Rotmistrovka - Hypervelocity Impact Crater

Alternate Names Rotmistovsky
Coordinates 49° 0' 0" N; 32° 0' 0" E
Notes
  1. Near the village of Rotmistrovka in the Cherkasy district, 30 km NNW of the Boltysh crater.
Country Ukraine
Region Cherkasy
Date Confirmed 1976
Notes
  1. PDFs in quartz (Masaitis et al., 1976).
Buried? Yes
Notes
  1. Filled with 120 m of Upper Cretaceous, which is covered by 80 m of Cretaceous and Paleocene clay and Quaternary deposits (Masaitis et al., 1976).
Drilled? Yes
Notes
  1. 3 boreholes within the depression penetrate Quaternary and Cretaceous clays and sands (overlying complex) and into allo- and authigenic granitic breccia (Masaitis et al., 1980).
Target Type Crystalline
Notes
  1. Middle Proterozoic granite (Masaitis et al., 1976).
Sub-Type Volcanics, Granite
Apparent Crater Diameter (km) 2.7 km
Age (Ma) 94 - 145
Notes :
  1. 94-145 Ma based on stratigraphic age constraints (Early Cretaceous or Turonian) (Masaitis, 1999). Previous work estimated an age of Late Jurassic or Early Cretaceous, approximately 140 ± 20 Ma (Masaitis et al., 1976).

Method :
  1. Stratigraphy
Impactor Type Unknown

Advanced Data Fields

Notes

Local Language
Rotmistrivka (Kvasnytsya, 2018).
Erosion
4
  1. Rim Is largely eroded; the crater-fill products have been preserved (Masaitis et al., 1980).
Final Rim Diameter
Unknown
Apparent Rim Diameter
2.7 km
  1. Diameter is 2.7 km (Masaitis, 1999).
Rim Reliability Index
1
  1. Consists of a bowl-shaped depression partially filled with breccia and covered by sediments (Masaitis et al., 1980).
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
Maskelynite
  1. (Masaitis et al., 1980)
Shatter Cones
No
  1. Buried impact structure.
Planar Fractures
No
Planar Deformation Features
Yes
  1. PDF in quartz (Masaitis et al., 1980).
Diaplectic Glass
No
Coesite
No
Stisovite
No
Crater Fill
LB, MB
  1. Crater-fill lithic breccias ("allogenic breccia") and melt-bearing breccias (suevites) as lenses in the LB are observed in drill cores. These crater-fill impactites have a thickness of ~60 m and the amount of melt increases upward (Masaitis, 1999). Pseudotachylite veins are also observed. "The suevite matrix contains small mineral clasts and impact glass particles" (Masaitis, 1999).
Proximal Ejecta
Unknown
Distal Ejecta
Unknown
Dykes
P
Volume of Melt
Unknown
Depth of Melting
Unknown

References

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A A Val'ter, V P Brjansky, E E Lazarenko (1984) The peculiarities of the astroblemes genesis of the Ukrainian Shield, 27th international geological congress; Comparative planetology, V.N.U. Science Press B.V., Utrecht, url