Recognition of Meteoritic Impact by Fission Track Dating Technique
Abstract
Fission track dating (FTD) is a relatively new dating technique. By this, interesting problems concerning rock dating, flight and fall of ‘mysterious’ glass objects-the tektites and meteorites can be studied and solved. This paper describes the general details of the FTD technique and the age determination work carried out on Libyan desert glass. Based on these studies a meteoritic impact, which caused the fusion of Nubian sand or sandstone and resulted in the formation of Libyan desert glass 28.36 m.y. ago, has been recognized.
References
Bames, V.E. & Banms, M.A., 1973. Tektites, World wide investigations of tektites continued. Eds. Dowdens Hutch. inson and Ross, Stmudsburg. Lapidary J. 26, 18-21.
Bames, V.K. & Underwood, J.R., Jr., 1976. New investigations of the strewn field of Libyan desert glass and its petrography. Earth Planet. Sci. Lett. 30, 117-122.
Carpenter, B.S. & Reimer, G.M., 1974. Calibrated glass standards for fission track use. MBS, Special Publ. NO. 260-249.
Durrani, S.A. & Bull, R.K., 1987. Solid state nuclear track detection, principles, methods & applications. Pegamon Press, Oxford.
Fleischer, R.L., Price, P.B. & Walker, R.M., 1975. Nuclear tracks in solids: Principles & applications. University of California Press, Berkeley.
El Goresy, A., 1965. Baddeleyite and its significance in impact glasses. J. Geophys. Res. 70, 3453-3459.
El Goresy, A., 1968. The opaque minerals in impact glasses. In Shock Metamorphism of Natural Material. (B.M. French & N.M. Short eds.) 531-534.
Jones, M.P., 1987. Applied Mineralogy. Alden press, Oxford, U.K.
Kleinmann, B., 1969. The breakdown of zircon observed in the Libyan desert glass as evidence of impact origin, Earth Planet. Sci. Lett. 5, 497-501.
Spenser, L.J., 1939. Tektites and silica glass. Min. Mag. 25, 425-428.