Microchemical investigation of small-scale pseudotachylitic breccias from the Archean gneiss of the Vredefort Dome, South Africa

A microchemical investigation of pseudotachylitic breccias from the Vredefort Dome, South Africa, reveals that these melt breccias likely formed through a combination of shock compression and decompression melting rather than solely through shearing or intrusion. The study analyzed small- to meso-scale breccias in polished granite slabs, providing detailed geometric and microchemical data previously lacking in research on this 2.02-billion-year-old impact structure. By integrating microdeformation studies with chemical analysis, the researchers aimed to resolve longstanding debates about the genesis of these breccias, offering new insights into the complex processes involved in impact-induced melting.

Mohr-Westheide, T., & Reimold, W. U. (2010). Microchemical investigation of small-scale pseudotachylitic breccias from the Archean gneiss of the Vredefort Dome, South Africa. Large Meteorite Impacts and Planetary Evolution IV. https://doi.org/10.1130/2010.2465(30)