Titre du document / Document title
A TEM investigation of shock metamorphism in quartz from the Vredefort dome, South Africa
Auteur(s) / Author(s)
LEROUX H. (1) ;
REIMOLD W. U. ;
DOUKHAN J.-C. (1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Univ. sci. technologies Lille, lab. structure propriétés état solide, Villeneuve d'Ascq 59655, FRANCE
Résumé / Abstract
The origin of the Vredefort structure in South Africa is still debated. Several causes have been discussed, namely asteroid impact, internal gas explosion or tectonic processes. Evidence of dynamic rock deformation is pervasive in the form of planar features in quartz grains, shatter cones, veins of pseudotachylite and occurrence of coesite and stishovite (high-pressure quartz polymorphs). A number of these characteristics is widely believed to support an impact origin. However, the planar features in quartz, which are generally considered as one of the strongest indicators of impact, are in the Vredefort case considered as anomalous when compared with those from accepted impact structures
Revue / Journal Title
Tectonophysics
ISSN
0040-1951
CODEN TCTOAM
Source / Source
1994, vol. 230, n
o3-4, pp. 223-239 (1 p. 1/4)
Langue / Language
Anglais
Revue : Multilingue
Editeur / Publisher
Elsevier, Amsterdam, PAYS-BAS
(1964)
(Revue)
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Localisation / Location
INIST-CNRS, Cote INIST : 12207, 35400002566553.0070
Nº notice refdoc (ud4) : 3953780
