Baratoux David auteur aut IRD Bouley S. auteur aut IRD Reimold W. U. auteur aut IRD Baratoux Lenka auteur aut IRD text journalArticle eng text/pdf born digital access Shatter cones are curved fractures decorated with divergent striations that are exclusively associated with impact metamorphism. The terminology "cone" was chosen from the observation of complete or near-complete, roundish, axisymmetric objects with a well-defined apex/apical area. It also imprecisely extends to the curved or subplanar fractures decorated with striations commonly observed at impact sites. The geometry of these objects is therefore highly variable but its significance was never addressed due to the lack of appropriate data. Here, we apply two methods to derive shape models of shatter cones. The first one is based on images acquired using a commercial camera and may be applied on large samples in the field. The second one uses an articulated arm equipped with a digital laser scanner and produces high-resolution and precision shape models of hand-sized samples. The analysis of 20 shape models of shatter cones from nine different impact sites indicates that the surface of shatter cones may be described by quadric surfaces and are generally consistent with hyperboloids, whereas occurrence of paraboloid objects cannot be ruled out. The surface characteristics are generally not consistent with the mathematical definition of a cone. The value of these shape models to discriminate between the different hypotheses of formation of shatter is still limited, as it remains to be resolved which type of surface pertains to which hypothesis. This requires theoretical developments, and experimental or numerical simulations of the propagation of tensile fractures associated with shock waves. specialized 064 020 Baratoux David coord. edt IRD Reimold W. U. coord. edt IRD 51 8 (No spécial) 1460-1476 2016 1086-9379 https://www.documentation.ird.fr/hor/fdi:010068669 10.1111/maps.12610 1086-9379 [F B010068669] https://www.documentation.ird.fr/hor/fdi:010068669 https://www.documentation.ird.fr/intranet/publi/2016/12/010068669.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2017-01-09 2024-05-03 fdi:010068669 fre