Impact Features
The impact nature is documented by abundant polymictic and monomictic breccias, breccia dikes, extensive megabreccias and impact ejecta, dislocated megablocks, geophysical anomalies and shock metamorphism. Shock effects like melt glass, diaplectic glass, planar deformation features (PDFs) are found in breccias and breccia dikes, and PDFs are abundant also in quartzite clasts contributing to the ejecta (Pelarda Formation).
Shock metamorphism in the Azuara impact structure include planar deformation features in quartz. The histogram displays frequencies of crystallographically controlled planes of microdeformation. The {1013} and {1012} occurrences are especially diagnostic and are generally considered as in proof of impact shock.
Read more about this topic: Azuara Impact Structure
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