1. Valter A.A, Gurov E.P. (1979) Meteorite structures on the planet surface. M.:Nauka, p.126-148 (in Russian)
  2. Masaitis V.L..(1980) The astroblem's geology. (in Russian)
  3. Feldman V.I. (1987) "The catalog of astroblems and meteorite craters of the Earth." Meteoritika. (in Russian) Issue 46, p. 154-171
  4. Alekseev A.S., etc. (1991) An estimation of the Earth's cosmic bomblet frequency, research into a possibility of their preliminary detection and change of trajectories // Report of SB AS USSR, Computer Center, Novosibirsk, 128p. (in Russian)
  5. Artemieva N.A. (2000). Bosumtwi crater ejecta - numerical simulations . The 31st International Geological Congress, Rio de Janeiro, Aug. 6-17, 2000, Rio de Janeiro: Geol. Surv. Braz., P. 6417
  6. Jones W.B. (1985). The origin of the Bosumtwi Crater, Ghana - an historical review . Proc. Geol. Assoc. , Vol.96, No.3, P. 275-284
  7. Graham, Bevan and Hutchison (1985). Catalogue of Meteorites. 4th Edition
  8. Grieve R.A.F. (1987). Terrestrial impact structures. Ann.Rev.Earth Planet.Sci., Vol.15, p. 245-270
  9. (1988). Astronauts guide to terrestrial impact craters.. Space Shuttle Earth Observation Project, Lunar and Planetary Institute (March 1988).
  10. Glass B.P. (1988). Montagnais impact crater: possible source of the North American tektite strewn field . Lunar and Planet. Sci. - Vol. 19: Abstr. Pap. 19th Lunar and Planet. Sci. Conf., March 14-18, 1988 , Houston (Tex.), P. 391-392
  11. Koeberl Christian, Bottomley Richard J., Glass Billy P., Storzer Dieter, York Derek (1989). Geochemistry and age of Ivory Coast tektites. Abstr. and Program 52nd Annu. Meet. Meteorit. Soc., Vienna, July 31 - Aug. 4, Houston (Tex.), P. 115
  12. Glass B.P. (1990). The Ivory Coast microtektite strewn field . Meteoritics, Vol.25, No.4, P. 366
  13. Koeberl Christian (1992). Tektine origin by hypervelocity asteroidal or cometaryimpact: the quest for the source craters . Pap. Present. Int. Conf. Large Meteorite Impacts and Planet. Evol., Sudbury, Aug. 31 - Sept. 2, 1992 , Houston (Tex.), P. 43
  14. Storzer D. (1992). Microtektite hunting and mineral wool shot . Lunar and Planet. Sci. Vol. 23. Abstr. Pap. 23rd Lunar and Planet. Sci. Conf., March 16-20, 1992. Pt 4, Houston (Tex.), P. 13-73
  15. Hodge, Paul W., (1994). Meteorite craters and impact structures of the Earth. Cambridge University Press , 122 ÒÒ.
  16. Ahulu S.T. (1997). Overview of Bosumtwi crater, Ghana . LPI Contrib., No.922, P. 48-49
  17. Koeberl Christian, Reimold Wolf Uwe, Blum Joel D., Chamberlain C.Page (1998). Petrology and geochemistry of target rocks from the Bosumtwi impact structure, Ghana, and comparison with Ivory Coast tektites . Geochim. et cosmochim. acta , Vol.62, No.12, 2179-2196
  18. Boamah D., Koeberl C. (1999). Shallow drilling around the Bosumtwi crater, Ghana: Preliminary results . Meteorit. and Planet. Sci. , Vol.34, No.4, P. 13-14
  19. Scholz Christopher A., Karp Tobias, Brooks Keely M., Milkereit Bernd, Amoako Philip Y.O., Arko Justice A. (2002). Pronounced central uplift identified in the Bosumtwi impact structure, Ghana, using multichannel seismic reflection data . Geology, Vol.30, No.10, P. 939-942
  20. Karp T., Artemieva N.A., Milkereit B. (2003). Seismic investigation and numerical modeling of the Lake Bosumtwi impact crater . LPI Contrib., No.1155, P. 42
  21. Pesonen Lauri J., Koeberl Christian, Hautaniemi Heikki (2003). Airborne geophysical survey of the Lake Bosumtwi meteorite impact structure (Southern Ghana) - geophysical maps with descriptions . Jahrb. Geol. Bundesanst., Vol.143, No.4, P. 581-604
  22. Jarmo Moilanen (2004). References.
  23. Koeberl Christian, Reimold Wolf U. (2005). Bosumtwi impact crater, Ghana (West Africa): an updated and revised geological map, with explanations . Jahrb. Geol. Bundesanst, Vol.145, No.1, P. 31-70
  24. 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
  25. Ferriere L., Koeberl C., Reimold W. U. (2006). SHOCK-METAMORPHIC EFFECTS IN SAMPLES FROM CORE LB-08A: FIRST MATERIAL RECOVERED FROM THE CENTRAL UPLIFT OF THE BOSUMTWI IMPACT CRATER, GHANA
  26. Boamah D., Koeberl C. (2006). THE LAKE BOSUMTWI IMPACT STRUCTURE IN GHANA: ENVIRONMENTAL ASSESSMENT AND POTENTIAL FOR ECOTOURISM
  27. Berndt J., Deutsch A., Luethe S. (2006). GLASSY FALL BACK PARTICLES FROM THE LAKE BOSUMTWI IMPACT STRUCTURE, GHANA
  28. Coney L., Ferriere L., Koeberl C., Milkereit B., Reimold W. U. (2006). FIRST RESULTS FROM THE 2004 ICDP BOSUMTWI IMPACT CRATER, GHANA, DRILLING PROJECT: IMPACT AND GEOPHYSICAL ASPECTS.
  29. L. CONEY, L. FERRIERE, W.U. REIMOLD, C. KOEBERL AND R.L. GIBSON (2007). Geochemical characterisics of the LB-07A and LB-08A cores from the Bosumtwi Impact Structure, Ghana. (Goldschmidt Conference Abstracts 2007)
  30. S. LUETKE, A. DEUTSCH AND B.P. GLASS (2007). Ivory Coast tektites, microtektites and glassy fallback particles of the Lake Bosumtwi impact crater, Ghana: Geochemical differences. (Goldschmidt Conference Abstracts 2007)
  31. Other references from RJ.

