Static recrystallization of shocked calcite in Ries impact breccias
Abstract
Abstract Calcite is prone to chemical and microstructural modifications, especially after having been strained at high stresses and strain rates, as during hypervelocity impact events. These modifications include precipitation from pore fluid as well as replacement of strained volumes by recrystallization. In calcite aggregates of a metagranite breccia of the Ries Bunte Breccia, shocked calcite is partly replaced by new, undeformed grains. This breccia indicates shock conditions of 10–20 GPa by the presence of planar deformation features in quartz of the metagranite. Shocked calcite shows grain orientation spread (GOS) angles of 3–10° and contains e ‐, f ‐, and r ‐ twins, as well as a ‐ and f ‐type lamellae. In contrast, the new coarse calcite grains, which are hundreds of μm in diameter, have low GOS angles (
Fields of Study & Subjects
High-pressure geophysics and materials
High-Velocity Impact and Material Behavior
Energetic Materials and Combustion
Publication details
- Journal / source
- Meteoritics and Planetary Science
- Publisher
- Wiley
- Volume
- 61
- Issue
- 7
- Pages
- 1456–1473
- Publication date
- 10 February 2026
- Language
- EN