Baratoux David, Reimold W. U. (2016). The current state of knowledge about shatter cones : introduction to the special issue. In :
Baratoux David (coord.), Reimold W. U. (coord.). Shatter cones : nature and genesis. Meteoritics and Planetary Science, 51 (8 (No spécial)), p. 1389-1434. ISSN 1086-9379.
Titre du document
The current state of knowledge about shatter cones : introduction to the special issue
Baratoux David (coord.), Reimold W. U. (coord.) Shatter cones : nature and genesis
Source
Meteoritics and Planetary Science, 2016,
51 (8 (No spécial)), p. 1389-1434 ISSN 1086-9379
Shatter cones are a fracture phenomenon that is exclusively associated with shock metamorphism and has also been produced in the laboratory in several shock experiments. The occurrence of shatter cones is the only accepted meso-to macroscopic recognition criterion for impact structures. Shatter cones exhibit a number of geometric characteristics (orientation, apical angles, striation angles, sizes) that can be best described as varied, from case to case. Possible links between geometric properties with impact or crater parameters have remained controversial and the lack of understanding of the mechanism of formation of shatter cones does not offer a physical framework to discuss or understand them. A database of shatter cone occurrences has been produced for this introduction paper to the special issue of Meteoritics and Planetary Science on shatter cones. Distribution of shatter cones with respect to crater size and lithology suggests that shatter cones do not occur in impact craters less than a few kilometers in diameter, with a few, currently questionable exceptions. All pertinent hypotheses of formation are presented and discussed. Several may be discarded in light of the most recent observations. The branching fracture mechanism and the interference models proposed, respectively, by Sagy et al. (2002) and Baratoux and Melosh (2003) require further evaluation. New observations, experiments, or theoretical considerations presented in this special issue promise an important step forward, based on a renewed effort to resolve the enigmatic origin of these important features.
Plan de classement
Géologie et formations superficielles [064]
;
Géophysique interne [066]
