Geology and Petrography of the Zapadnaya Impact Crater in the Ukrainian Shield

  • E. P. Gurov
  • E. P. Gurova
  • T. M. Sokur
Part of the Impact Studies book series (IMPACTSTUD)

Abstract

The Zapadnaya impact structure formed within the Precambrian crystalline basement of the Ukrainian Shield 165 ± 6 (K/Ar) Ma ago. The structure is covered by Cenozoic sediments of up to 40 m thickness, but is delineated by over 100 holes drilled since the 1970s. It is an elongated (3.2 × 2.3 km) complex structure. An uplifted horst-like block of cataclased basement rocks separates the crater in two unequal depressions and complicates its structure. The south-eastern depression is larger and includes the central uplift, whereas the north-western depression represents a marginal part of the structure. Allochthonous breccias and suevites fill the crater and overlie the central uplift, but are absent on top of the horst. Impact-melt rocks form dykes or dyke-like bodies in the autochthonous breccias and brecciated crystalline rocks of the crater basement. Prominent shock metamorphic effects in quartz, feldspars, and some other minerals characterize impactites, including autochthonous breccias. High-pressure phases in impact rocks consist of coesite and impact diamond; the latter occur in glass-rich suevites and impact-melt rocks.

Keywords

Quartz Graphite Sulphide Carbide Depression 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • E. P. Gurov
    • 1
  • E. P. Gurova
    • 1
  • T. M. Sokur
    • 1
  1. 1.Institute of Geological SciencesNational Academy of Sciences of UkraineKievUkraine

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