Post by 1dave on Jan 5, 2019 16:12:35 GMT -5
www.impact-structures.com/impact-rocks-impactites/
“Impact rocks” and “impactites”, which can be considered synonymous, are informal, somewhat woolly terms.
Fig. 1. Simple classification of impactites guided rather by geologic requirements than by a mineralogically and petrologically dominated nomenclature of the IUGS. Shock effects are not considered because they don’t provide any reasonable criteria for a distinction. It is emphasized that a clear distinction is first of all a matter of scale and – concomitantly – transitions of all kinds may exist. Also see the text.
“Impact rocks” and “impactites”, which can be considered synonymous, are informal, somewhat woolly terms.
On our websites we have already early pointed to the largely inconsistent and geologically often dubious definitions presented by this IUGS impact study group. Meanwhile, the members of the IUGS impact subgroup have become a little bit more insightful having eliminated many of the mistakes (see for example die IUGS web version 01.02.07 [D. Stöffler & R.A.F. Grieve] to be clicked HERE). However, even the in part new classifications are furthermore all but cogent and frequently lack all intrinsic logics. This will be shown here by a few examples.
Fig. 1. Simple classification of impactites guided rather by geologic requirements than by a mineralogically and petrologically dominated nomenclature of the IUGS. Shock effects are not considered because they don’t provide any reasonable criteria for a distinction. It is emphasized that a clear distinction is first of all a matter of scale and – concomitantly – transitions of all kinds may exist. Also see the text.