The Bosumtwi crater is a 10.5km diameter crater located 30km south of Kumasi in Ghana. Although the center of the crater is completely filled by Lake Bosumtwi, the crater is assumed to be complex. Bosumtwi is located in a tropical region that is dominated by rainforests, which has made the area hard to study. In addition, the hot and humid climate often causes rocks to erode quickly, possibly erasing signs of impact. Despite these obstacles, intensive investigations of Bosumtwi crater have occurred in recent years, and have provided some interesting data about this crater.

Bosumtwi appears to have several structural features common to impact craters. Bosumtwi is transected by several radial fractures and faults, which are common at impact craters. The outer rim has outer and inner slopes, both of which are steeply dipping. Outward-thrusting faults are common in the crater. Several symmetric close and isoclinal folds were identified, and seem to have formed during crater formation.

The different kinds of rocks present at Bosumtwi also provide evidence for an impact origin. Deposits of suevite were found to the north and southwest of the crater. Breccia deposits were also found, but they have not been linked to an impact origin. It has been suggested that some of the breccia was created during the impact, and some is the result of mass wasting and erosional processes of the local rocks. Planar deformation features were found in clasts within the suevite, but not in any other rocks. However, the target rocks do show signs of significant fracturing.

Bosumtwi crater has been linked through chemical analysis to the Ivory Coast tektite field. While the similarity in ages between these two objects (Bosumtwi is 1.07 million years old, the Ivory Coast tektite field is 0.7-1.3 million years old) suggests a link, more compelling evidence is needed. It has also been noted that the amount of tektites increases the closer one gets to Bosumtwi crater. Chemical analysis of the Ivory Coast tektites has shown that they have many similarities with 2 billion year old crustal Archean rocks in Africa; these are the kinds of rocks that Bosumtwi crater formed in. Further study has shown that the tektites and rocks from Bosumtwi are have similar enough compositions to consider Bosumtwi to be a source of the tektites. Global Impact Studies Project


Location map with ICDP boreholes. (Coney L., Ferriere L., Koeberl C., Milkereit B., Reimold W. U., 2007, "FIRST...")



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