Geophysical characterization of the Daskop granophyre dyke and surrounding host rocks, Vredefort impact structure, South Africa

A geophysical study of the Daskop granophyre dyke (DGD) at the Vredefort impact structure reveals that it is currently at its lowest termination depth, either due to erosion or a fundamental process in impact cratering. Magnetic and resistivity surveys showed limited subsurface volume and shallow penetration (<3 m), suggesting the DGD's current position may not be an erosional coincidence but could reflect broader structural dynamics within large impact craters. This finding challenges assumptions about the emplacement history of granophyre dykes, which are remnants of impact melt sheets, and underscores the need for further investigation to determine if other similar dykes share this characteristic.

Fourie, F. D., Huber, M. S., & Kovaleva, E. (2019). Geophysical characterization of the Daskop granophyre dyke and surrounding host rocks, Vredefort impact structure, South Africa. Meteoritics & Planetary Science, 54(7), 1579–1593. Portico. https://doi.org/10.1111/maps.13300