Zeleny Gai - Hypervelocity Impact Crater

Alternate Names Zelenv Gai
Coordinates 48° 4' 5" N; 32° 45' 9" E
Notes
  1. In the Kirovograd district near the town of Zeleny Gay, in the central part of the Ukrainian Shield.
Country Ukraine
Region Kirovograd
Date Confirmed 1976
Notes
  1. Confirmed based on presence of PDF's in quartz grains, and a negative residual gravity anomaly (Val'ter et al., 1976).
Buried? Yes
Notes
  1. Covered by 58 m of Cenozoic sediments (Val'ter et al., 1976).
Drilled? Yes
Notes
  1. Drilling by Val'ter et al. (1976) penetrates Cenozoic covering deposits, sandy argillaceous filling complex and into allogenic and authigenic migmatite and gneiss breccia.
Target Type Crystalline
Notes
  1. Migmatites and gneisses of the Middle Proterozoic (Masaitis et al., 1980).
Sub-Type Gneiss, Migmatite
Apparent Crater Diameter (km) 3.5 km
Age (Ma) 60 - 100
Notes :
  1. Stratigraphy suggests an age of 60-100 Ma (Masaitis 1999). Additional age constraints: Estimated as 120 ± 20 Ma based on the substantial degree of erosion, the age is older than that of the Boltysh impact structure (65.39 ± 0.14 Ma, (Pickersgill et al., 2021) (Masaitis et al., 1980).

Method :
  1. Stratigraphy
Impactor Type Unknown

Advanced Data Fields

Notes

Local Language
Zelenyi Gayi (Kvasnytsya, 2018).
Erosion
4
  1. The crater-fill has been partially preserved (Gurov and Gurova, 1987).
Final Rim Diameter
Unknown
Apparent Rim Diameter
3.5 km
  1. Diameter is 3.5 km (Masaitis, 1999). (Val'ter et al., 1976) (Masaitis et al., 1980)
Rim Reliability Index
1
  1. Consists of a breccia and sediment filled depression covered by Cenozoic sediments (Val'ter et al., 1976).
Crater Morphology
Simple
Central Uplift Diameter
Unknown
Central Uplift Height
Unknown
Uplift Reliability Index
Unknown
Structural Uplift
Unknown
Thickness of Seds
Unknown
Target Age
Precambrian
Marine
No
Impactor Type
Unknown
Other Shock Metamorphism
No
Shatter Cones
Yes
  1. Shatter cones occur in cataclased granites of the bedrock (Masaitis, 1999).
Planar Fractures
No
  1. Did not find in literature.
Planar Deformation Features
Yes
  1. PDF in quartz grains (Val'ter et al., 1976) (Masaitis et al., 1980) and feldspars (Masaitis et al., 1980).
Diaplectic Glass
No
  1. Did not find in literature.
Coesite
No
Stisovite
No
  1. Did not find in literature.
Crater Fill
LB, MB
  1. 120 m of crater-fill polymict lithic breccias and melt-bearing breccias (suevites) are reported. Glass clasts are vesicular (Masaitis, 1999). Potash feldspar grains from glass-poor suevites (Valter, 2011).
Proximal Ejecta
Unknown
Distal Ejecta
Unknown
Dykes
Unknown
Volume of Melt
Unknown
Depth of Melting
Unknown

References

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V L Masaitis (1977) Extraterrestrial impact structures in the USSR, Meteoritics 12, p. 305, url

A I Dabizha, V I Fel'dman (1982) The geophysical characteristic of some astroblemes of the USSR (in Russian), Meteoritika 40, p. 91-101

E P Gurov, E P Gurova (1987) Impact structures on the Earth's surface (in Russian), Geologicheskii Zhurnal 47, p. 117-124

A Valter (2011) Shock-induced twinning of K-spars crystals; the remarkable feature of glass-poor suevites of Zeleny Gay Astrobleme, Ukraine, Abstracts of Papers Submitted to the Lunar and Planetary Science Conference 42, p. 1158, Lunar and Planetary Science Conference, Houston, TX, url

E Flamini, A Coletta, M L Battagliere, M Virelli (2019) Zeleny Gai, Ukraine, Encyclopedic Atlas of Terrestrial Impact Craters, p. 445-446, Springer, Cham, url, doi:https://doi.org/10.1007/978-3-030-05451-9_121