1. .., .. (1979). Σ .. , .: , . 126-148
  2. .., .. (1982). .. , Issue 40, . 82-90
  3. .. (1987). . , Issue 46, . 154-171
  4. .. (1987). .. , .:
  5. .. . (1991). , . ޣ , , , 128 .
  6. - .. (2007). " " . - "", , 272.
  7. (1988). Astronauts guide to terrestrial impact craters.. Space Shuttle Earth Observation Project, Lunar and Planetary Institute (March 1988).
  8. Graham, Bevan and Hutchison (1985). Catalogue of Meteorites. 4th Edition
  9. Grieve R.A.F. (1987). Terrestrial impact structures. Ann.Rev.Earth Planet.Sci., Vol.15, p. 245-270
  10. Hodge, Paul W., (1994). Meteorite craters and impact structures of the Earth. Cambridge University Press , 122 .
  11. Abate B., Koeberl C., Underwood J.R.(Jr), Fisk E.P., Giegengask R.F. (1997). BP and Oasis impact structures, Libya, and their relation to libyan desert glass: petrography, geochemistry, and geochronology . LPI Contrib. , No.922, P. 145-147
  12. Abate Begosew, Koeberl Christian, Kruger Johan F., Underwood James R.(Jr) (1999). BP and Oasis impact structures, Libya, and their relation to Libyan Desert Glass . Spec. Pap., No.339, P. 177-192
  13. Jarmo Moilanen (2004). References.
  14. Osinski Gordon R. (2006). The geological record of meteorite impacts. 40th ESLAB First International Conference on Impact Cratering in the Solar System, 8-12 May 2006., Noordwijk,The Netherlands
  15. Norbert Brugge (2004). Remarks to the origin of the craters around Gilf Kebir and Djebel Uweinat (Egypt) and the supposed impact craters of Libya. Dipl.- Geol.


Google Earth.


:

, . :
1) (18 ) ..S. (2 ), , <120 . ;
2) -1 (6,8 ) -2 (10 ), ,< 140 . .
(- .., 2007).


( " "):

- . . , . . , . . {87}Sr/{}86Sr {143}Nd/{144}Nd . .
(Abate Begosew, Koeberl Christian, Kruger Johan F., Underwood James R.(Jr), 1999).


BP structure

The BP structure is located in southeastern Libya, 165km northeast of the Kufra Oasis and about 80km from the Oasis impact structure. BP is 2.8 km in diameter and occurs in the Cretaceous Nubian sandstone. BP consists of two discontinuous rings of hills, with a central structure in the middle. BP has experienced heavy erosion, to such an extent that the southern half of the central uplift block has been eroded to the level of the crater bottom. The rings of hills do not get any higher than 30m, and the inner ring is more structurally deformed than the outer ring. The central block has a diameter of 0.6km, and a maximum relief of 38m. Bedding within this central block is intensely JOINTED , so that true bedding is extremely difficult to identify.
The proximity of the BP structure to the Oasis structure has led to the suggestion that the two craters formed at the same time during a double impact event. Also lending to this idea are the similar levels of erosion at both craters, which are both very highly eroded, and both are present in Nubian sandstone.
Shock metamorphism is abundant in the Nubian sandstones at the BP structure. The most diagnostic features are open fractures and planar deformation features, which are quite abundant. Planar deformation fractures are present but poorly developed, which probably suggests low peak shock pressures. Shock lamellae are extremely well developed, with as many as nine distinct sets occurring in one quartz grain. These features are extremely similar, if not identical, to the shock metamorphic features found at the Oasis structure.
The BP structure, and the Oasis structure, has been suggested as the source of the Libyan Desert Glass (EXAMPLE ) The Libyan Desert Glass has been thought of as an impact glass, but there were no craters identified in the area at the time of this theory. The formation of BP and Oasis could account for the formation of an impact melt. More recent studies have attempted to link these craters to the Libyan Desert Glass by geochemical analyses.
Compositional similarities between rocks from these craters and the Libyan Desert Glass have led to a tentative conclusion that the glass and the craters are connected. However, the uniformity of the local rocks makes it difficult to establish an undeniable link.
The age of the BP structure is difficult to constrain, since there is no impact melt. The age of the Nubian sandstone is late Cretaceous, so the time of the impact event can be limited to between now and ~100 million years ago.
Global Impact Studies Project




, " " - , . , , .
, , . , " " " ", , . FAQ .

Bourabai Research Institution home page

   - Bourabai Research Bourabai Research Institution