPI Contributions 1737, p. 3073, url

G Komatsu, A Coletta, M L Battagliere, M Virelli (2019) Suavjärvi, Russia, Encyclopedic Atlas of Terrestrial Impact Craters, p. 205-206, Springer, Cham, url, doi:https://doi.org/10.1007/978-3-030-05451-9_52

Goro Komatsu, Alessandro Coletta, Maria Libera Battagliere, Maria Virelli (2019) Suavjärvi, Russia, Encyclopedic Atlas of Terrestrial Impact Craters, doi:10.1007/978-3-030-05451-9_52