RK Awl-O'Gist wrote:GG wrote:barakat is not an amatuer after all
Let's not get carried away; Barakat only gets a namecheck for leading them to the chunks of glass. At no point does it describe his CV, and he played no part in actually formulating this theory.
The various ideas about the origin of Libyan Desert Glass (LDG) discussed in the BBC article have been around for years and discussed by various people in numerous papers. A few of the numerous published papers discussing LDG are:
Abate, B., C. Koeberl, J. R. Underwood, Jr., W. U. Reimold, P.
Buchanan, E. P. Fisk, and R. F. Giegengack, 1997, BP and
OASIS Impact Structures, Libya: Preliminary petrographic and
Geochemical Studies and Relation to Libyan Desert Glass. The
28th Lunar and Planetary Science Conference, Houston, Texas,
March 17-21, 1997. NASA Johnson Space Center (JSC)
Abate, B, C. Koeberl, F. J. Kruger, and J. R. Underwood, Jr.,
1999, BP and Oasis impact structures, Libya, and their relation
to Libyan desert glass. In Large meteorite impacts and planetary
evolution; II, B. O. Dressler and V. L. Sharpton, eds., pp. 177-
192. Special Paper no. 339, Geological Society of America,
Boulder, CO,
Barrat, J. A., B. M. Jahn, J. Mosse, R. Rocchia, F. Keller, G.
R. Poupeau, and E. Diemer, 1997, Geochemistry and origin of
Libyan Desert glasses. Geochimica et Cosmochimica Acta.
vol. 61, no. 9, pp. 1953-1959.
Clayton, P. A., and L. J. Spencer, 1934, Silica Glasses from
the Libyan Desert. Minerological Magazine. vol. 23, pp. 501-508.
Kleinmann, B., P. Horn, and F. Langenhorst, 2001, Evidence
for shock metamorphism in sandstones from the Libyan desert
glass strewn field. Meteoritics & Planetary Science. vol. 36,
no. 9, pp. 1277-1282.
Koeberl, C., 1985, Trace elements chemistry of the Libyan
Desert Glass. Meteoritics. vol. 20, p. 686.
Murali, A. V., E. J. Linstrom, M. E. Zolensky, J. R. Underwood,
and R. F. Giegenback, 1989, Evidence of extraterrestrial
component in the Libyan Desert Glass. EOS Transactions.
vol. 70, p. 1178.
Murali, A. V., M. E. Zolensky, J. R. Underwood, and R. F.
Giengengack, 1990, Cometary signatures in the Libyan desert
glass. Eos, Transactions (American Geophysical Union)
vol. 71, no. 43, p. 1425.
Qureshi, A. A., and H. A. Khan, 1988, Recognition of meteoritic
impact by fission track dating (FTD) technique. Geological
Bulletin, University of Peshawar. vol. 21. pp. 49-56.
Rocchia, R., E. Robin, F. Froehlich, H. Meon, L. Froget, and E.
Diemer, 1996, L'origine des verres du desert libyque; un impact
meteoritique. [ Origin of Libyan desert glass; a meteoritic
impact.] Comptes Rendus de l'Academie des Sciences, Serie II.
Sciences de la Terre et des Planetes. vol. 322, no. 10,
pp. 839-845.
Schaaf, P., and D. Mueller-Sohnius, 2002, Strontium and
neodymium isotopic study of Libyan Desert Glass; inherited
Pan-African age signatures and new evidence for target
material. Meteoritics & Planetary Science. vol. 37,
no. 4, pp. 565-576
Wasson, J. T., and K. Moore, 1998, Possible formation of Libyan
Desert glass by a Tunguska-like aerial burst. Meteoritics and
Planetary Science. vol. 33, no. 4, Supplement pp. A163-A164.
Weeks, R. A., J. R. Underwood, and R. F. Giegenback, R. F.,
1984, Libyan Desert Glass: A review. Journal Noncrystalline
Solids. vol. 67, pp. 593-619.
Wright, G., 1999, The riddle of the sands New Scientist.
vol. 163, no. 2194, p. 42. (July 10, 1999).
Dr. Koeberl, Dr. Murali, and others have been publishing evidence for the extraterrestrial origin of LDG for over twenty years. The air burst hypothesis has been around since at least 1998, as indicated by Wassen and Moore (1998) and Wright (1999). The basic hypotheses mentioned in the BBC article have been under discussion for many years. The existence of LDG has been known since 1932.
Many of these ideas were discussed in the "Silica '96" conference held at the University of Bologna, Italy in 1996 and published in the "Proceedings of the Silica '96 Meeting, held at the University of Bologna on the 18th July 1996. This volume was edited by Dr. Vincenzo de Michele. Thus, he already knew about LDG before he examined the scarab in Tutankhamen's pectoral. The table of contents for "Silica 96" is at
http://fjexpeditions.com/resources/bibl/books/SG96.htm .
Also, Dr. de Michele, Dr. Barakat, and other geologists made joint expeditions, starting in 1994, to collect samples of LDG as reported in a paper, which they coauthored and was published in "Silica 96". Their "Silica 96" paper is:
Barakat, A. A., V. de Michele, G. Negro, B. Piacenza and
R. Serra, Some new data on the distribution of Libyan
Desert Glass (Great Sand Sea, Egypt) pp. 29-36.
The other papers coauthored by Dr. Barakat concerning LDG are:
Barakat, A. A., V. de Michele, D. Piacenza, S. Bonato, and
F. M. Bedewi, 1992, A short note on the geological field
trip to the Western Desert silica glass site. Annals of the
Geological Survey of Egypt. vol. 17, pp. 389-392.
and
Barakat, A. A., V. de Michele, G. Negro, and B. Piacenza, 1997,
A report on the 1994 field trip to the silica glass area, Great
Sand Sea, Western Desert. Annals of the Geological Survey of
Egypt. vol. 20, Part II, pp. 879-885.
The other articles, which I found so far in GEOREF and have Dr. Barakat as either an author or coauthor, are 1. "El Baz Crater; basaltic intrusion versus meteorite impact crater" (2001), 2. "Moessbauer study of El-Bahrain Meteorite" (2000), 3. "Meteoritic iron from the Libyan Glass area, southwestern Egypt" (1998), 4. "Is Isna Meteorite related to the fall of 1902?" (1993), and 5. "The desert of Great Sand Sea (GSS), Egypt; an interesting reservoir of meteorite finds" (1996).
Finally, according to the paper, which first formally noted that the scarab in Tutankhamen's pectoral is composed of Libyan Desert Glass, the person, who officially "discovered" this fact was Dr. de Michele. The paper is:
De Michele, V., 1998, The <<Libyan Desert Glass>> scarab
in Tutankhamen's pectoral. Sahara. no. 10, pp. 107-109.
Dr. Barakat's role in this research is discribed in the paper as:
“Aly A Barakat, geologist of EGSMA, obtained the necessary permit
for a non destructive analysis and, on the 17th October 1998, I
was able to carry out the gemological analysis of the scarab.”
Paul H.