Logoisk crater
| Logoisk crater | |
|---|---|
  Logoisk crater Location of the crater in Belarus | |
| Impact crater/structure | |
| Confidence | Confirmed |
| Diameter | 15 kilometres (9 mi) |
| Age | Middle Eocene 42.3 ± 1.1 Ma |
| Exposed | No |
| Drilled | Yes |
| Location | |
| Coordinates | 54°12′N 27°48′E / 54.200°N 27.800°E |
| Country | Belarus |
| Municipality | Lahojsk |
Logoisk crater[a] or Logoisk astrobleme is a meteorite impact crater in Belarus near the city of Lahoysk.
It is 15 kilometers (9.3 mi) in diameter and is estimated to be 42.3 ± 1.1 million years old (Eocene). The crater is not exposed at the surface.[1]
The crater was discovered by an accident during a routine exploration drilling near the village of Kuzevichi in 1970s. A section was discovered with atypical materials in an unusual sequence: Quaternary deposits up to depth of 160m followed by a 230 meter thick layer of layered clays and lacustrine sediments followed by 240 meters of breccias, rocks previously unseen in the geology of Belarus. Three more drills made in 1976-1977 provided a clear evidence of the meteorite origen of the anomaly. Subsequent drillings mapped the crater.[2] During the period of intensive research it was suggested that the crater may contain diamonds formed due high temperature and pressure of the impact, but there has been no confirmation.[3]
Notes
[edit]- ^ also Logoysk crater, Logoysk astrobleme, Logoisk impact structure, etc.
References
[edit]Further reading
[edit]- Sherlock, S. C., Kelley, S. P. , Glazovkaya, L., A New Age for the Logoisk Impact Structure, Berlarus and Implications for the Late Eocene Comet Shower, First International Conference on Impact Cratering in the Solar System. 2006
- Glazovskaya, L. I., Impact transformation of the crystalline basement in the Logoisk astrobleme, Meteorite Impacts in Precambrian Shields. Programme and Abstracts, the 4th Workshop of the European Science Foundation IMpact Programme, Lappajarvi-Karikkoselka-Saaksjarvi, Finland, May 24–28, 2000. ed. J. Plado and L.J. Pesonen. 2000
- Masaitis V. L. et al., The Logoysk Astrobleme, 1984
- Глазовская Л.И., Громов Е.И., Парфенова О.В., Илькевич Г.И. Логойская астроблема. — М.: Наука, 1991. — 141 с., с ил.
